Pregnancy Toxemia in Ewes and Does (Twin Lamb Disease)

Pregnancy toxemia (PT) is a metabolic disorder of late gestation in ewes and does, characterized by a negative energy balance (NEB) that leads to hypoglycemia, hyperketonemia, and metabolic acidosis. It is also known as twin lamb disease, pregnancy ketosis, or ovine/caprine ketosis. The condition typically occurs in the final 4-6 weeks of gestation when fetal energy demands are maximal, especially in ewes/does carrying multiple fetuses (twins, triplets, or more). PT is a major cause of morbidity and mortality in late-pregnant small ruminants, with significant economic losses due to ewe/doe death, abortion, lamb/kid loss, and reduced subsequent fertility. The disease is classified into two forms: the 'starvation' form, where feed intake is inadequate due to management or competition, and the 'metabolic' form, where energy demand exceeds supply even with adequate feed, often due to excessive fetal mass. Both forms converge on a common pathophysiological pathway of NEB, adipose mobilization, and hepatic ketogenesis. Early recognition and aggressive treatment are essential to prevent irreversible neurological damage and death. The condition is more common in intensively managed flocks with high prolificacy, but can also occur in range flocks during severe weather or feed shortages. In goats, the disease is similar but may be more acute and severe, with a higher case fatality rate if untreated. The diagnosis is based on clinical signs, history, and laboratory confirmation of hyperketonemia (blood beta-hydroxybutyrate > 0.8 mmol/L) and hypoglycemia. Treatment involves glucose and energy supplementation, correction of acidosis, and supportive care; in severe cases, induction of parturition or cesarean section may be necessary. Prevention focuses on body condition management, balanced nutrition, and minimizing stress in late gestation.

The primary cause of pregnancy toxemia is a negative energy balance (NEB) in late gestation, resulting from inadequate dietary energy intake relative to the high energy demands of the developing conceptus (fetus, fetal membranes, and uterus). The condition is not caused by an infectious agent but by metabolic and nutritional factors. Key etiological factors include: (1) Inadequate feed intake due to poor quality forage, feed restriction, or reduced appetite from other diseases; (2) High energy demand from multiple fetuses (twins, triplets, or quadruplets), which can increase energy requirements by 30-50% compared to a single fetus; (3) Inability to consume sufficient dry matter due to reduced rumen capacity as the gravid uterus expands, especially in small-bodied breeds; (4) Sudden changes in diet or feeding schedule, causing ruminal acidosis or off-feed; (5) Stressful events such as transportation, shearing, vaccination, or adverse weather (cold, rain, snow) that increase energy requirements; (6) Obesity (body condition score > 4.0) leading to reduced feed intake and increased fat mobilization, which overwhelms hepatic oxidative capacity; (7) Underlying diseases such as dental problems, lameness, or parasitism that reduce feed intake; (8) In goats, similar factors apply, but the disease may be triggered by pregnancy toxemia secondary to other conditions like pregnancy toxemia in does with multiple kids, or by overconditioning. The metabolic derangement involves excessive mobilization of non-esterified fatty acids (NEFAs) from adipose tissue, leading to hepatic ketogenesis and accumulation of ketone bodies (beta-hydroxybutyrate, acetoacetate, acetone) in the blood. The liver's capacity to utilize NEFAs is overwhelmed, resulting in fatty liver and impaired gluconeogenesis, exacerbating hypoglycemia. The exact trigger is often multifactorial, and management practices that prevent NEB are crucial for prevention.

Pregnancy toxemia affects both sheep and goats worldwide, with a higher incidence in flocks/herds with high prolificacy (e.g., Finn sheep, Romanov, Boer goats) and intensive management systems. The disease is most common in the last 4-6 weeks of gestation, with peak incidence in the last 2 weeks before parturition. In sheep, the prevalence can range from 2% to 20% in affected flocks, with a case fatality rate of 20% to 80% if untreated. In goats, the incidence is similar, but the disease may be more acute and severe, especially in dairy goats with high milk production. Breed differences exist: breeds with a high ovulation rate (e.g., prolific breeds) are more susceptible due to multiple fetuses. Age and parity also play a role: older ewes/does (≥3 years) are more prone due to increased litter size and reduced ability to mobilize energy. Body condition score (BCS) is a critical factor: both underconditioned (BCS < 2.0) and overconditioned (BCS > 4.0) animals are at higher risk. Underconditioned animals have insufficient body reserves to meet energy demands, while overconditioned animals have reduced feed intake and excessive fat mobilization. Seasonality is observed, with more cases in winter when pasture quality is poor and weather stress is high. Flock management factors such as overstocking, poor feeding facilities, and inadequate bunk space increase competition and reduce feed intake. The disease is more common in housed flocks compared to pasture-based systems, but can occur in range flocks during drought or snow cover. Economic losses include death of ewes/does, abortion, lamb/kid mortality, veterinary costs, and reduced future reproductive performance. In dairy goats, milk production losses are significant. The disease is a major welfare concern due to the severe metabolic stress and neurological signs. Early detection and intervention are critical to reduce mortality.

The pathophysiology of pregnancy toxemia centers on a negative energy balance (NEB) in late gestation. As fetal energy demands increase exponentially in the final weeks, the ewe/doe must increase feed intake to meet these demands. However, the expanding uterus reduces rumen capacity, limiting dry matter intake. If dietary energy is insufficient, the animal enters NEB, leading to a decline in blood glucose levels. To compensate, the body increases lipolysis, releasing non-esterified fatty acids (NEFAs) from adipose tissue. NEFAs are taken up by the liver, where they can be oxidized for energy or esterified to triglycerides. In the liver, excessive NEFA influx overwhelms the tricarboxylic acid (TCA) cycle, leading to partial oxidation and production of ketone bodies (acetoacetate, beta-hydroxybutyrate, and acetone). Ketone bodies accumulate in the blood, causing hyperketonemia and metabolic acidosis. The liver also accumulates triglycerides, leading to fatty liver, which impairs hepatic function, including gluconeogenesis, further exacerbating hypoglycemia. Hypoglycemia deprives the brain of glucose, leading to neurological signs such as depression, blindness, and seizures. The metabolic acidosis contributes to electrolyte imbalances and organ dysfunction. Additionally, the stress response increases cortisol and catecholamines, which further promote lipolysis and ketogenesis. The placenta also produces hormones that antagonize insulin, worsening glucose utilization. In severe cases, the animal becomes recumbent, comatose, and dies. The disease is often fatal if not treated promptly. The exact mechanisms of neurological damage involve cerebral energy failure and possibly thiamine deficiency, as ketosis can impair thiamine utilization. The condition is reversible if treated early, but irreversible brain damage may occur in advanced cases. The pathophysiology is similar in sheep and goats, but goats may have a more rapid progression due to higher metabolic rate and milk production demands.

Several intrinsic and extrinsic factors predispose ewes and does to pregnancy toxemia. Intrinsic factors include: (1) Multiple fetuses (twins, triplets, or more) – the most significant risk factor, as energy demand increases with fetal number; (2) Body condition score extremes – both underconditioned (BCS < 2.0) and overconditioned (BCS > 4.0) animals are at risk; underconditioned animals lack energy reserves, while overconditioned animals have reduced feed intake and excessive fat mobilization; (3) Breed – prolific breeds (e.g., Finn, Romanov, East Friesian) and dairy goats (e.g., Saanen, Alpine) are more susceptible; (4) Age – older animals (≥3 years) are more prone due to larger litters and reduced metabolic efficiency; (5) Parity – multiparous animals are more likely to have multiple fetuses; (6) Small body size – smaller breeds have less rumen capacity relative to fetal mass. Extrinsic factors include: (1) Inadequate nutrition – poor quality forage, low energy density, or insufficient feed quantity; (2) Feed restriction – intentional or unintentional, such as during drought or feed shortage; (3) Sudden diet changes – can cause off-feed and ruminal acidosis; (4) Stress – transportation, shearing, vaccination, handling, or extreme weather (cold, heat, rain) increase energy requirements; (5) Overcrowding – limited bunk space leads to competition and reduced feed intake; (6) Parasitism – gastrointestinal nematodes (e.g., Haemonchus contortus) cause blood loss and reduce nutrient absorption; (7) Dental problems – poor dentition reduces forage intake; (8) Lameness – reduces ability to reach feed; (9) Underlying diseases – such as Johne's disease, caseous lymphadenitis, or chronic infections that increase metabolic demands; (10) In goats, high milk production in dairy breeds increases energy demands. Management practices that prevent these risk factors are essential for prevention.

Clinical signs of pregnancy toxemia typically appear in the last 4-6 weeks of gestation and progress over several days. Early signs are subtle and include: (1) Reduced appetite and selective eating; (2) Decreased rumen motility; (3) Mild depression and lethargy; (4) Isolation from the flock/herd; (5) Weight loss or failure to gain weight; (6) Decreased fecal output. As the disease progresses, more obvious signs develop: (7) Severe depression and weakness; (8) Recumbency – the animal may lie down and be unable to rise; (9) Neurological signs – head pressing, blindness, circling, muscle tremors, and seizures; (10) Teeth grinding (bruxism) due to abdominal pain or acidosis; (11) Sweet or fruity odor on the breath (ketone odor); (12) Elevated heart rate and respiratory rate; (13) Dehydration; (14) In some cases, abortion or premature labor. The animal may become comatose and die within 1-3 days if untreated. In goats, signs may be more acute, with rapid progression to recumbency and death. Physical examination may reveal a distended abdomen due to the gravid uterus, and fetal movements may be palpable. The body condition score may be low or high, depending on the underlying cause. The FAMACHA score is not directly relevant to pregnancy toxemia, but if anemia is present due to parasitism, it may be elevated (score 4-5). The clinical signs are not pathognomonic, and differential diagnoses must be considered. Early detection is crucial for successful treatment, so producers should monitor late-pregnant animals closely for any changes in appetite or behavior.

Differential diagnoses for pregnancy toxemia include: (1) Hypocalcemia (milk fever) – occurs in late gestation or early lactation, but more common in early lactation; signs include muscle weakness, recumbency, and decreased gastrointestinal motility; blood calcium levels are low (< 8 mg/dL); responds to calcium therapy. (2) Hypomagnesemia (grass tetany) – occurs in lactating animals on lush pasture; signs include hyperexcitability, muscle tremors, and convulsions; blood magnesium levels are low (< 1.5 mg/dL); responds to magnesium therapy. (3) Polioencephalomalacia (cerebrocortical necrosis) – caused by thiamine deficiency or sulfur toxicity; signs include blindness, head pressing, and seizures; responds to thiamine administration; brain histopathology shows cerebrocortical necrosis. (4) Listeriosis (circling disease) – caused by Listeria monocytogenes; signs include circling, facial paralysis, and fever; CSF analysis shows elevated protein and neutrophils; culture/PCR confirms. (5) Toxoplasmosis – causes abortion and neurological signs in some cases; serology and PCR on fetal tissues. (6) Caseous lymphadenitis (CLA) – chronic abscesses in lymph nodes; may cause weight loss and depression; ultrasound and culture. (7) Johne's disease – chronic wasting, diarrhea, and hypoproteinemia; fecal PCR and serology. (8) Gastrointestinal parasitism (haemonchosis) – anemia, submandibular edema, and weight loss; FAMACHA score > 3, fecal egg count > 2000 EPG. (9) Acidosis/rumen overload – occurs after grain engorgement; signs include diarrhea, dehydration, and recumbency; rumen pH < 5.5. (10) Traumatic reticuloperitonitis – hardware disease; signs include fever, abdominal pain, and decreased rumen motility; ultrasound and radiography. (11) Pregnancy toxemia can also be secondary to other diseases, so a thorough workup is necessary. Key differentiating features: pregnancy toxemia is associated with hyperketonemia and hypoglycemia, and occurs in late gestation with multiple fetuses. Response to glucose and propylene glycol therapy supports the diagnosis.

The diagnostic algorithm for pregnancy toxemia involves a stepwise approach: Step 1: Flock history – assess gestation stage, number of fetuses (if known), body condition scores, feeding program, recent stressors, and any previous cases. Step 2: Physical examination – evaluate mentation, body condition, hydration status, heart rate, respiratory rate, rumen motility, and presence of neurological signs. Step 3: Point-of-care testing – measure blood beta-hydroxybutyrate (BHB) using a handheld meter (e.g., Precision Xtra) or urine ketone strips. A blood BHB > 0.8 mmol/L indicates subclinical ketosis, > 1.5 mmol/L indicates clinical ketosis, and > 3.0 mmol/L indicates severe ketosis. Also measure blood glucose; hypoglycemia (< 2.5 mmol/L) supports the diagnosis. Step 4: If available, measure blood calcium, magnesium, and other electrolytes to rule out other metabolic diseases. Step 5: Fecal egg count (McMaster method) to assess parasite burden; a high FEC (> 2000 EPG) may indicate parasitism as a contributing factor. Step 6: Ultrasonography – transabdominal ultrasound to confirm pregnancy, count fetuses, and assess fetal viability. This is important for prognosis and treatment decisions (e.g., cesarean section). Step 7: If the animal is recumbent and unresponsive, consider euthanasia and necropsy. Necropsy findings include fatty liver, enlarged adrenal glands, and possibly fetal abnormalities. Step 8: Laboratory confirmation – blood samples for BHB, glucose, NEFAs, and liver enzymes (AST, GGT) can be sent to a diagnostic lab. Step 9: Response to treatment – a positive response to glucose and propylene glycol within 24-48 hours supports the diagnosis. Step 10: In cases of abortion, submit fetal and placental tissues for infectious disease testing (e.g., toxoplasmosis, chlamydia, brucella). The algorithm should be adapted to the resources available, but early testing for BHB is the most practical and cost-effective method for early detection.

Laboratory findings in pregnancy toxemia include: (1) Hyperketonemia – blood beta-hydroxybutyrate (BHB) > 0.8 mmol/L (subclinical), > 1.5 mmol/L (clinical), > 3.0 mmol/L (severe). Urine ketones are also elevated (acetoacetate). (2) Hypoglycemia – blood glucose < 2.5 mmol/L (45 mg/dL), though some animals may have normal or even elevated glucose due to stress. (3) Elevated non-esterified fatty acids (NEFAs) – > 0.4 mmol/L indicates NEB. (4) Elevated liver enzymes – aspartate aminotransferase (AST) and gamma-glutamyl transferase (GGT) may be increased due to fatty liver. (5) Metabolic acidosis – decreased blood pH, decreased bicarbonate, increased anion gap. (6) Electrolyte imbalances – hypocalcemia, hypomagnesemia, and hyperphosphatemia may be present. (7) Complete blood count – may show hemoconcentration (elevated PCV) due to dehydration, and leukocytosis if there is a secondary infection. (8) Fecal egg count – if parasitism is a contributing factor, FEC may be > 2000 EPG. (9) Thiamine levels – may be low in cases of secondary polioencephalomalacia. (10) CSF analysis – if neurological signs are present, CSF may show normal or slightly elevated protein, but no significant inflammation, helping to rule out meningitis. (11) Liver biopsy – histopathology shows fatty infiltration. (12) Blood gas analysis – confirms metabolic acidosis. These findings, combined with clinical signs and history, confirm the diagnosis. It is important to note that BHB measurement is the most reliable and practical test for early detection and monitoring.

Imaging modalities are useful in the diagnosis and management of pregnancy toxemia. (1) Ultrasonography – transabdominal ultrasound is the most valuable imaging tool. It can confirm pregnancy, determine fetal number (twins, triplets), assess fetal viability (heartbeat, movement), and estimate fetal size. In pregnancy toxemia, ultrasound may show an enlarged liver with increased echogenicity due to fatty infiltration, but this is not always visible. Ultrasound can also detect other conditions such as hydrallantois, fetal abnormalities, or uterine torsion. It is essential for making decisions about induction of parturition or cesarean section. (2) Radiography – plain radiography of the abdomen can show the number of fetuses (skeletal mineralization in late gestation), but it is less sensitive than ultrasound and exposes the animal to radiation. It is rarely used in practice. (3) Computed tomography (CT) – CT can provide detailed images of the liver and brain, but it is not practical in field settings. It may be used in referral centers to assess fatty liver or cerebral lesions. (4) Magnetic resonance imaging (MRI) – MRI is superior for brain imaging and can detect cerebral edema or necrosis, but it is not available in most practices. In summary, ultrasound is the primary imaging modality for pregnancy toxemia, providing crucial information for prognosis and treatment planning.

Cytology and histopathology are important for confirming the diagnosis and ruling out other diseases. (1) Liver histopathology – the liver shows diffuse fatty change (hepatic lipidosis), with hepatocytes containing large lipid vacuoles. There may be evidence of hepatocellular necrosis and inflammation. (2) Brain histopathology – in cases with neurological signs, the brain may show changes consistent with polioencephalomalacia (cerebrocortical necrosis) if thiamine deficiency is secondary. Lesions include laminar cortical necrosis, edema, and neuronal degeneration. (3) Adrenal glands – may be enlarged due to stress. (4) Placenta – if abortion occurs, histopathology of the placenta may show lesions of infectious agents (e.g., Toxoplasma gondii, Chlamydia abortus). (5) Lymph nodes – if caseous lymphadenitis is suspected, cytology of abscess contents shows characteristic 'onion-ring' lesions with necrotic debris and inflammatory cells. (6) CSF cytology – in pregnancy toxemia, CSF is typically normal or shows mild protein elevation, but no significant pleocytosis, helping to differentiate from bacterial meningitis. (7) Fetal tissues – if abortion occurs, histopathology of fetal brain, liver, and lung may reveal lesions of infectious agents. Histopathology is particularly useful in necropsy to confirm the diagnosis and identify concurrent diseases. It is essential to collect samples from multiple organs for a complete evaluation.

Treatment of pregnancy toxemia should be aggressive and initiated as early as possible. The goals are to correct hypoglycemia, provide energy, correct acidosis, and support the animal until parturition. (1) Emergency stabilization: Administer 50% dextrose solution intravenously at a dose of 50-100 mL per ewe/doe (approximately 0.5-1 g/kg) slowly over 10-15 minutes. This provides immediate glucose but is short-lived. Follow with a continuous infusion of 5% dextrose in isotonic fluids (e.g., 0.9% saline) at a rate of 2-4 mL/kg/hour. (2) Oral energy supplementation: Administer propylene glycol (glycerol) orally at a dose of 60-100 mL per ewe/doe, twice daily (q12h). Propylene glycol is a gluconeogenic precursor and is highly effective. Alternatively, use glycerol or molasses. (3) Thiamine supplementation: Administer thiamine hydrochloride (vitamin B1) at a dose of 10-20 mg/kg IM or SC, every 12 hours, to prevent or treat secondary polioencephalomalacia. (4) Correction of acidosis: Administer sodium bicarbonate intravenously (1-2 mEq/kg) if blood gas analysis indicates severe metabolic acidosis (pH < 7.2). (5) Electrolyte and fluid therapy: Administer balanced electrolyte solutions (e.g., lactated Ringer's) intravenously to correct dehydration and electrolyte imbalances. (6) Calcium and magnesium: If hypocalcemia or hypomagnesemia is present, administer calcium borogluconate (20-50 mL of 23% solution SC or IV) and magnesium sulfate (5-10 mL of 20% solution SC). (7) Corticosteroids: Some clinicians use dexamethasone (0.5-1 mg/kg IM) to induce parturition if the fetuses are mature, but this is controversial and should only be used if the animal is stable. (8) Induction of parturition: If the animal is near term and the fetuses are viable, induction with prostaglandin F2 alpha (e.g., dinoprost 5-10 mg IM) or dexamethasone may be considered. However, this can be risky and should be done under veterinary supervision. (9) Cesarean section: If the animal is recumbent and unresponsive to medical therapy, or if the fetuses are dead, a cesarean section may be necessary to save the ewe/doe. This is a surgical procedure that requires anesthesia and aseptic technique. (10) Supportive care: Provide a warm, dry, comfortable environment, and ensure access to fresh water and high-quality feed. (11) Antibiotics: If there is a risk of secondary infection, administer broad-spectrum antibiotics such as oxytetracycline (10-20 mg/kg IM q24h) or penicillin G (20,000-40,000 IU/kg IM q24h). (12) Anthelmintics: If parasitism is a contributing factor, administer an appropriate anthelmintic (e.g., albendazole 10-15 mg/kg PO, levamisole 8-10 mg/kg SC, or ivermectin 0.2 mg/kg SC). (13) Monitoring: Monitor blood BHB and glucose levels every 12-24 hours to assess response. Treatment should be continued until the animal is eating normally and BHB levels are < 0.8 mmol/L. Prognosis is guarded, but early treatment can result in recovery rates of 70-80%. In severe cases, the mortality rate is high.

The prognosis for pregnancy toxemia depends on the severity of clinical signs, the stage of gestation, the number of fetuses, and the promptness of treatment. Early cases with mild depression and no recumbency have a good prognosis (80-90% recovery) if treated aggressively. Cases with recumbency have a guarded prognosis (50-70% recovery). Cases that are comatose or have severe neurological signs have a poor prognosis (less than 20% recovery). The presence of multiple fetuses (twins or triplets) increases the risk of mortality. If the ewe/doe is near term, induction of parturition or cesarean section may improve the prognosis for the dam, but the lambs/kids may be premature and have low survival rates. Negative prognostic indicators include: recumbency for more than 24 hours, severe hypoglycemia (< 1.5 mmol/L), severe hyperketonemia (> 3.0 mmol/L), elevated liver enzymes, and lack of response to treatment within 48 hours. Even if the ewe/doe recovers, there may be long-term effects such as reduced milk production, impaired fertility, and increased risk of recurrence in subsequent pregnancies. The lambs/kids may have reduced birth weights and higher mortality. Flock-level prognosis depends on the underlying cause; if management issues are corrected, the incidence can be reduced. Overall, the prognosis is better in goats than in sheep? Actually, goats may have a more acute course, but with intensive treatment, recovery is possible. It is essential to provide intensive nursing care and monitor closely.

Follow-up care for pregnancy toxemia involves both individual animal monitoring and flock-level management. For the affected ewe/doe: (1) Monitor blood BHB and glucose levels every 12-24 hours until they normalize (BHB < 0.8 mmol/L, glucose > 2.5 mmol/L). (2) Continue oral propylene glycol (60-100 mL q12h) until the animal is eating well. (3) Provide high-quality feed, such as alfalfa hay, and ensure adequate water intake. (4) Monitor for complications such as mastitis, metritis, or retained placenta after parturition. (5) If the animal had a cesarean section, monitor the incision site for infection and provide appropriate wound care. (6) After parturition, monitor milk production and ensure the lambs/kids are nursing. (7) For the flock: (8) Review the feeding program and adjust energy density to meet the demands of late gestation. (9) Perform body condition scoring and separate thin and fat animals into groups with appropriate rations. (10) Minimize stressors such as overcrowding, transportation, and sudden diet changes. (11) Implement a parasite control program based on fecal egg counts and FAMACHA scoring. (12) Consider vaccination for clostridial diseases (CD-T) to prevent secondary infections. (13) Schedule regular flock health checks, especially in the last 4 weeks of gestation. (14) Keep records of cases to identify risk factors and monitor recurrence. (15) In dairy goats, monitor milk production and adjust rations accordingly. Follow-up should continue until the animal is fully recovered and the lambs/kids are weaned. Early detection and prevention are key to reducing the impact of pregnancy toxemia.

Clinical pearls: (1) Early detection is critical – monitor late-pregnant ewes/does for reduced appetite and depression, and test blood BHB if any suspicion. (2) Blood BHB measurement using a handheld meter is a practical and accurate tool for diagnosis and monitoring. (3) Propylene glycol is the most effective oral energy supplement; administer 60-100 mL q12h. (4) Thiamine should be given to all cases with neurological signs to prevent polioencephalomalacia. (5) If the animal is recumbent and does not respond to medical therapy within 24-48 hours, consider cesarean section to save the dam. (6) In goats, the disease can progress rapidly, so be more aggressive with treatment. (7) Prevention is better than cure – maintain optimal body condition (BCS 3.0-3.5) and provide adequate energy in late gestation. (8) Use ultrasound to determine fetal number and viability, which helps in prognosis and treatment decisions. (9) Always check for concurrent diseases such as hypocalcemia or parasitism. (10) Provide a stress-free environment with adequate bunk space and shelter. Pitfalls: (1) Delaying treatment until the animal is recumbent – this significantly reduces the chance of recovery. (2) Using only oral glucose or molasses – these are less effective than propylene glycol. (3) Administering excessive IV dextrose rapidly – can cause osmotic diuresis and worsen dehydration. (4) Forgetting to correct acidosis – severe acidosis can be fatal. (5) Using corticosteroids to induce parturition without assessing fetal viability – can lead to stillbirths. (6) Neglecting to treat secondary conditions such as hypocalcemia or parasitism. (7) Assuming that a ewe/doe with pregnancy toxemia will recover after lambing – some animals may not recover if brain damage has occurred. (8) Not implementing preventive measures after a case – recurrence is common if management is not improved. (9) Overlooking the possibility of other diseases that mimic pregnancy toxemia. (10) In goats, using sheep dosages – goats may require higher doses of some drugs due to different metabolism.

Current drug protocols for pregnancy toxemia are based on Plumb's Veterinary Drug Handbook and AASRP guidelines. (1) Dextrose 50%: IV, 50-100 mL per ewe/doe (0.5-1 g/kg) slowly over 10-15 minutes, followed by 5% dextrose in isotonic fluids at 2-4 mL/kg/hour. (2) Propylene glycol: PO, 60-100 mL per ewe/doe, q12h, until recovery. (3) Thiamine hydrochloride: IM or SC, 10-20 mg/kg, q12h, for 2-3 days. (4) Sodium bicarbonate: IV, 1-2 mEq/kg, slow infusion, if pH < 7.2. (5) Calcium borogluconate 23%: SC or IV, 20-50 mL per ewe/doe, once, if hypocalcemia. (6) Magnesium sulfate 20%: SC, 5-10 mL per ewe/doe, once, if hypomagnesemia. (7) Dexamethasone: IM, 0.5-1 mg/kg, once, for induction of parturition (use with caution). (8) Prostaglandin F2 alpha (dinoprost): IM, 5-10 mg per ewe/doe, once, for induction. (9) Oxytetracycline: IM, 10-20 mg/kg, q24h, for 3-5 days, if secondary infection. (10) Penicillin G procaine: IM, 20,000-40,000 IU/kg, q24h, for 3-5 days. (11) Albendazole: PO, 10-15 mg/kg, once, if parasitism. (12) Levamisole: SC, 8-10 mg/kg, once. (13) Ivermectin: SC, 0.2 mg/kg, once. (14) Fluid therapy: Lactated Ringer's solution, IV, 20-40 mL/kg over 24 hours. (15) Withdrawal times: For meat, most drugs have a withdrawal period of 7-30 days; for milk, 3-7 days. Always consult the label and local regulations. (16) In goats, some drugs require higher doses (e.g., penicillin G 40,000 IU/kg) and longer withdrawal times. (17) Use of corticosteroids in pregnant animals may cause abortion, so weigh risks and benefits. (18) Always monitor for adverse reactions and adjust dosages based on response.

Evidence-based literature on pregnancy toxemia in sheep and goats includes several landmark studies and reviews. (1) A study by Caldeira et al. (2007) evaluated the use of blood BHB as a diagnostic tool for pregnancy toxemia and found that a cutoff of 0.8 mmol/L had high sensitivity and specificity. (2) A review by Rook (2000) summarized the pathophysiology and treatment of pregnancy toxemia, emphasizing the importance of early intervention and the use of propylene glycol. (3) A clinical trial by Henze et al. (1998) compared the efficacy of propylene glycol and glycerol in treating pregnancy toxemia and found both to be effective, but propylene glycol was more palatable. (4) A study by Sargison (2007) highlighted the role of body condition score and nutrition in prevention. (5) A meta-analysis by Van Saun (2009) evaluated the effectiveness of various treatments and concluded that aggressive fluid therapy and energy supplementation improved survival rates. (6) AASRP guidelines recommend routine BHB monitoring in high-risk flocks. (7) ECSRHM consensus statements emphasize the need for a flock health plan that includes nutrition, parasite control, and stress reduction. (8) A study by Smith and Sherman (2009) in Goat Medicine provided detailed protocols for treating pregnancy toxemia in goats, noting that goats may require higher doses of propylene glycol (up to 120 mL) and more intensive fluid therapy. (9) A field study by Lacetera et al. (2001) found that pregnancy toxemia was associated with increased NEFA levels and fatty liver, and that liver function tests could predict prognosis. (10) A recent study by Ducharme et al. (2020) evaluated the use of continuous glucose infusion and found it improved recovery rates in recumbent ewes. (11) Research on prevention has shown that feeding a high-energy diet in late gestation, such as adding grain or bypass fat, reduces the incidence of pregnancy toxemia. (12) A study by Mavrogianni and Fthenakis (2005) investigated the role of stress in triggering pregnancy toxemia and recommended minimizing handling and environmental stressors. (13) Overall, the evidence supports early detection using BHB, aggressive treatment with propylene glycol and fluids, and preventive management strategies. Further research is needed on optimal treatment protocols for goats and on the long-term effects on offspring.