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Avian Pathology
Weisman, Y., Division of Avian Diseases, The Kimron Veterinary Institute, P.O.B. 12, Bet Dagan 50250, Israel, Agricultural Research Organization, Department of Poultry Science, The Volcani Center, P.O.B. 6, Bet Dagan 50250, Israel
Bartov, I., Agricultural Research Organization, Department of Poultry Science, The Volcani Center, P.O.B. 6, Bet Dagan 50250, Israel
A case of monensin toxicity in laying hens is reported. The drug was incorporated, by error, at a concentration of 800 mg/kg in the rations which were fed for 4 days to light (Leghorn ×Rhode Island Red, LR) and heavy (White Rock, WR) breeds of laying hens. Egg production (initial levels of about 80% and 57%, in the LR and WR hens, respectively) decreased markedly 24 h after feeding the monensin-supple-mented rations, and 8 days later it was less than 10% in the LR hens and had stopped completely in the WR birds. Egg production in both strains regained normal levels 30 days from the beginning of the episode. Mortality started 48 h after monensin administration, reaching a peak on the 9th and 6th days in the LR and WR hens, respectively. Mortality was much higher in the WR hens (38.3%) than in the LR hens (3.7% in shed A and 8.3% in shed B). It seems, therefore, that the WR hens were more susceptible to monensin toxicity than LR hens. © 1994, Taylor & Francis Group, LLC. All rights reserved.
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Monensin toxicity in two breeds of laying hens
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Weisman, Y., Division of Avian Diseases, The Kimron Veterinary Institute, P.O.B. 12, Bet Dagan 50250, Israel, Agricultural Research Organization, Department of Poultry Science, The Volcani Center, P.O.B. 6, Bet Dagan 50250, Israel
Bartov, I., Agricultural Research Organization, Department of Poultry Science, The Volcani Center, P.O.B. 6, Bet Dagan 50250, Israel
Monensin toxicity in two breeds of laying hens
A case of monensin toxicity in laying hens is reported. The drug was incorporated, by error, at a concentration of 800 mg/kg in the rations which were fed for 4 days to light (Leghorn ×Rhode Island Red, LR) and heavy (White Rock, WR) breeds of laying hens. Egg production (initial levels of about 80% and 57%, in the LR and WR hens, respectively) decreased markedly 24 h after feeding the monensin-supple-mented rations, and 8 days later it was less than 10% in the LR hens and had stopped completely in the WR birds. Egg production in both strains regained normal levels 30 days from the beginning of the episode. Mortality started 48 h after monensin administration, reaching a peak on the 9th and 6th days in the LR and WR hens, respectively. Mortality was much higher in the WR hens (38.3%) than in the LR hens (3.7% in shed A and 8.3% in shed B). It seems, therefore, that the WR hens were more susceptible to monensin toxicity than LR hens. © 1994, Taylor & Francis Group, LLC. All rights reserved.
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