Effect of protein and vitamin A intake of sheep on numbers of the sheep ked, Melophagus ovinus L |
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| Authors: | W A Nelson R Hironaka |
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| Affiliation: | 1. Department of Veterinary Parasitology, College of Veterinary Sciences and Animal Husbandry, Selesih, Aizawl, India;2. Department of Veterinary and Animal Husbandry Extension, College of Veterinary Sciences and Animal Husbandry, Selesih, Aizawl, India;3. Department of Livestock Production& Management, College of Veterinary Sciences and Animal Husbandry, Selesih, Aizawl, India;1. Laboratório de Endocrinologia e Metabologia Animal (LEMA), Universidade Federal de Santa Maria (UFSM), Av. Roraima 1000, Santa Maria, RS 97105-900, Brazil;2. Departamento de analises clínicas e toxicológicas, Universidade Federal de Santa Maria, Av. Roraima 1000, Santa Maria, RS 97105-900, Brazil;3. Grupo de Pesquisa e Extensão em Cadeias Produtivas do Pampa (PECPAMPA), Universidade Federal de Santa Maria (UFSM), Av. Roraima 1000, Santa Maria, RS 97105-900, Brazil;4. Laboratório de Bioquímica e Toxicologica, Universidade Federal de Santa Maria (UFSM), Av. Roraima 1000, Santa Maria, RS 97105-900, Brazil;2. Instituto de Investigaciones en Ciencias Veterinarias, Universidad Autonoma de Baja California, Mexicali, Baja California 21100, México;3. College of Animal Science, Jilin University, Changchun, China 130062;4. Department of Animal Science, University of California, Davis 95616 |
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| Abstract: | In two of five lambs on a 6% protein diet deficient in vitamin A the onset of acquired resistance to keds was inhibited, but not in five lambs on the same diet supplemented with vitamin A at the peak of ked numbers. In mature ewes on a 7.5% protein diet deficient in vitamin A the onset of acquired resistance was delayed so that peak numbers of keds were higher than on ewes on the same diet supplemented with vitamin A.In mature ewes on a 13.5% protein diet deficient in vitamin A for a prolonged period prior to infestation the onset of acquired resistance was not delayed, but the numbers of keds were from 3 to 4 times higher than on ewes on the same diet supplemented with vitamin A. A major factor contributing to these differences was the increase in mortality of keds on the supplemented group throughout the experiment. This increased mortality could not be related to the vascular or leucocytic changes of acquired resistance in the skin and, therefore, probably indicated a second type of resistance related to host nutrition. |
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