The influence of increased feeding on the susceptibility of sheep to infection with Haemonchus contortus
| Autor: | J.L. Duncan, S. Mitchell, D.S. Wallace, Michael J. Stear, M. Murray, G. Fishwick, P.H. Holmes, K. Bairden, Peter David Eckersall, J.J. Parkins, Quintin McKellar |
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| Rok vydání: | 1999 |
| Předmět: |
Red Cell
animal diseases 0402 animal and dairy science 04 agricultural and veterinary sciences Anorexia Biology biology.organism_classification 040201 dairy & animal science Parasitic infection Blood proteins Nematode Animal science Immunity parasitic diseases 040103 agronomy & agriculture medicine 0401 agriculture forestry and fisheries Animal Science and Zoology medicine.symptom Severe anaemia Haemonchus contortus |
| Zdroj: | Animal Science. 69:457-463 |
| ISSN: | 1748-748X 1357-7298 |
| DOI: | 10.1017/s1357729800051031 |
| Popis: | Previous research has shown that supplementing the diet of growing lambs with urea enhances their ability to withstand gastrointestinal infection with the nematode Haemonchus contortus. This study compared lambs given two different amounts (χ 1 and χ 1·5) of the same urea-supplemented diet. One dietary allowance was sufficient to allow uninfected lambs to gain approximately 400 g/week without adverse clinical signs. In contrast half of the H. contortus infected lambs on this dietary allowance had to be humanely killed before the end of the experiment due to severe anaemia and anorexia. All infected lambs on this dietary allowance showed decreased mean red cell volumes and decreased plasma albumin concentrations indicating inadequate replacement of red blood cells and plasma proteins lost during the infection. The remaining lambs were offered proportionately 0·5 more of the same dietary allowance. Among lambs on this dietary allowance, there were very few differences between uninfected and infected sheep in clinical signs and growth rate. Therefore, dietary allowances that are adequate for uninfected lambs are not necessarily sufficient for infected lambs. As nearly all grazing lambs are infected with nematodes, dietary recommendations should take parasitic infection and its nutritional demands into account. |
| Databáze: | OpenAIRE |
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