| Autor: |
Bricarello, P A, Zaros, L G, Coutinho, L L, Rocha, R A, Kooyman, F N J, De Vries, E, Gonçalves, J R S, Lima, L G, Pires, A V, Amarante, A F T |
| Přispěvatelé: |
LS Klinisch Onderzoek Wagenaar, LS Virologie, I&I AVM |
| Jazyk: |
angličtina |
| Rok vydání: |
2007 |
| Předmět: |
|
| Popis: |
The present study evaluated Nelore cattle with different degrees of resistance to natural infections by gastrointestinal nematodes. One hundred weaned male cattle, 11-12 months of age, were kept on the same pasture and evaluated from October 2003 to February 2004. Faecal and blood samples were collected for parasitological, haematological and immunological tests. In February 2004, the 10 most resistant and the 10 most susceptible animals were selected based on individual means of nematode faecal egg counts (FEC). Such animals were slaughtered for worm burden determination and nematode species identification. The repeatability estimates for FEC (+/-S.D.), log-transformed FEC and packed-cell volume (PCV) in all animals were 0.3 (+/-0.05), 0.26 (+/-0.04) and 0.42 (+/-0.05), respectively. The resistant group showed lower FEC and worm burdens than the susceptible group (P0.05). The resistant group showed higher total serum IgE levels (P |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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