Influência do estresse térmico no desempenho reprodutivo de vacas leiteiras no período voluntário de espera / Influence of heat stress on reproductive performance of dairy cows during the volunteer waiting period

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

29/02/2012

RESUMO

The aim of this work was to evaluate the total antioxidant capacity in Holstein cows during the volunteer waiting period on two moments, dry season and raining season, to correlate with variables: glucose levels, Na, K, Ca, AST, ALT, triglycerides, cholesterol, open days and services per conception. Were analyzed 60 animals, subdivided on two groups, dry period (n=30) and raining period (n=30). The experiment began at the calve (d0) and finished 42 days postpartum (d42), and the evaluations were weekly (d0, d7, d14, d21, d28, d35 e d42). The dry period showed THI=72,3 and raining period showed THI=75,9. The respiratory rate was different between the seasons (p<0,001) and within periods (p<0,01). The rectal temperature wasnt between the seasons (p>0,05), but was different into the periods (p<0,05). The reproductive infections was presented in 56,6% (n=34), being 52,94% during the dry season and 47,05% during the raining season. There are different levels of glucose (p<0,05) between the seasons, less at the calve. The elements that were analyzed and showed more persistent variation was the cholesterol (P<0,05), AST (P<0,05), K (P<0,05) e Ca (P<0,05). The animals of the dry period had less open days (p<0,01) than the other group, but the services per conceptions werent significant (p>0,05). The Total antioxidant capacity (CAT) showed difference between raining season and dry season (p<0,05), with more elevated levels during the raining season. At the 42 day postpartum the animals with higher level of CAT had more open days than the others (r=0,37;p<0,05). The cows during the raining season appeared to be more stressed by the hot climate with more significant losses on the reproductive performance.

ASSUNTO(S)

pós-parto útero infecção patologia animal post-partum uterus infections

ACESSO AO ARTIGO

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