Reinício da atividade ovariana pós-parto de vacas Bos indicus em presença ou não do terneiro

Detalhes bibliográficos
Ano de defesa: 2007
Autor(a) principal: Xavier, Eduardo Gularte
Orientador(a): Pimentel, Cláudio Alves
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de Pelotas
Programa de Pós-Graduação: Programa de Pós-Graduação em Veterinária
Departamento: Veterinária
País: BR
Palavras-chave em Português:
Palavras-chave em Inglês:
Cow
Área do conhecimento CNPq:
Link de acesso: https://guaiaca.ufpel.edu.br/handle/123456789/2542
Resumo: The objective of this work was to test the effect of the presence or absence of the calf in the activities of estrous, follicular dynamics and hormone secretion of Bos indicus cows. Forty and six cows were divided in 3 groups. In group with contact (CC), the calves were prevented from suckling by being confined into a pen, that allowed auditory, olfactory and visual contact of the cows with their own calves (n=17). In group without contact (SC), the calves were weaned and prevented from any contact. In control group (T), the calves weren t weaned, remaining with their mothers (n=12). The CC group showed greater ratio of cows in estrous (76.5%) when compared to T (16.7%), but no difference from SC (64.7%). The CC group showed greater ratio of ovulation (76.5%) when compared to T (33.3%) and an apparent difference (p=0.06) when compared to SC (64.7%). The duration of estrous was lesser (p = 0.04) in group CC (8.4 h + 4.4 h) than the SC (12.9 + 13.4 h), however the group T (11 + 1.4 h) was not different from the others. The average interval between weaning and onset of estrus (35 + 6.3 h), weaning and end of estrus (44.4 + 5.4 h), intensity of estrus behavior (26.6 + 24 mounts), weaning and time of ovulation (70 + 12.7 h), onset of estrus and time of ovulation (33.3 + 9.3 h) and the end of estrus and time of ovulation (23.3 + 10.3 h) were not observed differences.The T group achieved 48 + 8.4 h of interval between weaning and the LH peak while in the weaned groups (CC and SC) the average interval was of 45.3 + 10.4 h, showing no differences between the CC group (42.5 + 8.2 h) and the SC (47.5 + 11.8 h). The interval between the peak of LH and the time of the ovulation presented a general average of 24.8 + 7.7 h, showing no differences between the groups T (25.5 + 5.7 h), CC (24.9 + 8 h) and SC (24.5 + 8.6 h). It was found that the contact between cow and calf during weaning was not different from that of the cows without any contact and there was no advantage in restricting contact between cow and calf. It was confirmed that weaning has a beneficial effect on the percentage of estrous and ovulation when compared to cows not weaned.