Calf presence and estrous response, ovarian follicular activity and the pattern of luteinizing hormone in postpartum Bos indicus cows.

Content Provider	Europe PMC
Author	Xavier, Eduardo Gularte Galina, Carlos Salvador Pimentel, Claudio Alves Rechsteiner, Sandra Fiala Maquivar, Martin
Abstract	The main objective of the present experiment was to assess the effect of temporary weaning on the onset of estrus, ovarian follicular activity and secretion of luteinizing hormone in Bos indicus cows. Forty six mature cows were divided into three groups 1) calves were weaned for 72 h allowing auditory, olfactory and visual contact with their dams (VISUAL, n = 17), 2) calves without contact with their dams for 72 h (NC, n = 17) and 3) calves not weaned and in constant contact with their dams (CTRL, n = 12). Estrus was synchronized in all cows using CIDR for 9 days plus 2 mg of estradiol benzoate given at CIDR insertion. The VISUAL group had a greater (P < 0.05) proportion of cows in estrus (76.5%) compared to the CTRL group (16.7%), but no differences were found when compared to the NC group (58.8%). The VISUAL group had a greater proportion of animal that ovulated (76.5%) compared to CTRL (33.3%) and NC groups (64.7%; P = 0.059). Duration of estrus was shorter (P = 0.04) in the VISUAL (8.4 ± 4.4 hours) than in the NC (12.9 ± 13.4 hours) however, CTRL treatment (11 ± 1.4 hours) was not different from either of these two groups. LH concentration after implant removal was similar among treatments and started to increase at 36 h post CIDR removal. Only in the CTRL group was there an obvious increase by 54 h after implant removal. Follicular size increased in diameter from 36 h and were evident in treatments and control groups by 60 h (P < 0.05). The VISUAL treatment increased the number of cows ovulating and shortened the length of estrus. VISUAL and NC groups showed a similar response in follicular growth and pattern of circulating LH because of treatment.
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ISSN	18069614
Journal	Animal Reproduction [Anim Reprod]
Volume Number	15
PubMed Central reference number	PMC8203114
Issue Number	4
PubMed reference number	34221134
e-ISSN	19843143
DOI	10.21451/1984-3143-ar2017-0049
Language	English
Publisher	Colégio Brasileiro de Reprodução Animal
Publisher Date	2018-12-05
Access Restriction	Open
Rights License	This is an Open Access article under the Creative Commons Attribution License (CC BY 4.0 license) Copyright © The Author(s). Published by CBRA.
Subject Keyword	Bos indicus LH postpartum temporary weaning
Content Type	Text
Resource Type	Article
Subject	Veterinary Animal Science and Zoology