Effects of body condition and supplementation on ovarian function, growth factors and response to estrus synchronization in postpartum beef cows in Tamaulipas, Mexico

IF 0.8 4区农林科学 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Acta Agriculturae Scandinavica Section A-Animal Science Pub Date : 2018-07-03 DOI:10.1080/09064702.2019.1648546

M. Domínguez-Muñoz, José Armando Guerra-Puga, Hossana Guadalupe Berrones-Morales, R. López-Zavala, J. Salinas-Chavira

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Abstract

ABSTRACT Eighteen beef cows with their calves were assigned to 3 groups considering body conditions scores at calving (BCSC): T1 (high BCSC, maintained throughout the study); T2 (low BCSC, increased during the study); and T3 (low BCSC, maintained throughout). An estrus synchronization protocol was implemented, with fixed time artificial insemination on day 70. Follicular or luteal growth, and pregnancy rate were similar between groups. Of all cows, five showed multiple ovulations (2–6); increasing number of ovulations reduced preovulatory follicle diameter and individual luteal volume (P < 0.05), but total luteal volume was greater in cows with 2 or 3 ovulations on day 14 after insemination (P < 0.05). Estradiol and progesterone levels were associated to follicular and luteal growth, respectively. No difference was found in IGF1 or GDF9 levels between groups or associated to fertility. No association was found between BCS, IGF1 or GDF9 levels and the reproductive process.

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体况及添加量对墨西哥塔毛利帕斯州产后肉牛卵巢功能、生长因子及对发情同步反应的影响

根据产犊体况评分(BCSC)将18头肉牛及其犊牛分为3组:T1(高BCSC，在整个研究过程中保持);T2(低BCSC，研究期间升高);T3(低BCSC，始终维持)。采用同步发情方案，在第70天进行固定时间人工授精。两组间卵泡或黄体生长、妊娠率相似。在所有奶牛中，有5头出现多次排卵(2-6);排卵次数的增加降低了排卵前卵泡直径和个体黄体体积(P < 0.05)，但总黄体体积在受精后第14天排卵2次和3次的奶牛中较大(P < 0.05)。雌二醇和黄体酮水平分别与卵泡和黄体生长有关。各组间IGF1或GDF9水平没有差异，也与生育能力无关。BCS、IGF1和GDF9水平与生殖过程没有关联。

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来源期刊

Acta Agriculturae Scandinavica Section A-Animal Science 农林科学-奶制品与动物科学

CiteScore

2.30

自引率

0.00%

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审稿时长

>36 weeks

期刊介绍： Acta Agriculturæ Scandinavica, Section A – Animal Science publishes results of original research in animal science and their applications related to the following topics: -Animal breeding and genetics -Molecular genetics -Animal physiology and reproduction -Nutrition and feeding -Animal behaviour and welfare -General animal husbandry and systems of production, including economic and technical aspects -Hygiene and quality of animal products In addition to original articles, covering basic as well as applied subjects, the journal features review articles and short communications. Acta Agriculturæ Scandinavica, Section A – Animal Science forms part of a trilogy of titles published on behalf of the Nordic Association of Agricultural Scientists (NJF). The series also includes Section B - Soil & Plant Science and the recently launched Section C - Food Economics . Acta Agriculturae Scandinavica A, B and C are available to purchase as a combined subscription. This provides access to all three journals in the series, and is available to institutional subscribers only. For full pricing information, please view the Taylor & Francis Journals Price List here. Scientists in research, teaching and extension with specialised interest in animal science and production.