Reproductive behavior of Pantaneiros sheep, Mato Grosso do Sul, Brazil

Q3 Agricultural and Biological Sciences
C. Martins, Arnaldo Santiago Filho, M. B. Ferreira, C. Fernandes, A. C. D. Monreal, C. G. Souza, R. Chagas, F. M. V. Vargas Junior
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Abstract

The objective was to evaluate fertility, cyclicality behavior, and sexual performance of Pantaneiro sheep throughout the year’s photoperiods in Mato Grosso do Sul - Brazil. Two experiments were conducted. In experiment one, the ewes used aged between 2 and 4 years, distributed in three homogeneous groups of 54 animals and subjected to reproductive evaluation in three different predefined luminosity periods, consisting of autumn (11h 45 min.), spring (12h 30 min.), and summer (12h 55 min.). The characteristics studied were body weight (BW), body condition score (BCC), estrus distribution (EST), percentage of pregnant females per cycle (%P), plasma progesterone (PP), and fertility (F) in the three predefined seasons. The mating system used was controlled natural nocturnal and lasted for 45 days. Experiment two, evaluated the ram sexual activity. The males (10) were individually exposed to four ovariectomized ewes. The ewes cycled during evaluated seasons, and the highest fertility was observed in animals with BCC >2.75. The PP concentration differed among periods, and higher conception rates (F) were observed in autumn and spring. The rams (75%) had a medium  of sexual performance when they performed more than two ejaculations in 20 min throughout the seasons. Pantaneiro sheep of both genders had a similar fertility index, with early and constant activity throughout the year, displaying no photoperiodism or seasonality.
巴西南马托格罗索州Pantaneiros羊的繁殖行为
目的是评估巴西南马托格罗索州潘塔内罗羊在全年光照期的生育力、周期性行为和性表现。进行了两个实验。实验一选用2 ~ 4岁的母羊,均匀分为3组,每组54只,分别在秋季(11h 45 min)、春季(12h 30 min)和夏季(12h 55 min)三个不同的光照周期进行生殖评价。研究了三个季节的体重(BW)、体况评分(BCC)、发情分布(EST)、每周期妊娠率(%P)、血浆黄体酮(PP)和生育力(F)。采用自然夜间控制交配方式,持续45天。实验二,评估公羊的性行为。雄性(10只)分别暴露于4只去卵巢的母羊。母羊在评价季节循环,BCC >2.75的母羊产仔率最高。PP浓度在不同时期存在差异,秋季和春季受孕率(F)较高。公羊(75%)在整个季节中,当它们在20分钟内射精两次以上时,它们的性表现中等。Pantaneiro羊的雌雄繁殖指数相似,全年活动早且持续,不表现光周期或季节性。
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来源期刊
Acta Scientiarum. Animal Sciences
Acta Scientiarum. Animal Sciences Agricultural and Biological Sciences-Food Science
CiteScore
1.60
自引率
0.00%
发文量
45
审稿时长
9 weeks
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