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首页> 外文期刊>Tropical Animal Health and Production >Effect of nutritional supplementation upon pregnancy rates of goats under semiarid rangelands and exposed to the male effect
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Effect of nutritional supplementation upon pregnancy rates of goats under semiarid rangelands and exposed to the male effect

机译：营养补充对半干旱牧场和暴露于雄性影响下山羊妊娠率的影响

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摘要

The aim of this study was to evaluate possible effects of improved protein and energy diet upon reproductive outcomes of adult goats under marginal rangeland grazing conditions and exposed to the male effect during the anoestrous-dry season. Adult goats (Nubian x Criollo, nonpregnant, nonlactating, n = 160, 22A degrees 50' N, 100A degrees 59' W, 1,653 m) were randomly divided in two experimental groups: Control (CG; n = 80) and Supplemented (SG; n = 80). Both CG and SG goats were kept together during the day for ranging a semiarid rangeland while separated accordingly at night. SG goats were individually supplemented [400 g kg(-1) day(-1) ; 14% CP and 2.92 Mcal DE kg(-1)] during a 30-day period. Thereafter, both the CG [35.5 A +/- 0.94 kg LW, 1.95 A +/- 0.06 U, body condition score (BCS)] and the SG [39.5 A +/- 0.94 kg LW, 2.29 A +/- 0.06 BCS] were exposed to adult males (Nubian, n = 4, two per group) of proven libido and fertility and kept together at night (1700-0900) during a 42-day experimental breeding period. At the beginning of the breeding period, both LW (P < 0.001) and BCS (P < 0.001) were higher in the SG, which was also reflected in higher pregnancy rate (92.5 vs. 76.3%, P < 0.01). Nonetheless, both CG and SG depicted an increased abortion rate (52.5 vs. 41.9% P > 0.05), respectively. Results suggest that nutritional supplementation and the male effect were able to successfully invoke neurophysiological pathways to increase ovarian activity and to promote a uterine milieu prone to the establishment of pregnancy during the anoestrus season. However, the increased abortion rates observed in the study occurred irrespective of the nutritional regime offered during the premating stage. Therefore, there is a need to align the last third of gestation to the onset of the grazing season in order to increase reproductive and economic efficiency in those rangeland-based marginal goat production systems.
机译：这项研究的目的是评估改良的蛋白质和能量饮食对边际牧场放牧条件下成年山羊生殖结局的影响，以及在厌食干燥季节暴露于雄性影响。将成年山羊（Nubian x Criollo，不怀孕，不哺乳，n = 160，22A度50'N，100A度59'W，1,653 m）随机分为两个实验组：对照（CG; n = 80）和补充（SG ; n = 80）。白天将CG和SG山羊放在一起，以进行半干旱牧场的耕作，并在晚上进行相应的隔离。单独补充SG山羊[400 g kg（-1）天（-1）;在30天内，CP为14％，Mcal DE kg（-1）为2.92]。之后，CG [35.5 A +/- 0.94 kg LW，2.25 A +/- 0.06 U，身体状况评分（BCS）]和SG [39.5 A +/- 0.94 kg LW，2.29 A +/- 0.06 BCS]暴露于成熟的性欲和繁殖力的成年雄性（努比亚人，n = 4，每组两个），并在42天的实验繁殖期内于夜间（1700-0900）保持在一起。在繁殖期开始时，SG的LW（P <0.001）和BCS（P <0.001）均较高，这也反映在较高的妊娠率上（92.5 vs. 76.3％，P <0.01）。尽管如此，CG和SG的流产率分别增加（52.5比41.9％P> 0.05）。结果表明，营养补充和雄性作用能够成功地激活神经生理学途径，以增加卵巢活性并促进易发情季节子宫形成的子宫环境。但是，研究中观察到的流产率增加，与早产阶段提供的营养方案无关。因此，有必要将妊娠的后三分之一与放牧季节的开始保持一致，以提高那些以牧场为基础的边缘山羊生产系统的繁殖和经济效率。

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