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首页> 外文期刊>Tropical Animal Health and Production >Effect of protein supplementation on reproductive and productive performance in Bos indicus c Bos taurus heifers raised in the humid tropics of Costa Rica
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Effect of protein supplementation on reproductive and productive performance in Bos indicus c Bos taurus heifers raised in the humid tropics of Costa Rica

机译：补充蛋白质对哥斯达黎加潮湿热带地区种植的Bos indicus c Bos taurus小母牛的生殖和生产性能的影响

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摘要

In order to evaluate the effect of protein supplementation on the productive and reproductive performance of heifers, 45 Bos indicus c Bos taurus heifers, 673pl146 days of age and weighing about 340 kg, were divided into two groups. The control group (n=23) continued without supplementation, but the supplemented group (SG; n=22) received concentrate at a rate of 1% BW kg per day. Animals were adapted to the concentrate over a 15-day period and then supplemented for 30 days, after which estrus was synchronized using a progesterone implant. Back fat thickness (BFT) was assessed by ultrasound. The SG had better average daily weight gain than the nonsupplemented group (0.63pl0.16 vs. 0.51pl0.13 kg/day, P<0.05) and tended to show a better percentage ovulation (P<0.10, 77% vs. 57%, respectively). However, this tendency was not reflected in the final pregnancy rates. No differences were observed between groups in dry matter intake and body condition scores. SG with a high BFT (>0.70 cm) showed a better ovulation percentage than those with low BFT (<0.69 cm; P<0.01). Additionally, the pregnancy rate of supplemented heifers with high BFT tended to be better than heifers with low BFT in this same group (67% vs. 30%, respectively, P<0.10). It is concluded that protein supplementation improved reproductive performance and that ultrasonography to measure BFT may be used to estimate reproductive performance.
机译：为了评估蛋白质补充对小母牛生产和生殖性能的影响，将45头673pl146日龄，重约340公斤的Bos indicus c Bos taurus小母牛分为两组。对照组（n = 23）继续不补充，但补充组（SG; n = 22）每天以1％BW kg的速度接受浓缩。在15天的时间内使动物适应浓缩液，然后补充30天，之后使用孕酮植入物使发情同步。背部脂肪厚度（BFT）通过超声评估。 SG的平均日增重比不补充组的平均日增重更好（0.63pl0.16比0.51pl0.13 kg /天，P <0.05），并且倾向于表现出更好的排卵百分比（P <0.10，77％比57％） ， 分别）。但是，这种趋势并未反映在最终妊娠率中。两组之间在干物质摄入量和身体状况评分上没有差异。高BFT（> 0.70 cm）的SG排卵百分比比低BFT（<0.69 cm; P <0.01）的更好。此外，在同一组中，补充高BFT的小母牛的妊娠率往往好于低BFT的小母牛（分别为67％和30％，P <0.10）。结论是蛋白质补充改善了生殖性能，超声测量BFT可用于估计生殖性能。

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