PONDERAL AND REPRODUCTIVE PERFORMANCE DURING RAIN SEASON OF NELLORE PRIMIPAROUS HEIFERS PREVIOUSLY SUPPLEMENTED WITH PROTEIN IN DRY SEASON

AbstractThe objective of this study was to evaluate, in rainy season, the effect of protein complementation during dry season on Nellore primiparous heifers. We used 39 primiparous heifers, with an average age of 24-36 months, reared on Brachiaria decumbens and Brachiaria Brizantha pasture, for 205days. The animals were weighed every 28 days, after fasting for 12 hours. The experimental design was a split plot, the two treatments were distributed in two installments, the six periods in subplots and the animals were the replications. The following variables were analyzed: weight, hip height, body condition score, average daily weight gain and average monthly growth, presenting the respective values of 318.5 kg, 142 cm, 3.24, 0.580 kg and 2.55 cm respectively for previously supplemented animals, and 309.6 kg, 141 cm, 3.23, 0.584 and 2.29 kg cm for non-supplemented animals. There were no significant differences between the two experimental groups. Pregnancy rate of supplemented animals was 57% and it did not differ from non-supplemented animals' rate (45%). Calving rate was 100% for both groups. In the rainy season, after supplementation, heifers that did not receive supplementation during the dry period of the previous year had similar reproductive and weight performance as the supplemented ones.

摘要
本研究旨在评估雨季条件下，旱季蛋白质补饲对内洛尔牛（Nellore）初产青年母牛的影响。试验选取39头平均年龄为24~36月龄的初产青年母牛，在臂形草（Brachiaria decumbens）与布里察臂形草（Brachiaria Brizantha）牧场上开展为期205天的饲养试验。每28天对试验动物实施12小时空腹称重。本试验采用裂区设计（split plot）：将两种处理方案设置为两个主区，六个时期作为副区，以个体动物作为重复单元。本研究分析的指标包括体重、体高、体况评分、平均日增重及月平均生长率，补饲组的对应指标分别为318.5 kg、142 cm、3.24、0.580 kg及2.55 cm，非补饲组的对应指标分别为309.6 kg、141 cm、3.23、0.584及2.29 kg·cm。两组试验动物间未观测到显著差异。补饲组的妊娠率为57%，与非补饲组的45%无显著差异；两组的产犊率均为100%。在雨季饲养阶段，经补饲后，上年旱季未接受补饲的青年母牛，其繁殖性能与生长性能均与补饲组无显著差异。