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首页> 外文期刊>Tropical Animal Health and Production >Impact of housing nursery pigs according to body weight on the onset of feed intake, aggressive behavior, and growth performance
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Impact of housing nursery pigs according to body weight on the onset of feed intake, aggressive behavior, and growth performance

机译：住房苗圃的影响根据体重对饲料摄入，激进行为和生长性能的重量

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Housing nursery pigs according to body weight is an observed common practice in production systems and, supposedly, improves growth performance and reduces body weight (BW) variation. This 42-day study evaluated the effects of housing nursery pigs according to BW on performance, onset of feed intake, and aggressive behavior. A total of 504 pigs were ranked by BW at weaning and categorized into three groups of 168 pigs each: light, medium, and heavy. Pigs were randomly distributed to unsorted pens (Unsorted) containing 6 pigs of each weight group and sorted pens with 18 pigs from just one group per pen (Sorted). From weaning to day 3, pigs were fed a diet containing 1% iron oxide dye and rectal swabs presenting red coloration were evaluated to assess feed intake onset. Eight pens were video recorded to evaluate aggressive behavior. Sorted-Heavy pigs delayed the onset of feed intake (P <= 0.011) and presented more aggressive behaviors than Sorted-Light and Sorted-Medium pigs (P <= 0.036). In Unsorted, onset of feed intake showed no differences between weight categories. Also, no differences were observed for aggressive behavior between Sorted and Unsorted. Final BW showed no differences between Sorted and Unsorted pigs. The within-pen weight coefficient variation (CV) was slightly different (P = 0.042) between Sorted and Unsorted pigs (13.3 and 15.6%, respectively), at the end of the study. Thus, sorting nursery pigs by BW did not improve growth performance and also, induce a lag of post-weaning feed intake onset and increased fights in Heavy pigs.
机译：住房养育猪根据体重是在生产系统中观察到的常见做法，并认为，提高了生长性能并降低了体重（BW）变异。今年42天的研究评估了根据BW的表现，进食摄入和侵略性行为的疗效。 BW在断奶中排名504猪，分为三组168猪，每组：光，中等和重。猪随机分布到含有每次重量组6个猪的未分布到未进行的笔（未侵蚀），并从每笔的一组中排序，含有18只猪（分选）。从断奶到第3天，猪喂养含有1％氧化铁染料的饮食，并评估呈现红色的直肠拭子以评估进料进口发作。八支钢笔是录制的视频，以评估积极的行为。分选重猪延迟进料摄入的发作（P <= 0.011），并呈现比分选光和分选培养基猪更具侵略性的行为（P <= 0.036）。在未缺陷的情况下，饲料摄入的发作显示在重量类别之间没有差异。此外，对于分类和未缺陷之间的攻击性行为没有观察到差异。最终BW在排序和未排序的猪之间没有差异。在研究结束时，笔在分选和未溺食的猪（分别为13.3和15.6％）之间的笔体重系数变化（CV）略微不同（p = 0.042）。因此，通过BW分拣幼儿园猪并未提高生长性能，并且还诱导断奶后饲料进口的滞后，并在重猪中增加斗争。

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