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首页> 外文期刊>Journal of Animal Science >Effect of selection for residual feed intake on feeding behavior and daily feed intake patterns in Yorkshire swine1
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Effect of selection for residual feed intake on feeding behavior and daily feed intake patterns in Yorkshire swine1

机译：剩余采食量的选择对约克郡猪的采食行为和日采食方式的影响1

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Residual feed intake (RFI) is a measure of feed efficiency defined as the difference between observed and predicted feed intake based on average requirements for growth and maintenance. The objective of this study was to evaluate the effect of selection for decreased RFI on feeding behavior traits and to estimate their relationships with RFI. Three data sets from the 4th and 5th generations of a selection experiment with a line selected for reduced RFI (LRFI) and a randomly selected control line (CTRL) were analyzed. Lines were mixed in pens of 16 and evaluated for feeding behavior traits obtained from a single-space electronic feeder over a growing period of ∼3 mo before ∼115 kg. The following traits were evaluated as averages over the entire test period and over the first and second half of the test period: number of visits per day and hour; occupation time per day, visit, and hour; feed intake (Fl) per day, visit, and hour; and FI rate per visit. Models used included fixed effects of line and feeder, covariates of on-test age and FI per day, and random effects of pen, on-test group, sire, and litter. Repeated measures models were used to analyze feeding patterns during the day. The LRFI pigs had significantly less FI per day than CTRL pigs for all 3 data sets. With adjustment for FI per day, line differences of all traits were in the same direction for all 3 data sets but differed in significance and size. Feed intake per visit and hour and visits per day and hour did not differ between lines, but the tread was for LRFI pigs to have fewer visits, in particular during peak eating times. The LRFI pigs had a greater feeding rate and less occupation time per day, visit, and hour than CTRL pigs, but this was not significant for all data sets. Correlations of RFI with FI per day and visit and visits per day were positive. Average daily gain was positively correlated with FI per day and visit and occupation time per visit but negatively correlated with visits per day. Feed intake per day was positively correlated with backfat. In conclusion, feed efficiency may be affected by FI behavior because selection for decreased RFI has resulted in pigs that spend less time eating and eat faster. [PUBLICATION ABSTRACT]
机译：剩余饲料摄入量（RFI）是对饲料效率的一种度量，定义为根据生长和维持的平均需求，观察到的饲料摄入量与预测的饲料摄入量之间的差。这项研究的目的是评估选择降低RFI对进食行为特征的影响，并估计它们与RFI的关系。分析了来自第4代和第5代选择实验的三个数据集，其中选择了用于降低RFI的线（LRFI）和随机选择的控制线（CTRL）。将品系用16只钢笔混合，并评估在约115公斤的生长时间内约3个月内从单空间电子饲养器获得的饲养行为特征。在整个测试期间以及测试期间的前半部分和后半部分，将以下特征作为平均值进行评估：每天和每小时的访问次数；每天，每次访问和每小时的占用时间；每天，每次和每小时的采食量（Fl）；以及每次访问的FI费率。使用的模型包括生产线和饲养者的固定效应，每天测试的年龄和FI的协变量，以及笔，测试组，父亲和垫料的随机效应。重复测量模型用于分析白天的喂养方式。对于所有这三个数据集，LRFI猪每天的FI显着低于CTRL猪。通过每天调整FI，对于所有3个数据集，所有性状的品系差异都在同一方向上，但重要性和大小不同。每次访视和每小时采食量以及每天和每小时的采食量之间没有差异，但是LRFI猪的胎面采食量较少，尤其是在高峰采食时间。与CTRL猪相比，LRFI猪的饲喂率更高，每天，探视和小时的占用时间更少，但是对于所有数据集而言，这并不重要。每天的RFI与FI的相关性以及每天的访问和访问都是积极的。平均每日收益与每天FI，每次就诊和每次职业时间呈正相关，而与每天就诊呈负相关。每天的采食量与背脂呈正相关。总之，饲料效率可能受到FI行为的影响，因为降低RFI的选择导致猪的进食时间减少，进食速度加快。 [出版物摘要]

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