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Culling in served females and farrowed sows at consecutive parities in Spanish pig herds

机译:连续淘汰西班牙猪群中的雌性和分娩母猪

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摘要

BackgroundThe objectives of our study were 1) to characterize culling and retention patterns in parities 0 to 6 in served females and farrowed sows in two herd groups, and 2) to quantify the factors associated with by-parity culling risks for both groups in commercial herds. Lifetime data from first-service to removal included 465,947 service records of 94,691 females served between 2008 and 2013 in 98 Spanish herds. Herds were categorized into two groups based on the upper 25th percentile of the herd means of annualized lifetime pigs weaned per sow: high-performing (> 24.7 pigs) and ordinary herds (≤ 24.7 pigs). Two-level log-binomial regression models were used to examine risk factors and relative risk ratios associated with by-parity culling risks.
机译:背景研究的目的是1)表征两组母猪和分娩母猪在0至6胎的同卵中的淘汰和保留模式,以及2)量化与商业牛群中的同等淘汰风险相关的因素。从首次服务到撤离的终生数据包括2008年至2013年之间在98个西班牙牛群中服务的94,691名女性的465,947条服务记录。根据每头母猪断奶的年平均一头生猪的平均上排第25个百分位数,将猪群分为两组:高性能猪(> 24.7头)和普通猪(≤24.7头)。使用两级对数二项式回归模型检查与奇偶校验剔除风险相关的风险因素和相对风险比率。

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