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Abstract：
This study aimed to characterize and quantify reasons for the removal of nurse sows and identify the removal associated with their extended lactation length (ELL). A total of 100,756 removed nurse sows within a period of 2016-2022 from 53 sow herds in the Midwest USA were analyzed. Reproductive failure was the most common removal reason (χ2 = 8748.421, p < 0.001) affecting P1, P2, and P3 nurse sows. Failure to conceive and absence of estrus were the main causes of reproductive failure (χ2 = 352.480, p < 0.001) affecting P1 and P2 nurse sows and P1 and P5 nurse sows, respectively. When P2 and P6 nurse sows had an ELL of 0-7 d, they faced a high chance (χ2 = 13.312, p = 0.021) of removal due to conception failure and failure to return to heat, respectively. When P2 and P5 nurse sows had an ELL of 8-14 d, they were highly vulnerable (χ2 = 59.847, p < 0.001) to removal due to failure to conceive and showing heat, respectively. Finally, when ELL was at 15-21 days, P4 and P5 nurse sows were more likely (χ2 = 41.751, p < 0.001) to be removed due to failure to express heat, whereas at the same time, P2 and P3 nurse sows experienced the same removal threat due to failing to conceive. These results could help producers manage nurse sow systems.
摘要：
这项研究旨在表征和量化去除哺乳母猪的原因，并确定与延长泌乳长度（ELL）相关的去除。在2016-2022年期间，从美国中西部的53头母猪群中总共分析了100,756头被移走的护士母猪。繁殖失败是影响P1，P2和P3母猪最常见的去除原因（χ2=8748.421，p<0.001）。受孕失败和无发情期是影响P1,P2母猪和P1,P5母猪繁殖失败的主要原因(χ2=352.480,p<0.001),分别。当P2和P6母猪的ELL为0-7d时，由于受孕失败和未能恢复热量，他们面临很高的机会（χ2=13.312，p=0.021），分别。当P2和P5母猪的ELL为8-14d时，由于未能受孕和表现出热量，他们极易被移除（χ2=59.847，p<0.001），分别。最后,当ELL在15-21天时，P4和P5哺乳母猪更有可能（χ2=41.751，p<0.001）由于无法表达热量而被移除，而同时,P2和P3母猪由于未能怀孕而经历了相同的去除威胁。这些结果可以帮助生产者管理护士母猪系统。
