SOW CULLING AND MORTALITY IN COMMERCIAL SWINE BREEDING HERDS
SOW CULLING AND MORTALITY IN COMMERCIAL SWINE BREEDING HERDS
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DOI：
10.1016/0167-5877(90)90027-f
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发表时间：
1990-07-01
影响因子：
2.6
通讯作者：
MORRIS, RS
中科院分区：
文献类型：
--
作者：
STEIN, TE;DIJKHUIZEN, A;MORRIS, RS
使用18个商业猪育种PB群的6个月生产数据来描述特定原因的去除率以及每种去除原因的分娩和去除之间的时间损失量。在6个月的分析期间，有774名女性被移除。研究期间的清除率为25.0%，相当于年清除率为50%。四个主要原因组占所有移除的70%：生殖失败，退化问题，运动问题和死亡。除产次≥ 7外，在所有产次组中，生殖失败是最可能的去除原因，其中变性问题更可能，生殖失败排在第二位。在所有原因组中，从分娩到移除所需的平均时间为78天。生殖失败集中在> 10周，平均移除时间为128天。退行性问题的移除集中在第4-6周和>10周，平均移除时间为57天。死亡集中在第1周和>10周，平均移除时间为72天。运动问题集中在第5-8周，第二个高峰在>10周;平均移除时间为58天。大多数女性是非自愿被迁移的，随着替代率的增加，非自愿迁移的比例越来越高。
Six months of production data from 18 commercial swine breeding PBherds were used to describe reason-specific removal rates and the amount of time lost between farrowing and removal for each removal reason. There were 774 females removed during the 6-month analysis period. The removal rate for the study period was 25.0%, equivalent to an annual rate of 50%. Four major reason groups accounted for 70% of all removals: reproductive failure, degenerative problems, locomotor problems and death. Reproductive failure was the most likely removal reason across all parity groups except parity .gtoreq.7, in which degenerative problems were much more likely and reproductive failure ranked second. The average time required from farrowing to removal across all reason groups was 78 days. Reproductive failure clustered at > 10 weeks, with an average time to removal of 128 days. Removals for degenerative problems clustered at Weeks 4-6 and at >10 weeks, with an average time to removal of 57 days. Death clustered at Week 1 and at >10 weeks, with an average time to removal of 72 days. Locomotor problems clustered at Weeks 5-8, with a second peak at >10 weeks; the average time to removal was 58 days. Most females were removed involuntarily, and as the replacement rate increased a higher proportion of all removals were involuntary.