Pepper T A, Boyd H W
Vet Rec. 1977 Sep 3;101(10):177-80. doi: 10.1136/vr.101.10.177.
Analyses of breeding records and herd efficiency factors are important for veterinary surgeons supervising reproductive efficiency and piglet performance in breeding herds. These data include: the number of litters produced per sow per year; the distribution of weaning to service intervals; the number of sows returning to service by 30, 60, 90 and 120 days; the percentage of sows farrowing to first service; the percentage of sows found to be not pregnant; and the percentage of sows aborting. Boar performance data, piglet mortality percentages, piglet growth rates, feed efficiency factors and the percentage of sows culled from the herd are also analysed. A computer program was developed to produce these and other data from simple breeding records.
分析繁殖记录和猪群效率因素对于监督繁殖猪群繁殖效率和仔猪性能的兽医来说很重要。这些数据包括：每头母猪每年产仔窝数；断奶至配种间隔的分布情况；30、60、90和120天时返情母猪的数量；配种后第一胎分娩的母猪百分比；未怀孕母猪的百分比；以及流产母猪的百分比。公猪性能数据、仔猪死亡率百分比、仔猪生长率、饲料效率因素以及从猪群中淘汰的母猪百分比也会进行分析。开发了一个计算机程序，用于从简单的繁殖记录中生成这些及其他数据。
