Selection for uterine capacity improves lifetime productivity of sows
Selection for uterine capacity improves lifetime productivity of sows
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DOI：
10.1016/j.anireprosci.2016.01.018
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发表时间：
2016-04-01
影响因子：
2.2
通讯作者：
Vallet, J. L.
中科院分区：
文献类型：
--
作者：
Freking, B. A.;Lents, C. A.;Vallet, J. L.
选择11代子宫容量（UC）的后备母猪产仔数比未选择的对照株系（CO）多1.6只，尽管平均排卵量少1只。本研究的目的是量化胎次相互作用，并表征各胎次母猪的产仔性能特征。小母猪每组产19窝，如果在这一组中成功交配，就会分成四胎。共对243窝和2639头仔猪进行了分析。拟合了分娩组、线、胎次（1-4）和涉及线的双向相互作用的固定效应。按随机效应拟合产组和品系母猪的父系数（n = 57）。没有观察到宇称相互作用的显著线。仔猪出生重、断奶前增重和断奶重均存在胎次效应（P < 0.01）。产仔数、平均窝重和总窝重、平均窝重和总窝重均存在胎次效应（P < 0.05）。产仔数选择系差异显著（P < 0.05），断奶数选择系差异显著（P = 0.06）。母猪群中母猪的保留率更高（P < 0.05）， UC系母猪的平均保留率为2.33胎，CO系母猪的平均保留率为1.87胎。这使得UC系列的累积终身生产力在总产仔数、活产仔数、窝产重、断奶仔数和窝产重方面都有良好的表现。(C) 2016年Elsevier B.V.出版
Selection for 11 generations for uterine capacity (UC) increased litter size in gilts by 1.6 more fully formed pigs at birth compared to an unselected control line (CO) despite averaging one less ovulation. The objective of the present study was to quantify line by parity interactions and characterize litter performance traits of sows in each line at later parities. Gilts farrowed in contemporary groups of 19 litters and were maintained through four parities if successfully mated in that contemporary group. A total of 243 litters and 2639 piglets were analyzed. Fixed effects of farrowing group, line, parity (1-4), and two-way interactions involving line were fitted. Sire (n = 57) of the sow within farrowing group and line was fitted as a random effect. No significant line by parity interactions were observed. Parity effects were detected (P < 0.01) for individual piglet birth weight, pre-weaning gain, and weaning weight. Parity effects were also detected (P < 0.05) for total number born, average and total litter birth weight, and average and total litter weaning weight. Selection line differences for litter traits were detected (P < 0.05) for number stillborn piglets and approached significance (P = 0.06) for number of piglets weaned. Retention of sows in the herd was greater (P < 0.05) with an average of 2.33 parities for the UC line females compared to 1.87 parities for the CO line. This resulted in favorable cumulative lifetime productivity of the UC line for total number of piglets born, number of piglets born alive, litter birth weight, number of piglets weaned and litter weaning weight. (C) 2016 Published by Elsevier B.V.