Animal Genetics and Breeding Unit, University of New England, Armidale, NSW, 2350, Australia.
Animal. 2011 Dec;5(12):1855-67. doi: 10.1017/S1751731111001133.
Data on sow body weight (BW) and fatness (n = ~2250 pregnant sows) and reproductive data (including historical: n = ~18 000) were used to examine the genetic and phenotypic associations between body condition before and after farrowing, gestational outcomes, lactation feed intake and the gilts' ability to survive unculled to farrow in the second parity. Within-trait genetic correlations were very high between weight (0.77 ± 0.06) and fat depth (0.91 ± 0.04) recorded before farrowing and at weaning. Litter size traits were generally uncorrelated genetically with aspects of sow BW and body condition. However, genetic correlations indicated that sows producing heavier piglets at birth had litters with increased gain (0.36 ± 0.16), and were characterised by greater weight (-0.72 ± 0.08) and fat change (-0.19 ± 0.15) during lactation, reflected to a lesser extent by lower weight (-0.12 ± 0.11) and fatness (-0.17 ± 0.10) at weaning. Genetic correlations (r(a)) between reproductive traits and lactation feed intake were generally low, but favourable. However, lactation intake was positively correlated with measures of sow size (r(a) = ~0.55), such that selection for lactation feed intake would likely be accompanied by increased mature sow size. Phenotypic correlations (r(p)) showed that sow survival to the second parity (FAR12) was positively influenced by litter size and fat depth at weaning, supporting attributes of increased fatness before farrowing, less weight loss during lactation and an increased lactation intake.
数据来自大约 2250 头怀孕母猪的体重（BW）和体况（n = ~2250）以及繁殖数据（包括历史数据：n = ~18000），用于检查分娩前后体况、妊娠结果、泌乳采食量以及后备母猪在第二胎中未经淘汰存活的能力之间的遗传和表型关联。分娩前和断奶时记录的体重（0.77 ± 0.06）和脂肪深度（0.91 ± 0.04）之间的个体内遗传相关性非常高。窝产仔数性状通常与母猪 BW 和体况的各个方面没有遗传相关性。然而，遗传相关性表明，出生时产仔较重的母猪，其产仔在哺乳期的增重（0.36 ± 0.16）增加，并且在哺乳期的体重（-0.72 ± 0.08）和脂肪变化（-0.19 ± 0.15）更大，断奶时体重（-0.12 ± 0.11）和体况（-0.17 ± 0.10）的变化程度较低。繁殖性状和泌乳采食量之间的遗传相关性（r(a)）通常较低，但有利。然而，泌乳采食量与母猪体型（r(a) = ~0.55）呈正相关，因此选择泌乳采食量可能伴随着母猪体型的增加。表型相关性（r(p)）表明，母猪在第二胎的存活率（FAR12）受到断奶时窝产仔数和脂肪深度的正向影响，这支持了在分娩前增加体脂、减少哺乳期体重损失和增加泌乳采食量的属性。
