Patterson J L, Smit M N, Novak S, Wellen A P, Foxcroft G R
Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada.
Reprod Fertil Dev. 2011;23(7):889-98. doi: 10.1071/RD11015.
The effects of feed restriction (60% of anticipated feed intake; Restrict; n=60) during the last week of a 21-day lactation in primiparous sows compared with feeding at 90% of anticipated feed intake (Control; n=60) on sow metabolic state, litter growth and sow reproductive performance after weaning were compared. Metabolisable energy (ME) derived from feed was lower, ME derived from body tissues was higher and litter growth rate was reduced (all P<0.05) in Restrict sows during the last week of lactation. Treatment did not affect weaning-to-oestrus interval, pregnancy rate, ovulation rate, embryonic survival or the number of live embryos (P>0.05) at Day 30 of gestation: However, embryo weight was greater (P<0.05) in Control than in Restrict sows (1.55±0.04vs 1.44±0.04g, respectively). These data suggest the biology of the commercial sow has changed and reproductive performance of contemporary primiparous sows is increasingly resistant to the negative effects of lactational catabolism. Overall, catabolism negatively affected litter weaning weight and embryonic development of the next litter, but the extent to which individual sows used tissue mobilisation to support these litter outcomes was highly variable.
将初产母猪21天泌乳期最后一周的采食限制（预期采食量的60%；限制组；n = 60）与按预期采食量的90%饲喂（对照组；n = 60）相比较，研究其对母猪代谢状态、仔猪生长以及断奶后母猪繁殖性能的影响。在泌乳期最后一周，限制组母猪来自饲料的可代谢能量（ME）较低，来自体组织的ME较高，仔猪生长速率降低（所有P<0.05）。处理对断奶至发情间隔、妊娠率、排卵率、胚胎存活率或妊娠第30天的活胚胎数无影响（P>0.05）：然而，对照组母猪的胚胎重量高于限制组（P<0.05）（分别为1.55±0.04克和1.44±0.04克）。这些数据表明，现代商业母猪的生物学特性已发生变化，当代初产母猪的繁殖性能对泌乳期分解代谢的负面影响越来越具有抵抗力。总体而言，分解代谢对仔猪断奶体重和下一窝仔猪的胚胎发育有负面影响，但个体母猪利用组织动员来支持这些仔猪生长结果的程度差异很大。
