The present study was conducted to investigate effects of feed intake during late gestation on piglet birth weight and reproductive performance of sows. At d 90 of gestation (Gd90), a total of 397 Landrance × Large White gilts (parity 1) and sows (parities 2, 3, and 4) were randomly assigned to three groups according to feed intake, 2.8 kg/d (energy maintenance requirement for gilts and sows, 8.40 Mcal/d ME), 3.6 kg/d (10.26 Mcal/d ME), and 4.0 kg/d (11.40 Mcal/d ME), respectively. All gilts and sows were individually fed. Results indicate the increase in feed intake had no effect on birth weight and uniformity of piglet weight at parturition for sows with different backfat thickness (BF) at Gd90 or with different parities. Additionally, lactation body weight (BW) loss was greater (P < 0.05) in response to the greater feed intake during late gestation. Furthermore, there were no correlations between feed intake during late gestation and litter weight, average piglet birth weight, coefficient variation of within-litter birth weight (CVB), number of piglets with birth weight < 1.00 kg, and piglet weaning weight. In addition, the greater feed intake during late gestation led to a marked increase in reactive oxygen species and malondialdehyde (P < 0.05) and glutamine peroxidase tended to be less (P = 0.08) in plasma at parturition. In conclusion, the greater feed intake (exceeding energy requirement for maintenance) during late gestation had no effect on piglet birth weight or weaning weight, and led to greater oxidative stress at parturition and greater BW loss during lactation.

本研究旨在探讨妊娠后期采食饲料对仔猪出生体重和母猪生殖性能的影响。在妊娠第90天（Gd90），根据饲料摄入量2.8 kg / d（能量），将397头Landrance×大白小母猪（1胎）和母猪（2、3和4胎）随机分为三组。母猪和母猪的维护要求分别为8.40 Mcal / d ME，3.6 kg / d（10.26 Mcal / d ME）和4.0 kg / d（11.40 Mcal / d ME）。所有的小母猪和母猪都单独喂食。结果表明，对于Gd90或不同胎龄的不同背脂肪厚度（BF）的母猪，分娩时采食量的增加对分娩时的体重和仔猪体重的均匀性没有影响。此外，泌乳体重（BW）损失更大（P<0.05），以应对后期妊娠期间较高的采食量。此外，妊娠后期的采食量与窝产仔数，平均仔猪出生体重，窝内仔猪出生体重（CVB）的系数变化，出生体重<1.00 kg的仔猪数量和仔猪断奶体重之间没有相关性。此外，妊娠后期采食量增加导致活性氧和丙二醛含量显着增加（P <0.05），谷氨酰胺过氧化物酶趋于减少（P = 0.08）在分娩时血浆中。总之，妊娠后期较高的采食量（超过维持所需的能量）对仔猪的出生体重或断奶体重没有影响，并且导致分娩时的氧化应激更大，泌乳期的BW损失更大。