2Zhang R F, Hu Q, Li P F, et al. Effects of lysine intake during middle to late gestation (day 30 to 110) on reproductive perfor- mance, colostrum composition, blood metabolites and hormones of multiparous sows[J]. Asian-Aust J Anita Sci, 2011, 24(8): 1142- 1147.
3Gao K, Jiang Z, Lin Y, et al. Dietary L-arginine supplementation enhances placental growth and reproductive performance in sows [J]. Amino acids, 2012, 42(6): 2207-2214.
4Lin G, Liu C, Feng C, et aL Metabolomic analysis reveals differ- ences in umbilical vein plasma metabolites between normal and growth-restricted fetal pigs during late gestation[J]. The Journal of nutrition, 2012, 142(6): 990-998.
5Shi M, Zang J, Li Z, et ol. Estimation of the optimal standardized ileal digestible lysine requirement for primiparous lactating sows fed diets supplemented with crystalline amino acids[J].Animal Sci- ence Journal, 2015. doi: 10.1111/asj. 12377.
6Hu Y J, Gao K G, Zheng C T, et al. Effect of dietary supple- mentation with glycitein during late pregnancy and lactation on antioxidative indices and performance of primiparous sows [J]. Journal of Animal Science, 2015, 93(5): 2246-2254.