6FARMER C,QUESNEL H.Nutritional,hormonal,and environmental effects on colostrum in sows[J].Journal of animal science, 2009,87( 13 suppl): 56-65.
7YANG Y X, HEO S, JIN Z,et al.Effects of lysine intake during late gestation and lactation on blood metabolites,hormones,milk composition and reproductive performance in primiparous and multiparous sows[J]. Animal reproduction science, 2009,112(3): 199-214.
8LONG H F,JU W S,PIAO L G,et al.Effect of dietary energy levels of gestating sows on physiological parameters and reproductive performance[J].Asian-Australasian Journal of Animal Sciences,2010,23(8):1080-1088.
9CLOWES E J, AHERNE F X, FOXCROFT G R, et al. Selective protein loss in lactating sows is associated with reduced litter growth and ovarian function[J]. Journal of Animal Science. 2003, 81 (3): 753-764.