2J.O.Jansson,et al.Influence of gonadal steroids on age-and sex-related secretary patterns of growth hormone in the rat[J].Endocrinology,1984,114:1287-1294.
3D.L.Foster,et al.Effect of restricted nutrition on puberty in the lamb[J].Endocrinology,1985,116:375-381.
4J.E.Pettigrew,et al.Nutrition and female reproduction[J],Pig News Info,1996,12:559-562.
5M.Bonneau.Regulation of pig growth by somatotropic hormones:I secretion and mode of action[J].Pig News Info,1991,12:29-37.
6Frank X Aherne.Rethinking the sow's protein and energy requirements:gestation feeds[J].Feed Management,1997 Septement,19-22.
7National Research Council(1998)Nutrient requirements of swine[M];10 thresivsed edition.National Academy Press,Washington,D.C.