1Booth P J,J carigon,G R Foxcroft.Nutritionnal Manipulation of Growth and Metabolic and Reprouctive in Prepubertal Gilt.Anim Sci,1996,74:840～848.
2Ramirez,et al.J Anim Sci,1999,75:1893～1898.
3Tokach M D,Pettgrew J E,Dial G D,et al.Characterization of luteinizing hormone secretion in the primiparous,lactating sow:Relationship to blood metabolites and retune-estrus interval [J].J Anim Sci,1992,70:2195～2201.
4Van H D B,N M Soede,B Kemp.Dietary energy source at two feeding levels during lactation of pri miparous sows:Ⅱ.Effects on periestrus hormone profiles and embryonal survival.J Anim Sci,2000,78:1520～ 1528.
5Zak L J,X Xu,R T Hardin,et al.Impact of different patterns of feed intake during lactation in the primiparous sow on follicular development and oocyte maturation.Journals of reproductin and fertility,1997,110:99～106.
