5Pluske,J.R.,Williams,I.H.,Zak,LJ.Feeding lactating primiparous sows to establish three divergent metabolic states[J].Milk production and Pig growth, J Anita Sci,1998,76,1165-1171.
6Auldist D.E.,Morrish L.,Eason P. The influence of litter size on milk production of sows[J].Anim Sci, 1998,67:333-337.
7E.J.Clows,F.X.Aheme,A.L.Schaefer,G.R.Parturition body size and body protein loss during lactation influence performance during lactation and ovarian function at weaning in first-parity sows[J]. J.Anim.Sci,2003,81:1571-1528.
