6Johnson D E.Adaptational responses in nitrogen and energy balance of lambs fed a methane inhibitor[J].Journal of Animal Science,1974,38(1):154-157.
7Guan F,Liu S R,Shi G Q.Polymorphism of FecB gene in nine sheep breeds or strain and its effect on litter size,lamb growth and development[J].Animal Reproduction Science,2007,99(1/2):44-52.
8Owens F N,Dubeski P,Hanson C F.Factors that alter growth and development of ruminants[J].Journal of Animals Science,1993,71(11):3138-3150.
9Stanley C C,Williams C C,Jenby B F,et al.Effect of feeding milk replacer once versus twice daily on glucose metabolisn in holstein and jersey calves[J].Journal of Dairy Science,2002,85(9):2335-2343.