6Etherton T D,Winggins J P,Evock C S,et al.Stimulation of pig growth performance by porcine growth hormone and growth hormone-releasing factor[J].Janim Sci,1986,(63):1389-1399.
7Vasiatos-Youmken R,Scanes C G.Growth hormone and insulinlike growth factors in poultry growth required,optimal or ineffective?[J].Poultry Science,1991,70:1764-1780.