Farhat A,Chavez ER.Effects of line,dietary protein,sex,age and feet l with drawal on insulin-like growth factor-Ⅰin white Pekin ducks[J].Poultry Science,1999(78):1307-1312.
[4]
Summers J D,Leeson S.Laying hen performance as influenced by protein intake to sixteen weeks of age and body weight at point of lay[J].Poultry Sci,1994,73:495-501.
[5]
Chrisiensen V L,Nestor K E.Changes in functional qualities of turkey eggshells in strains selected for increased egg preduction or growth[J].Poultry Sci,1994,73:1458-1464.
