Effects of short- and long-term feeding of zinc oxide-supplemented diets on the mature, female domestic fowl with special reference to tissue mineral content
Tóm tắt
1. In Expt 1, the effects on laying hens of diets supplemented with zinc oxide providing up to 20 gadded zinc/kg were compared. In Expt 2 the diets contained up to 6 g added Zn/kg.
2. In both experiments, food intake, body-weight, egg number, and liver, oviduct and ovary weights/kg body-weight were significantly reduced by added ZnO; gizzard weight/kg body-weight was significantly increased. In Expt 2, pancreas weight was significantly reduced by added ZnO.
3. Liver, kidney and pancreatic Zn and iron concentrations were significantly elevated in both experiments.
4. In both experiments, liver, kidneys and pancreatic copper concentrations gave quadratic responses to added ZnO.
Từ khóa
Tài liệu tham khảo
Brake, 1977, Poultry Science, 56, 1697
Gentle, 1982, Journal of Intake Research, 3, 53
Hermayer, 1977, Poultry Science, 56, 1721
1975, The Nutrient Requirements of Farm Livestock no. 1, Poultry
Creger, 1977, Poultry Science, 56, 1706
Griminger, 1976, Avian Physiology, 312
Butler, 1971, Physiology and Biochemistry of the Domestic Fowl, 397
Romanoff, 1949, The Avian Egg, 353