Composition and nutrient content of the diets.

CP, crude protein; TB, tributyrin; Ca, calcium; P, phosphorus.
a In the tributyrin (TB) diets, 0.1% TB was added to the control diet. TB (casein-coated; net content of TB, 50%) was supplied for free by the Xin Ao Company in Xia Men, China. The 2 diets were isonitrogenous and isoenergetic.
b Main contents of the pre-mixed mixture (per kg of the pre-mixed mixture): Cu (as CuSO4·5H2O) 600 mg; Fe (FeSO4·7H2O) 8400 mg; Mn (MnSO4·H2O) 315 mg; Se (as Na2SeO3) 17 mg; Zn (ZnSO4·7H2O) 12500 mg; vitamin A 55000 IU; vitamin D 5500 IU; vitamin E 400 IU; vitamin K 12.5 mg; biotin 2 mg; choline 15 mg; folacin 7.5 mg; riboflavin 100 mg; thiamin 317.5 mg; vitamin B6 175 mg; and vitamin B12 500 mg.
c Nutrient contents of CP, Ca, and P were the examined values; the contents of other nutrients were calculated values.
Composition and nutrient content of the diets.