Influence of ruminal degradable intake protein restriction on characteristics of digestion and growth performance of feedlot cattle during the late finishing phase

Table 1 Diet composition of experiment 1 and 2 ¹

	Urea fermentation potential
Item	0	0.6	1.2
Ingredient (g/kg of DM)
Steam flaked corn	797.5	803.0	809.0
Sudangrass hay	50.0	50.0	50.0
Alfalfa hay	50.0	50.0	50.0
Urea	12.5	7.0	1.0
Cane molasses	50.0	50.0	50.0
Yellow grease	20.0	20.0	20.0
Limestone	14.0	14.0	14.0
Trace mineral salt²	4.0	4.0	4.0
Magnesium oxide	2.0	2.0	2.0
Monensin³	0.022	0.022	0.022
Nutrient composition (DM basis)⁴
NE_m (Mcal/kg)	2.23	2.24	2.25
NE_g (Mcal/kg)	1.56	1.56	1.58
DE (Mcal/kg)	3.86	3.86	3.89
CP (g/kg)	130.0	115.0	99.1
RDP (g/kg of CP)	648	600	530
NDF (g/kg)	125.0	125.0	125.0
Calcium (g/kg)	6.6	6.6	6.6
Phosphorus (g/kg)	2.8	2.8	2.8

¹Chromic oxide (0.40%) was added in substitution of corn grain as a digesta marker in Trial 1. RDIP, rumen degradable intake protein. UFP, estimated urea fermentation potential.
²Trace mineral salt contained: CoSO4, 0.068%; CuSO4, 1.04%; FeSO4, 3.57%; ZnO, 1.24%; MnSO4, 1.07%; KI, 0.052%; and NaCl, 92.96%.
³Rumensin80 (Elanco Animal Health, Greenfield, IN).
⁴Based on tabular values for individual feed ingredients (NRC, [17]).

ISSN: 2055-0391