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ARS Home » Plains Area » Clay Center, Nebraska » U.S. Meat Animal Research Center » Nutrition, Growth and Physiology » Research » Publications at this Location » Publication #413715

Research Project: Optimizing Nutrient Management and Efficiency of Beef Cattle and Swine

Location: Nutrition, Growth and Physiology

Title: Utilization of rumen protected lysine and methionine in beef feedlot diets: impacts on steer performance

item Neville, Bryan
item Oliver, William
item Wells, James - Jim
item Crouse, Matthew
item Lindholm-Perry, Amanda
item Thorson, Jennifer
item Kuehn, Larry
item FREETLY, HARVEY - Retired ARS Employee

Submitted to: Journal of Animal Science Supplement
Publication Type: Abstract Only
Publication Acceptance Date: 4/11/2024
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Our objective was to compare intake, gain, and feed efficiency of steers fed rumen protected lysine and/or methionine in 10% crude protein diet relative to performance of steers fed a diet with 13% crude protein without added amino acids. One hundred sixty-one beef steers (429.7 ± 44.5kg) were utilized in this experiment. Calves were randomly assigned to treatments consisting of: 1) positive control diet (POS), formulated to contain 13.0-13.5% CP, 2) negative control (NEG) diet containing 10.2% CP, which also forms the basal diet for the remaining treatments, 3) rumen protected methionine (RPMet) 10.2% CP basal diet and 7.2 g/d supplemental methionine, 4) rumen protected lysine (RPLys) 10.2% CP basal diet and 18.5 g/d supplemental lysine, and 5) the combination of rumen protected lysine and methionine (RPMet+Lys) 10.2% basal diet with 7.2 and 18.5 g/d supplemental methionine and lysine, respectively. Initial and final body weights were unaffected by treatment (P >/= 0.24). Average daily gain for POS (1.93kg/d P