Abstract
Sixty yearling heifers (827 lb initial body weight) were fed finishing diets an average of 95 days. To eliminate social interaction and riding, they were fed in individual pens. Diets were formulated using steam-flaked corn and alfalfa hay. Thirty of the heifers were given 0.5 mg/head daily of MGA. Feed intakes, daily gains, and feed efficiencies were not significantly affected by MGA. However, heifers fed MGA had a greater percentage of carcasses grading USDA Prime and Choice. There also was greater incidence of USDA yield grade 3 and 4 carcasses with MGA supplementation. MGA generally increased fat deposition, but had no significant effect on feedlot performance of individually fed heifers.
Highlights
As part of a larger study, we are looking at how Melengestrol acetate (MGA) affected several blood constituents
To eliminate social interaction and riding, they were fed in individual pens
Heifers fed MGA had a greater percentage of carcasses grading USDA Prime and Choice
Summary
As part of a larger study, we are looking at how MGA affected several blood constituents. This report focuses on how MGA affected the heifer’s performance and carcass quality. Previous research indicates that MGA improves feed efficiency and rate of gain when fed to heifers in feedlot pens. For this trial, heifers were fed in individual pens to eliminate social interaction and riding behavior. Our objective was to observe differences, when fed individually, in performance and carcass quality of heifers supplemented with 0.5 mg MGA per head daily versus heifers not supplemented
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