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Some Factors Affecting Feed Utilization in Growing Beef Cattle¹

Oregon State College²

Abstract

Conclusions:

1. Bull calves decrease in efficiency more rapidly than heifers from body weights of 500 lb. to 800 lb. However, bulls continue to be more efficient than heifers at 800 lb. body weight.
   
2. Heavier calves at birth were more efficient during the test.
   
3. Age-on-test affected efficiency when corrected for maintenance, with younger calves being more efficient. There is some indication that age-on-test is associated with uncorrected efficiency.
   
4. Faster gaining calves utilized feed more efficiently than calves gaining less rapidly.
   
5. Line 2 animals were more efficient but gained at a slower rate than the animals of the other lines tested. There was no difference between any two of the remaining lines.
   
6. From 90 to 94 percent of the variations in feed efficiency are accounted for by variations in birth weight, age-on-test, and rate of gain.
   

¹ This study was conducted in cooperation with Bureau of Animal Industry, U. S. Department of Agriculture, and State Experiments Stations under Western Project W-1 on Beef Cattle Breeding Research. Approved for publication as technical paper 886 by the Director of Oregon Agricultural Experiment Station . Contribution of the Department of Animal Husbandry.

² Department of Animal Husbandry, Corvallis.