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Performance of Two Lines of Hereford Cattle in Two Environments¹

U.S. Department of Agriculture, Florida Agricultural Experiment Station, Gainesville 32601 and Montana Agricultural Experiment Station, Miles City 59301

Abstract

Two herds of Hereford cows, one originating at the U.S. Range Livestock Experiment Station, Miles City, Montana, and the other originating at the Brooksville Beef Cattle Research Station, Brooksville, Florida, were subdivided and half of each transferred to the opposite location. During the first 7 years (1962 through 1968) subsequent to the initial transfer, location-origin interactions were apparent in birth, weaning and yearling weights (P<.01) for both sexes. Performance to yearling ages favored Montana-originating cattle at the Montana location and cattle of Florida origin at the Florida location. Interactions were not apparent in traits of 5-year-old cows, with the exception of reproductive performance. Percent pregnant and percent weaned were lower for the cows of Montana origin located in Florida than for the other three location-origin subgroups, which were similar. Significant differences in most traits measured were observed between locations and between origin groups.

¹ This study was conducted under Regional Projects S-10 and W-1 at the U.S. Range Livestock Experiment Station, Miles City, Montana, and the Brooksville Beef Cattle Research Station, Brooksville, Florida, in cooperation with the State Agricultural Experiment Stations of Florida and Montana.

² Animal Science Research Division, A.R.S., University of Tennessee, Knoxville.

³ Florida Agricultural Experiment Station, Gainesville.

⁴ U.S. Range Livestock Experiment Station, A.R.S., Miles City. Montana.

⁵ Brooksville Beef Cattle Research Station, A.R.S., Brooksville. Florida.

⁶ Animal Science Research Division, A.R.S., Beltsville, Maryland.

⁷ Appreciation is expressed to J. S. Brinks, Nat M. Kieffer and R. S. Temple for contributions during initiation of the project and to B. W. Knapp and J. J. Urick for data collection and livestock management.

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