J. Anim Sci.
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J. Anim Sci. 1958. 17:527-533.
© 1958 American Society of Animal Science
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Effect of Calving Date on Subsequent Calving Performance

Martin J. Burris1 and B. M. Priode

Virginia Agricultural Experiment Station and U. S. Department of Agriculture2

Abstract

Calving records of Angus, Hereford, and Shorthorn cows at the Beef Cattle Research Station at Front Royal, Virginia, from 1950 to 1956 were analyzed to determine the effect of calving date on subsequent calving performance. Three determinations made from these data include: (1) Percent of cows calving each 20-day period during the calving season which failed to calve the following season, (2) comparison of the previous calving dates of all cows which failed to calve with the previous calving dates of all cows which calved in both years and, (3) the association between calving dates of cows when these calvings occurred in successive calving seasons.

The regression of percent of cows failing to calve on previous calving date was 6.1% per 20-day period or 6.1% fewer cows calving for each delay of 20 days in previous calving date. The calving date in the previous year of cows which failed to calve was 9.5 days, 18.2 days, and 15.4 days later than the calving date of contemporary cows in the first year which calved in both seasons in the Angus, Hereford, and Shorthorn herds, respectively. The correlation between successive calving dates was 0.33, 0.38, and 0.46 for the Angus, Hereford, and Shorthorn herds, respectively. These observations indicate that selection for early calving date would result in an increase in calving percentage and an earlier calving date in1 the next year when the breeding season is limited to approximately 90 days.

Footnotes

1 Present address, State Experiment Stations Division, A.R.S., U.S.D.A., Washington 25, D. C.

2 Front Royal, Virginia.






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Copyright © 1958 by the American Society of Animal Science.