cow-calf, performance records
Calving distribution and calf performance data were summarized from the CHAPS (Cow Herd Appraisal of Performance Software) analyses of 61 South Dakota cow herds. CHAPS uses beef cow weaning weight records to calculate adjusted 205-day weights and ratios, keep lifetime production records on cows, calculate Most Probable Producing Ability estimates for cows, produce a sire summary and analyze production according to cow age and 21 -day calving periods. The 1991 summary represents 6,196 cows for an average of 102 cows per herd. The herds ranged in size from 19 to 277 head. The average midpoint of the calving season for these herds was April 9. The average actual birth and weaning weights were 78.8 and 507.0 Ib, respectively, with the average age at weaning 205.3 days. Overall, 82.8% of the females calved by day 42 of their respective calving seasons, although there was considerable disparity in the percent calved by day 42 between the HIGH and LOW (92.9 vs 69.7%) calving distribution herds. This difference is important since actual weaning weights declined 35 to 60 Ib for each 21 days later that calves were born. In addition to these data for the state summary, CHAPS provides valuable information for making within herd selection and management decisions.
Number of Pages
South Dakota State University
Copyright © 1992 South Dakota State University.
Boggs, D. L., "Chaps Summary for South Dakota, 1991" (1992). South Dakota Beef Report, 1992. 3.