The purpose of the research reported here was to determine if pelvic dimensions of yearling beef bulls could be used as indicator traits in selecting for calving ease. Test gain over 140 days, end-of-test weight and pelvic dimensions of 3291 yearling beef bulls collected over four years from three test stations in Manitoba were first analysed to determine significant environmental effects. Breed group, station, year and their interactions as well as bull age were all significant effects on growth and pelvic dimensions. Growth and pelvic dimensions were adjusted for significant environmental effects and correlations were calculated. Pelvic dimensions were significantly associated (P < .05) to bull growth traits indicating that larger, faster growing bulls had larger pelvic dimensions. Expected Progeny Differences (EPD’s) for maternal and direct calving ease, weaning gain and yearling gain were available for 907 of the bulls. Pelvic dimensions were significantly (P < .05) associated to weaning gain and yearling gain EPD’s. There was no association, however, between pelvic dimensions and
calving ease EPD’s. This research indicates that pelvic dimensions of yearling beef bulls has little value as an indicator trait for calving ease either as expressed by their own calves or by their daughters' calves.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 206–209, 1994
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