| Autor: |
Adams, N. J., Edwards, Ronnie L., Smith, G. C., Riggs, J. K., Carpenter, Z. L. |
| Zdroj: |
Journal of Animal Science; August 1980, Vol. 51 Issue: 2 p270-278, 9p |
| Abstrakt: |
Data on performance and carcass characteristics of progeny from 13 Hereford bulls were obtained. Weaning data consisted of records on 80 steer progeny; postweaning data were obtained on 70 steer progeny. Comparisons were made between progeny sired by five bulls imported from England and progeny sired by eight bulls of domestic breeding. In addition, for the domestic bulls, comparisons were made among progeny groups sired by bulls selected on the basis of either performance data or visual appraisal. There were no significant differences in adjusted weaning weight, weaning weight per day of age or conformation score between the various sire groups. Progeny sired by imported bulls had significantly more pigmentation around the eyes than did progeny from domestic bulls. After a 168-day feeding period, progeny from bulls selected on the basis of visual appraisal had lower daily gains, lower weights per day of age and lower adjusted 440-day weights than progeny from bulls selected on the basis of performance data. Progeny sired by imported bulls had heavier slaughter and carcass weights per day of age than progeny sired by domestic bulls, primarily because of the lower performance of progeny from domestic sires selected on the basis of visual appraisal alone. Origin of sire had no effect on factors associated with USDA yield or quality grade. Carcasses from the various progeny groups were similar in composition, except that progeny from domestic sires had significantly higher percentages of trimmed bone-in round, loin, rib and chuck than progeny from imported sires. Percentage of edible portion and ratios of edible portion to fat or bone were similar for all sire groups. Progeny from all sire groups produced carcasses that were desirable in cutability and palatability. These data suggest that it is difficult to obtain cattle within a breed which are distinctly different in carcass traits when they are managed and fed alike. |
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