| Autor: |
Kappel, L. C., Hembry, F. G., Humes, P. E., Schilling, P. E., Klett, R. H. |
| Zdroj: |
Journal of Animal Science; September 1972, Vol. 35 Issue: 3 p591-597, 7p |
| Abstrakt: |
Summer and winter feeding trials were conducted for two years to study climatic, breed and ration effects on the feedlot performance and carcass characteristics of steers. Generally, seasonal effects were significant but were not consistent over years. This was attributed to differences in the productive potential of the four groups of cattle.Hereford cattle consumed more feed, had lower dressing percentages and higher carcass and yield grades than Hereford × Brahman cattle. No season × breed interactions were detected as differences between the Herefords and crossbreds were approximately the same during both seasons.Increasing the fiber level of the ration resulted in increased feed intake and lowered feed efficiency. No differences in gain were attributed to ration crude fiber level. Season × fiber level interactions were not significant, indicating that the fiber heat increment did not influence ration utilization differently during summer and winter.Gains were significantly increased while feed consumption and efficiency were increased, although not significantly, when soybean meal replaced urea in the diets. Summer feeding conditions appeared to lower consumption of the urea-containing rations and thereby depress animal performance.Methods of antibiotic administration had no effect on feedlot performance. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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