| Popis: |
The objective of this research was to evaluate source and extent of tropical adaptation affecting heifer BW and productivity traits. The F1 heifers with Brangus (BN) dams were sired by Braford (BFBN; n = 44), Hereford (HEBN; n = 29), and Bonsmara (BOBN; n = 58) sires. The F1 heifers with Angus (AN) dams were sired by Hereford (HEAN; n = 32) and Bonsmara (BOAN, n = 40) sires. The F1 heifer breeds did not differ (P > 0.22) for pregnancy and weaning rate. Calving rate was similar (P > 0.26) among F1 heifer breed types, but there was a tendency (P 0.17) for BFBN and HEBN F1 cows and for HEBN and BOBN F1 cows but was greater (P 0.25) among BFBN, HEBN, and BOBN F1 cows but was greater (P 0.35) of any particular breed type based on calf:dam weaning BW ratios. |
