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United States Department of Agriculture

Agricultural Research Service

Title: Reproduction and Maternal Performance of F1 Cows by Diverse Sire Breeds

item Cundiff, Larry
item Gregory, Keith
item Freetly, Harvey

Submitted to: Journal of Animal Science Supplement
Publication Type: Abstract Only
Publication Acceptance Date: November 17, 1997
Publication Date: N/A

Technical Abstract: F1 cross cows from Hereford, Angus, and composite MARC III (25% each Angus, Hereford, Red Poll and Pinzgauer) dams and by Hereford and Angus (H&A), Brahman (Bm), Boran (Bo), Tuli (Tu), Piedmontese (Pm) and Belgian Blue (Bb) sires were evaluated for reproduction and maternal performance when mated to produce progeny by Red Poll sires at 2 yr of age and Charolais and Belgian Blue F1 sires at 3 or 4 yr of age. Male calves were castrated shortly after birth. Calves were born in the spring of 1994 to 1996 and weaned at about 7 months of age. Significant differences were found among F1 cow breed groups for calf crop weaned (CALFWN, %), unassisted calvings (UNAST, %), birth weight (BWT, kg), calf survival to weaning (CSURV, %), and 200 d weaning weight (WNWT, kg), but not for calf crop percentage born for 200 d weaning wt per cow exposed (WNWT/EXP, kg). Number of cow exposed (NEXP), breed group means, and mean least significant tdifferences (LSD.05) were presented in the abstract.

Last Modified: 4/22/2015
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