Document Detail

Measurements at calving for straightbred and crossbred cows of diverse types.
MedLine Citation:
PMID:  2254189     Owner:  NLM     Status:  MEDLINE    
Reproductive and calving records of 611 cows from F1 and F2 generations from a diallel mating system with Angus, Brahman, Hereford, Holstein and Jersey were examined. The inter se matings were by artificial insemination, and each cow had three or four parturitions. Dependent variables included weight, hip weight at first calving, age at first calving, gestation length and calving interval. Brahmans were the heaviest, tallest and oldest purebred at first calving. Crossbred Brahman females tended to be older than other crosses at first calving. Purebred Brahmans and one-half Brahman crosses also had the longest gestation lengths and calving intervals. First-gestation (F1) crossbred cows were 18 kg heavier (P less than .05), 2.0 cm taller (P less than .01) and 35 d younger (P less than .05) at first calving than contemporary straightbreds. Average maternal heterosis for height at calving was significant (1.4 cm; P less than .05); however, estimates of specific and average maternal heterosis for measurements taken at first calving were generally nonsignificant. Estimates of specific and average individual and maternal heterosis were generally small and nonsignificant for gestation length and calving interval.
R E Sacco; J F Baker; T C Cartwright; C R Long; J O Sanders
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of animal science     Volume:  68     ISSN:  0021-8812     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  1990 Oct 
Date Detail:
Created Date:  1991-01-24     Completed Date:  1991-01-24     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  3103-8     Citation Subset:  IM    
Texas Agricultural Experiment Station, College Station 77843.
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MeSH Terms
Age Factors
Cattle / growth & development*
Crosses, Genetic*
Labor, Obstetric
Least-Squares Analysis

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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