A . Arango , L . V . Cundiff and L . D . Van Vleck

نویسندگان

  • J. A. Arango
  • L. V. Cundiff
  • L. D. Van Vleck
  • Roman L. Hruska
چکیده

Breed differences for weight (CW), height (CH), and condition score (CS) were estimated from records (n = 12,188) of 2to 6-yr-old cows (n = 744) from Cycle IV of the U.S. Meat Animal Research Center’s Germplasm Evaluation (GPE) Program. Cows were produced from mating Angus and Hereford dams to Angus, Hereford, Charolais, Shorthorn, Galloway, Longhorn, Nellore, Piedmontese, and Salers sires. Samples of Angus and Hereford sires were 1) reference sires born from 1962 through 1970 and 2) 1980s sires born in 1980 through 1987. The mixed model included cow age, season of measurement and their interactions, year of birth, pregnancy-lactation code (PL), and breedgroup as fixed effects for CW and CS. Analyses of weight adjusted for condition score included CS as a linear covariate. The model for CH excluded PL. Random effects were additive genetic and permanent environmen

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تاریخ انتشار 2003