Growth production and reproduction characteristics of the canadian breed of cattle and its 1st cross and backcross with the brown swiss 1. body weight and dimensions

Rony, D.D.; Fahmy, M.H.; Holtmann, W.B.

Canadian Journal of Animal Science 61(4): 853-860


ISSN/ISBN: 0008-3984
Accession: 005542823

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Body weight and 7 body dimensions measuring the length, height, width and depth were taken at birth and every 180 days up to 720 days of age on 49 pure Canadian, 49 1st cross of 1/2 Brown Swiss 1/2 Canadian and 30 backcross of 1/4 Brown Swiss 3/4 Canadian heifers. The animals were raised up to 180 days of age at the Deschambault Station [Quebec, Canada], then 1/2 the pure Canadian and the 1st cross were transferred to the La Pocatiere Station. At birth, the pure Canadian calves weighed 29.2 kg and were lighter thant the 1st and backcrosses by 6.9 kg (24%) and 4.8 kg (16%), respectively. The 2 crosses exceeded the pure Canadian in all the dimensions, the differences being significant in height at shoulder and width at rumps. At 360 days of age the 2 crosses were .apprx. 6% heavier and 4% higher at shoulder than the pure Candian. With the exception of body length after 1 yr of age in which the backcross was slightly inferior to the pure Canadian, the 2 crosses were generally larger than the pure Canadian, with the backcross being intermediate between the 1st cross and the pure Canadian. The effects of season of birth and age of dam were nonsignificant on most of the traits studied in this experiment.