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Breeding System, Cow Weight and Milk Yield Effects on Various Biological Variables in Beef Production^1,2,

University of Guelph Guelph, Ontario, Canada NIG 2W1

Abstract

Diverse breed types were used to study the effects of breeding system, cow weight and milk yield on biological variables in beef production. Breeding systems included purebred Hereford (H), purebred Simmental (S), large rotational beef (LRB), small rotational dual purpose (SRD) and small rotational beef (SRB). Breeding systems differed for most traits studied, with LRB and S ranking highest, SRD and SRB intermediate and H lowest for most output and input variables. There existed wide ranges of cow weight (332 to 925 kg) and milk yield (1.2 to 19.0 kg/d). Increased cow weight caused all output (except postweaning average daily gain) and all input (except creep feed) variables to rise. Output and input were also positively affected by increased milk yield. Both linear and quadratic effects of increased milk on weaning weight and feed intake of calf to weaning were significant, indicating an optimum level of milk yield.

¹ The authors gratefully acknowledge IBM Canada Ltd. for computing facilities provided through their Co-operative Projects in Education Program and the financial assistance of the Ontario Ministry of Agr. and Food and the Nat. Sci. and Eng. Res. Council.

² Technical assistance provided by A. McBurney, C. Watson, C. Haworth and research station staff.

³ Dept. of Anim. and Poul. Sci.

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