Effects of breed type and slaughter weight on feedlot performance and carcass composition in bulls

Jones, S.D.M.; Price, M.A.; Berg, R.T.

Canadian Journal of Animal Science 58(2): 277-284

1978


ISSN/ISBN: 0008-3984
Accession: 005292914

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Abstract
A trial is reported comparing the growth and carcass characteristics of bulls of 3 breed-types: Hereford crossbred (HC), beef synthetic (SY) and dairy crossbred (DC). Sixteen bulls of each breed-type were grouped 4 to a pen and randomly allocated to 1 of 2 slaughter weights: M (about 500 kg) and H (about 600 kg). The bulls weighed approximately 200 kg at the start of the trial and were fed a high concentrate cereal diet ad lib. Growth rate was slower and feed required per unit of gain greater for all breed-types in the H than in the M group. In all phases of growth the DC bulls had the greatest rate of gain and the SY bulls the least. The carcass data indicated that the HC bulls had the fattest carcasses and DC bulls the leanest. SY were intermediate. The grades indicated that increasing liveweight from 500-600 kg resulted in a shift towards fatter grades in earlier fattening types and away from fatter grades in later fattening types. The concept of target slaughter weights and ranges for various biological types of cattle is discussed.