Fattening performance and carcass characteristics of male and female calves crossbreds of the black and white cattle holstein friesian x bulgarian red cattle with the limousin breed fattened up to different liver weights

Zakhariev, Z.I.; Sinivirski, G.; Petkov, P.I.

Zhivotnov"dni Nauki 26(4): 22-29

1989


Accession: 007345071

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Abstract
In the period 1986-1987 was conduced an experiment with three groups of male calves fattened up to 400 kg (group 1), 500 kg (group 2), and 600 kg live weight (group 3), and two groups of female calves fattened up to 400 kg (group 1) and 50 kg live weight (group 2). The animals were reared in an enclosed barn, loosely housed in pens, with slatted floor. Studies was the fattening performance of the animals and their carcass characteristics. Male calves attained 434.2, 4.97.2, and 637.5 days, and female calves - 417.0 and 507.1 kg live weight at the age of 510.0 and 615.0 days. For male calves feed units required per unit of gain came to 5.17, 6.6.7, and 7.42 FU, and for female calves to 6.67 and 7.44 FU. The dressing percentage of calves of both sexes was practically the same and ws in the range of 59.4 and 61.7%. On increase in weight the relative portion of carcass bones decreasd. Carcass bones of male calves amounted to 18.2, 17.9 and 16.8% and of female - 16.4, and 15.2% respectively. Besides, in male calves the deposited fat was smaller in quantity than in female.