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Effect of concentrate: roughage ratio on the production of beef from Israeli-Friesian bulls slaughtered at different live weights†

Published online by Cambridge University Press:  02 September 2010

D. Levy ,
Z. Holzer  and
Y. Folman
D. Levy
Affiliation:
Agricultural Research Organization, Newe Ya'ar Regional Experiment Station, Israel
Z. Holzer
Affiliation:
Agricultural Research Organization, Newe Ya'ar Regional Experiment Station, Israel
Y. Folman
Affiliation:
Agricultural Research Organization, Newe Ya'ar Regional Experiment Station, Israel
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Summary

The effects of roughage level (15 and 35% of the ration) and of slaughter weight (400,450 and 500 kg) were studied in an experiment of 2 x 3 factorial design. Daily live-weight gains and carcass gains were significantly higher on the lower roughage levels, but there was no difference in degree of fatness of the carcass. Dry-matter intake expressed as a percentage of body weight was 2·91 on 35% roughage compared with 2·53 and 15% roughage, i.e. 15% higher on the highroughage diet. This compensated the animals on the high-roughage diet for the lower energy content of their feed. Rate of gain increased with an increase in slaughter weight. The percentage of fat trim and of saleable meat increased, while that of bone decreased significantly with an increase in slaughter weight. The animals on the lowroughage diet were approximately 11% more efficient than the others in converting metabolizable energy into live weight.

Type
Research Article
Information
Animal Production , Volume 20 , Issue 2 , April 1975 , pp. 199 - 205
Copyright
Copyright © British Society of Animal Science 1975

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