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Effects of plane of nutrition, diethylstilboestrol implantation and slaughter weight on the performance of Israeli-Friesian intact male cattle

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

The effects of two levels of energy intake, ad libitum and 80% of ad libitum, of diethylstilboestrol implantation and no such treatment, and of two slaughter weights (‘450’ and ‘490’ kg), on the performance of Israeli-Friesian intact male cattle were studied.

Average daily gain was 1130 g and 959 g and daily carcass gain was 630 g and 553 g for animals on ad libitum and 80% of ad libitum energy intake, respectively. Average daily gain was 1038 g and 944 g and daily carcass gain was 595 g and 562 g, for diethylstilboestrol-treated and untreated animals, respectively. Slaughter weight had little effect on rate of gain.

The differences in conversion ratio of ME into live weight between treatments were small. Diethylstilboestrol-treated animals were slightly more efficient.

The non-implanted animals on the restricted plane of nutrition and which had been slaughtered at ‘490’ kg had a significantly higher dressing percentage, a higher percentage of fat trim and less bone than animals slaughtered at ‘450’ kg body weight on both levels of nutrition.

Among the diethylstilboestrol-implanted male calves, however, the animals fed at 80% of ad libitum feed and killed at ‘450’ or ‘490’ kg live weight had significantly more fat trim in the carcass and less bone than the animals fed ad libitum.

Type
Research Article
Information
Animal Production , Volume 22 , Issue 1 , February 1976 , pp. 55 - 59
Copyright
Copyright © British Society of Animal Science 1976

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