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Effect of age on energy utilization of early-weaned growing calves weighing less than 100 kg

Published online by Cambridge University Press:  02 September 2010

J. Sekine ,
R. Oura ,
S. Morita ,
T. Morooka  and
Y. Asahida
J. Sekine
Affiliation:
Animal Science Department, Hokkaido University, Sapporo 060, Japan
R. Oura
Affiliation:
Animal Science Department, Hokkaido University, Sapporo 060, Japan
S. Morita
Affiliation:
Animal Science Department, Hokkaido University, Sapporo 060, Japan
T. Morooka
Affiliation:
Animal Science Department, Hokkaido University, Sapporo 060, Japan
Y. Asahida
Affiliation:
Animal Science Department, Hokkaido University, Sapporo 060, Japan
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Abstract

To study, after weaning at 6 weeks of age, the effect of age on energy utilization of growing calves and to estimate the requirements of metabolizable energy (ME) for calves weighing less than 100 kg, 243 energy balance trials were conducted using 68 Holstein-Friesian castrated male calves at 7, 9 and 13 weeks of age. Regression analyses of energy retention (ER, kj/kg M0·75) on intakes of ME (kJ/kg M0·75) gave the following equations at the respective age: ER = 0·479 (s.e. 0·070) ME — 197, for 7 weeks, ER = 0·521 (s.e. 0·052) ME - 216 for 9 weeks and ER = 0·523 (s.e. 0·043) ME - 236, for 13 weeks. Amounts of ME for maintenance (MEm) calculatedas ER = 0 were 413, 415 and 451 kJ/kg M0·75 for calves at 7, 9 and 13 weeks of age, respectively. The efficiency of utilization of ME for growth was not significantly different among the ages and was 0·500 (s.e. 0023). ME required for growth was estimated to be 510 kJ/kg M0·75 for each kg gain in weight, irrespective of age. The requirements of ME of calves weighing less than 100 kg were lower than those estimated by extrapolation of British and American standards.

Type
Research Article
Information
Animal Production , Volume 48 , Issue 1 , February 1989 , pp. 75 - 79
Copyright
Copyright © British Society of Animal Science 1989

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References

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