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Calorimetric studies on the effect of dietary energy source and environmental temperature on the metabolic efficiency of energy utilization by mature Light Sussex cockerels

Published online by Cambridge University Press:  27 March 2009

D. W. F. Shannon  and
W. O. Brown
D. W. F. Shannon
Affiliation:
Agricultural Chemistry Department, Queen's University, Belfast, Northern Ireland
W. O. Brown
Affiliation:
Agricultural Chemistry Department, Queen's University, Belfast, and Ministry of Agriculture, Northern Ireland
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Summary

Experiments to determine the net availabilities of the metabolizable energy (NAME) of a cereal-based diet and a maize-oil diet for maintenance and lipogenesis and the effect of environmental temperature on the NAME of the cereal-based diet are described. Four 1- to 2-year-old Light Sussex cockerels were used.

The relationship between ME intake and energy retention was linear for each diet. The NAME'S of the cereal-based diet given at 22° and 28 °C (70.6 ± 1.83 % and 73.6 ± 3.54%, respectively) were significantly (P < 0.05) lower than the NAME of the maize-oil diet (84.1 ± 1.85%). It is concluded that the beneficial effect of maize oil on the efficiency of energy utilization is due to a reduced heat increment rather than a reduction in the basal component of the heat production. The higher efficiency from the maize-oil diet led to an increase in the energy retained as fat.

The mean fasting heat production at 28 °C was 15 % lower than at 22 °C (43.2 ± 1.45 and 51.2 ± 1.09 kcal/kg/day, respectively). The NAME of the cereal-based diet was not significantly different when the birds were kept at 22° or 28 °C. The lower metabolic rate at 28 °C was reflected in a lower maintenance requirement and in an increase in the deposition of body fat.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 72 , Issue 3 , June 1969 , pp. 479 - 489
Copyright
Copyright © Cambridge University Press 1969

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