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Environmental temperature and choice feeding of the broiler

Published online by Cambridge University Press:  09 March 2007

P. J. Cowan
Affiliation:
North of Scotland College of Agriculture, 581 King Street, Aberdeen AB9 1UD
W. Michie
Affiliation:
North of Scotland College of Agriculture, 581 King Street, Aberdeen AB9 1UD
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Abstract

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1. Broilers were kept under environmental temperature regimens of 16, 21, 26 or 31° and given, 22–57 d of age, either a complete diet or free-choice of whole wheat and a higher-protein food containing either 252 or 516 g crude protein (nitrogen × 6.25)/kg.

2. Broilers maintained at 16 and 21° consumed food at a significantly higher rate than those kept at 26° and the latter had a significantly higher food intake rate than broilers kept at 31°, for each feeding treatment. Compared with 21° the 57 d body-weight of broilers kept at 26° and 31° was significantly reduced.

3. When kept under the 16, 21, 26 and 31° regimens, the amount of whole wheat in the food consumed by the broilers choice-fed with wheat and the 252 g crude protein/kg food was 56, 55, 48 and 46% respectively. The corresponding values for the broilers on the second choice-feeding treatment were 80, 76, 79 and 72%.

4. Except for a single instance the choice-fed broilers grew at a significantly slower rate than broilers given the complete diet.

Type
Papers on General Nutrition
Copyright
Copyright © The Nutrition Society 1978

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