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Seasonal changes of metabolism and appetite in Soay rams

Published online by Cambridge University Press:  18 August 2016

C. McG. Argot ,
J. S. Smith  and
R. N. B. Kay
C. McG. Argot
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB21 9SB
J. S. Smith
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB21 9SB
R. N. B. Kay
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB21 9SB
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Abstract

Relationships between photoperiod and cycles of voluntary food intake (VFI) and maintenance energy requirements (MER) were determined in Soay rams, subjected to a 6-month photoperiodic regime. Food was offered ad libitum (no. = 5) or at a predicted maintenance level (no. = 5). All rams demonstrated 6-month cycles of VFI, growth and reproductive status. Metabolizable energy intake (MEI) was greatest in rams given food ad libitum (666 (s.e. 21.7) kJ/kg metabolic live weight (M0·75) and food-restricted (528 (s.e. 12.2) kJ/kg M0·75) rams during sexual quiescence. Conversely, MEI was minimal (ad libitum, 289 (s.e. 8.4) kJ/kg M0·75; restricted, 428 (s.e. 8.1) kJ/kg M0·75) during the rut. Distinct cycles of heat production (HP) accompanied changes in MEL Changes in HP were similar (P > 0·05) for both groups (ad libitum, 520 (s.e. 22.1) to 394 (s.e. 9.2) kJ/kg M0·75; restricted 503 (s.e. 14.0) to 407 (s.e. 17.5) kJ/kg M0·75) and therefore energy retention varied more (P < 0·015) when rams were given food ad libitum (ad libitum, 131 (s.e. 43-1) to -106 (s.e. 38.2) kJ/kg M0·75; restricted, 78·0 (s.e. 27.1) to -53.0 (s.e. 38.2) kJ/ kg M0·75). Apparent digestibility of dietary energy varied inversely with MEI (P < 0·01). MERs ranged from 524 (s.e. 35.0) kJ/kg M0·75 to 401 (s.e. 27.3) kJ/kg M0·75, a proportional fluctuation of ±0·13. Changes in metabolic rate preceded those in appetite, suggesting a causal relationship.

Keywords

digestibilityfood intakephotoperiodseasonalitysheep
Type
Research Article
Information
Animal Science , Volume 69 , Issue 1 , August 1999 , pp. 191 - 202
Copyright
Copyright © British Society of Animal Science 1999

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Footnotes

†

Present address: School of Biological and Earth Sciences. Liverpool John Moores University Byrom Street, Liverpool, L3 3AF.

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