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Insulin-like growth factor 1, growth and body composition in red deer stags

Published online by Cambridge University Press:  02 September 2010

J. M. Suttie ,
I. D. Corson ,
P. D. Gluckman  and
P. F. Fennessy
J. M. Suttie
Affiliation:
MAFTech Invermay Agriculture Centre, Private Bag, Mosgiel, New Zealand
I. D. Corson
Affiliation:
MAFTech Invermay Agriculture Centre, Private Bag, Mosgiel, New Zealand
P. D. Gluckman
Affiliation:
Department of Paediatrics, University of Auckland Medical School, Private Bag, Auckland, New Zealand
P. F. Fennessy
Affiliation:
MAFTech Invermay Agriculture Centre, Private Bag, Mosgiel, New Zealand
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Abstract

Insulin-like growth factor 1 (IGF1) correlates with antler growth and body growth in penned red deer stags. The present study aimed to investigate the relationships among plasma concentration of IGF1, body growth and carcass composition in grazing stags. Twenty-eight 10-month-old stags were kept at pasture from September to February. They were bled, weighed and their antlers measured fortnightly. Plasma was analysed for total IGF1. All stags were slaughtered in February (aged 15 months); organ weights were recorded and the carcasses were analysed chemically for water, fat and ash. The stags began the study weighing 60·7 (s.e. 1·4) kg and were 96·3 (s.e. 2·0) kg at the end. They grew rapidly in spring and early summer but growth rate slowed in mid summer before increasing again in late summer.

Total plasma 1GF1 for each stag throughout the study correlated positively with antler length (P < 0·001), total live-weight gain (P < 0·001), hot carcass weight (P < 0·01), fat-free carcass weight (P < 0·01), carcass fat weight (P > 0·05) and carcass fat percentage (P > 0·05). Thus IGF1 correlated significantly with all measures of body weight except fat. IGF1 correlated positively with antler growth rate (P < 0·001) calculated individually for each stag during each fortnight. IGF1 correlated positively with the spring phase of live-weight gain calculated as above (P < 0·001) but negatively (P < 0·01) with live-weight gain during the late summer growth phase. The relationships between IGF1 and growth in penned stags also pertain in grazing animals, and in addition 1GF1 is closely associated with carcass lean mainly via an overall effect on body size.

Keywords

body measurementscarcass compositionIGF1red deer
Type
Research Article
Information
Animal Production , Volume 53 , Issue 2 , October 1991 , pp. 237 - 242
Copyright
Copyright © British Society of Animal Science 1991

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