Abstract
Over a year, mean serum growth hormone concentrations ranged from 0.5 to 3 ng/ml in tame muskoxen with the lowest values and fewest pulses between October and January. Serum insulin ranged from 0.25 to 0.92 ng/ml, with minima in summer. There were marked seasonal changes in serum insulin-like growth factor-1 in both tame and wild muskoxen but the late summer peak was higher and more distinct in the tame animals with levels reaching 160-250 ng/ml in September.
Highlights
Large annual changes in weight and body composi- IGF-1 data was presented previously (Adamczewski tion of female muskoxen (Ovibos moschatus) are partlyetal, 1992)
We studied 3 cows in ruminants are regulated by hormones such as which bred annually and 2 non-breeding hysterecgrowth hormone (GH), insulin-like growth factor-1 tomized cows with intact ovaries, all > 4 years old
To Jugular catheters were installed 36-48 hours prior investigate the seasonal regulation of weight change to sampling, using local anaesthetic and mild sedain muskoxen, we measured seasonal patterns in G H, tion (Tedesco, 1996)
Summary
Large annual changes in weight and body composi- IGF-1 data was presented previously (Adamczewski tion of female muskoxen (Ovibos moschatus) are partlyetal, 1992). The tame muskoxen were part of a research herd in winter (Thing et al, 1987; White et al, 1989). Wild muskox cows > 3 years old were shot by Inuit hunters near Cambridge Bay during 15 hunts in April, May, July, August, September and November from 1989 to 1993 (Adamczewski, 1995).
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