Abstract

A sexual differentiation in fat levels was established for pronghorns ( Antilocapra americana ) collected in Colorado. Females maintained higher fat levels through most of the year, and their mean fat levels reached a minimum later in the spring than did the mean fat levels for males. Fat storage was minimal in males until after the breeding season. Both sexes reached maximum fat levels during November and December. Significant fluctuations occurred in year-long trends established for the kidney fat index, visceral fat index, and depth of thoracic fat. Through the year the fat content of bone marrow remained at a high level, whereas depth of rump fat remained minimal.

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