TWENTY-FOUR HOUR SECRETORY PROFILES OF OVINE PROLACTIN AND GROWTH HORMONE

Publisher Website
Google Scholar
Abstract
It has been suggested that prolactin secretion exhibits a circadian rhythm and is related to ovine growth hormone (OGH) secretion in the ewe (Davis, 1972; Davis & Borger, 1972, 1973). Prolactin levels in ovine jugular vein blood can fluctuate rapidly, which makes it difficult to establish a temporal pattern of secretion. This problem may be overcome by continuous blood sampling, used here to measure prolactin in rams over 24 h. This secretory pattern is compared with the secretory pattern of OGH in the same animals. In particular, the interrelationship between prolactin and OGH is examined as well as attempting to define a circadian rhythm for the secretion of these hormones. Five Merino rams were used. Skin folding for the neck and trunk regions of each animal was scored by three independent observers (Carter, 1943). This confirmed that two rams (nos. 174 and 179) had minimal skin folding (mean score 2/18)

This publication has 0 references indexed in Scilit: