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Effects of light and food on plasma leptin concentrations in ewes

Published online by Cambridge University Press:  18 August 2016

T. Tokuda ,
T. Matsui  and
H. Yano
T. Tokuda*
Affiliation:
Laboratory of Animal Nutrition, Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
T. Matsui*
Affiliation:
Laboratory of Animal Nutrition, Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
H. Yano
Affiliation:
Laboratory of Animal Nutrition, Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
*
†Present address: Laboratory of Animal Science, Faculty of Life and Environmental Science, Shimane University Matsue-shi, 690-8504, Japan.
‡To whom correspondence should be addressed.
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Abstract

Plasma leptin concentration shows pulsatility and diurnal rhythm in humans. However, there are few reports concerning the 24-h profile of circulating leptin levels in ruminants. Five crossbred ewes were housed in metabolism cages under a 1-h light-dark cycle. The ewes were offered alfalfa hay daily to meet their energy requirement. Blood samples were collected at 15-min intervals for 24 h. Plasma leptin concentrations were determined using a radioimmunoassay and the profile of plasma leptin levels was analysed by the PULSAR algorithmic program for detecting pulse. Plasma leptin concentration changed in a pulsatile fashion. The mean leptin concentration was 2·93 ng/ml. The mean pulse frequency was 4·8 pulses per day and the mean pulse amplitude was 0·67 ng/ml with an average pulse length of 1:13 h. Plasma leptin level was not affected by feeding or lighting cycle. These results indicate that plasma leptin level in sheep shows pulsatility but diurnal rhythm is not exhibited.

Keywords

diurnal variationhydrocortisoneleptinsheep
Type
Growth, development and meat science
Information
Animal Science , Volume 71 , Issue 2 , October 2000 , pp. 235 - 242
Copyright
Copyright © British Society of Animal Science 2000

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