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Effects of Different Light Regimes on Prolactin Concentration in Rat

By Animal Research International, University Of Nigeria, Nsukka.

Summary

Permanent light will
reduce the prolactin level. It seems to be one of the causes of short estrous cycles in
permanent light is prolactin levels. These finding can be used as a model in human
societies.
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Abstract

ABSTRACT
Prolactin is a peptide hormone which is secreted from hypophysis. Prolactin
concentration differs in male and female. Even though prolactin has lactotpope effect, it
has disturbances effects on pulsatory secretion of gonadotropins as well as on ovulation.
In spite of different plasma level of prolactin in different seasons, the effects of light
regime on prolactin secretion still is unclear. Eighty Wistar rats were selected and divided
into four groups. Each treatment was exposed in different photoperiod; natural light
(control NL), 24 hours light (permanent light LL), 24 hours darkness (permanent
darkness DD), and 12 hours light-12 hours darkness (light-dark LD). Blood samples from
the heart were taken every 3 month during year. Prolactin concentration was determined
using RIA. Data were analyzed using ANOVA and means were compared using Duncan
multiple range test. Prolactin concentration in control (NL), dark (DD), light-dark (LD)
and permanent light (LL) were 1.10, 1.00, 0.80 and 0.60 ng/ml, respectively. Light
regime had a significant effect on prolactin concentration (p<0.05). Prolactin was
significantly lower in permanent light than other treatments. Means of prolactin in
permanent dark and light-dark weren’t differ with control (p>0.05). Permanent light will
reduce the prolactin level. It seems to be one of the causes of short estrous cycles in
permanent light is prolactin levels. These finding can be used as a model in human
societies.

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