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Corticosterone mediated depression in reproductive functioning of white leghorn hens action mechanism



Corticosterone mediated depression in reproductive functioning of white leghorn hens action mechanism



Indian Journal of Animal Sciences 61(8): 803-807



The study was conducted to understand the mechanism of action of corticosterone, a major stress hormone in birds, in suppressing the ovarian activity and to search for remedial approach to check the drop in egg production under stressful conditions. Corticosterone was administered (i/m) in a single dose at the levels of 1, 2 or 4 mg/kg body weight after first oviposition of the sequence at the age of 22 to 26 or 35 to 40 or around 60 weeks in White Leghorn hens. Corticosterone delayed the oviposition in general and higher amount was needed to delay at peak laying stage (35 to 40 weeks). The interruption in ovulation was maximum in the largest ovarian follicle (F1) followed by next largest (F2) and none thereafter. In second experiment corticosterone (4 mg/kg bw) alone or after giving alpha-methyl-p-tyrosine (40 mg/hen, catecholamine synthesis blocker) was injected in hens (35 to 40 weeks) under similar conditions as in experiment 1. The delay in oviposition induced by corticosterone was prevented only by alpha-methyl-p-tyrosine. In experiment 3 the treatments remained the same as a in experiment 2 except that these were repeated for 6 days at a lower dose of corticosterone (2 mg/kg bw). The deleterious effect left by corticosterone on egg production was blocked only by alpha-methyl-p-tyrosine. It is suggested that corticosterone may mediate its adverse effect on reproductive functioning through catecholamines.

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