Changes in estradiol, progesterone, melatonin, prolactin and thyroxine concentrations in blood plasma of goats following induced estrus in and outside the natural breeding season

The aim of this trail was to determine and compare the profiles of changes in progesterone (P4), 17-β-estradiol (E2), melatonin (MEL), prolactin (PRL) and free thyroxine (FT4) in the peripheral blood following induced estrus in and outside the natural breeding season in goats. Observations were made...

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Bibliographic Details
Published in:Small ruminant research 2004-03, Vol.51 (3), p.209-219
Main Authors: Blaszczyk, B, Udala, J, Gaczarzewicz, D
Format: Article
Language:English
Subjects:
Estrus synchronization
Free thyroxine
Goats
Melatonin
Prolactin
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Summary:The aim of this trail was to determine and compare the profiles of changes in progesterone (P4), 17-β-estradiol (E2), melatonin (MEL), prolactin (PRL) and free thyroxine (FT4) in the peripheral blood following induced estrus in and outside the natural breeding season in goats. Observations were made on Anglo-Nubian does in the autumn (n=12) and spring (n=12). Does were treated with intravaginal progestagen sponges (40mg FGA) for 12 days, and 500IU PMSG i.m. at sponge withdrawal whereafter blood samples were collected. Samples were collected from 24 to 68h following sponge withdrawal and the occurrence of estrous symptoms was recorded. Estrus occurred in both groups (season) of animals. However, in autumn (breeding season) estrus occurred earlier and persisted longer than in spring (outside the breeding season). Also in autumn plasma concentration of progesterone (0.42±0.11 versus 0.27±0.08ng/ml; P
ISSN:0921-4488
1879-0941
DOI:10.1016/S0921-4488(03)00190-1