Effects of Breed on Follicular Dynamics and Oestradiol Secretion during the Follicular Phase in Sheep

Current study evaluates effects from breed and management background on follicular dynamics and endocrine output during the follicular phase of sheep oestrous cycle. Follicular phases were synchronized with three cloprostenol doses, 10 days apart, in three groups of 10 females of different non-proli...

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Bibliographic Details
Published in:Reproduction in domestic animals 2007-02, Vol.42 (1), p.29-33
Main Authors: Gonzalez-Añover, P, Encinas, T, Veiga-Lopez, A, Ammoun, I, Contreras, I, Ros, JM, Ariznavarreta, C, Tresguerres, JAF, Gonzalez-Bulnes, A
Format: Article
Language:English
Subjects:
Animal reproduction
Animals
Biological and medical sciences
Breeding
Cloprostenol - pharmacology
Dose-Response Relationship, Drug
Estradiol - secretion
Female
Fundamental and applied biological sciences. Psychology
Mammalian reproduction. General aspects
Menstruation
Ovarian Follicle - diagnostic imaging
Ovarian Follicle - physiology
Sheep
Sheep - genetics
Sheep - physiology
Time Factors
Ultrasonography
Vertebrates: reproduction
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Summary:Current study evaluates effects from breed and management background on follicular dynamics and endocrine output during the follicular phase of sheep oestrous cycle. Follicular phases were synchronized with three cloprostenol doses, 10 days apart, in three groups of 10 females of different non-prolific Spanish breeds (Manchega, Rubia del Molar and Negra de Colmenar). Development of all follicles reaching antral diameters >=2 mm was assessed by daily transrectal ultrasonographies, whereas follicular function was evaluated by measurement of plasma oestradiol concentrations. All the ovulatory follicles were present at induced luteolysis in Manchega sheep, while a 93.7% were detected in Rubia del Molar and Negra de Colmenar ewes. The mean size of these ovulatory follicles was similar between breeds at 0 h, but their growth rates were higher in Manchega ewes, reaching a larger size at oestrous detection than in Negra de Colmenar and Rubia del Molar sheep (p < 0.05). Conversely, the oestradiol levels increased with time in Rubia del Molar and Negra de Colmenar (p < 0.05); whilst remained stable in Manchega females. However, the patterns of follicular turnover were similar between breeds. These results indicate that, though differences in follicular size and size distribution, patterns of follicular turnover in sheep are affected neither by the breed nor by the background of management and selection.
ISSN:0936-6768
1439-0531
DOI:10.1111/j.1439-0531.2006.00718.x