The influence of radiation on the reproduction of sheep
2002
Stanikova, A. | Pastorova, B. | Halagan, J. | Sopkova, D. | Molnarova, M. (University of Veterinary Medicine, Kosice (Slovak Republic))
We focused on changes in the hypothalamic neurosecretion, morphology of brain ventricle ependyma and in the sexual apparatus of sheep after irradiation, and hormonal stimulation. We observed sheep in anoestrus. Synchronization was ensured with Agelin for 10 days. On day 5 after the instillation of sponges, we started with irradiation lasting for 5 days (2.5 Gy dose) and on day 10 we stimulated the sheep with SG and FSH. The samples from hypothalamus and the sexual apparatus intended for REM, were processed according to Murakami et al. (4) and additional 20 sheep were kept under observation for ovulation and potential gravidity. Hormonal treatment in combination with irradiation produced qualitative changes, more marked in the ependyma than in the hypothalamus. Despite the higher number of ovulations in irradiated and hormonally stimulated sheep, the examination of viability of irradiated oocysts showed the absence of gravidity in all 20 sheep after mating. This indicated that the dose of 2.5 Gy was not harmless to the reproductive system of sheep
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