Published in Scientific Bulletin. Series F. Biotechnologies, Vol. XXIX, Issue 1
Written by Ivona Maria ZĂBAVĂ, Tudor Andrei KACENCO, Mădălina DEGENARO, Nicolae DOJANĂ
The biotechnology of producing egg-laying hen hybrids requires a high genetic selection pressure upon the origin inbred strains. The selection may affect the response of the reproductive system to the pituitary-ovarian axis control. In this work, we investigated the changes of ovarian and oviductal histomorphology response to the control exerted by the pituitary-ovarian axis in Lohmann and Leghorn hybrids, versus Sussex hens that has not been subjected to any selection pressure. Determinations were performed on 32-week-old hens, a key-age during the laying cycle. The results revealed differences between the hybrid hens and Sussex hens regarding the blood levels of gonadotropin follicle-stimulating hormone, luteinizing hormones (P<0.01), estrogen (P<0.05), triiodothyronine and tetraiodothyronine, and higher values of egg-laying frequency in hybrids versus Sussex. The number of different types of ovarian follicles (white follicles, small yellow and large yellow follicles), the structure of the follicle perivitelline membrane, and structure of the yolk was also modified in hybrids versus Sussex. Differences in epithelium histology of the infundibulum, magnum, isthmus and shell gland as well as histochemical particularities of these structures were also identified.
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