Andrzej Sechman

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The organism of a food-deprived animal is directed toward minimizing energy expenditure and plasma levels of catabolic hormones and glucose are also reduced. Stress, on the other hand, is associated with enhancement of metabolic processes, elevated plasma catabolic hormones, and higher glucose levels. The question arises as to whether food deprivation may(More)
In a previous experiment, food deprivation was found to suppress the increase of plasma cortisol and thyroid hormones in stressed animals. Because both the hypothalamo-adrenocortical and the thyroid axes are stimulated during stress, we investigated in this study whether a similar pattern of changes occurs in food-deprived sheep following corticotropin(More)
The aim of this study was to examine the in vivo effect of growth hormone (GH) on cell proliferation and apoptosis and on the gene expression of selected proteins in the chicken oviduct before sexual maturity (first oviposition). Ten-week-old Hy-Line Brown chickens were injected three times a week with 200 μg · kg-1 body weight of recombinant chicken GH(More)
SUMMARY In avian species, synthesis of sex steroids by embryonic gonads is regulated by luteinizing hormone (LH) and follicle-stimulating hormone (FSH). In order to elucidate the role of the two gonadotropins in gonadal axis development during the second half of chicken embryogenesis, pituitary expression of LH β subunit (LHβ) and FSH β subunit (FSHβ) mRNAs(More)
The article summarizes results of studies concerning: 1/ qualitative evaluation of pig nuclear donor cells to somatic cell cloning, 2/ developmental potency of sheep somatic cells to create chimera, 3/ efficient production of chicken chimera. The quality of nuclear donor cells is one of the most important factors to determine the efficiency of somatic cell(More)
Several lines of evidence indicate that retinoids, derivates of vitamin A, affect reproductive function in birds, however, the mechanism of their action in the ovary is still unknown. Therefore, the present study was designed (i) to show whether in the domestic hen 9-cis retinoic acid (9-cis RA), one of the retinoids, influences steroid secretion in vitro(More)
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