The influence of long-term hypodynamy on the calcium and phosphorus levels was studied in the bones of Japanese quails. The hypodynamy evoked different changes in the calcium and phosphorus content in males and females. The calcium content in the marrow of femurs was only changed in the hens, while in cockerels it was significantly decreased in the upper part and marrow of the tibia. Furthermore, changes in the phosphorus content were observed only in the tibia of cockerels., J. Antalíková, M. Baranovská, I. Mravcová, V. Sabo, P. Škrobánek., and Obsahuje bibliografii
The aim of this study was to investigate the effects of long-term stay of Japanese quail in simulated microgravity on some sexual features of males. As a model for simulating microgravity exposure of birds in laboratory conditions was used hypodynamia. The mean left testis weight in males reared under hypodynamia from day 3 up to 180 days of age was lower than that of control (P<0.05), but the right testis weight differences between both groups were not significant. Also the area, volume and foam production of cloacal gland was not significantly decreased in hypodynamia birds at the end of experiment. By contrast, the plasma testosterone concentration of males living in hypodynamia was reduced about 50 % at 90 and 180 days of age in comparison to control (P<0.05) suggesting some negative effects on sexual development. Our results demonstrated that male quail kept under simulated microgravity conditions were sexually competent although their sexual efficiency was reduced especially in terms of plasma testosterone., P. Škrobánek ... [et al.]., and Obsahuje seznam literatury