RESUMO
Plasma concentrations of 5alpha-androst-16-en-3-one (5alpha-androstenone), the steroid responsible for boar taint, were measured by radioimmuno-assay in eight sows during the estrous cycle. The steroid concentrations ranged from a low of approximately 500 pg/ml to a high of 2.2 ng/ml during the estrous cycle. Noticeable features in the hormone profile of sows sampled, were the decline in the period preceding estrus, comparatively low levels at estrus and an increase post-estrous. Changes in hormone concentrations over the estrous cycle were significant (P<.05). The timing of the changes in 5alpha-androstenone concentrations during the period preceding estrus among the sows studied was not consistent. The physiological significance of the changes in 5alpha-androstenone concentrations during the period preceding estrus among the sows studied was not consistent. The physiological significance of these changes in 5alpha-androstenone concentration seen during the estrous cycle is not clear. Any bearing these changes may have on the malefemale sexual relationship in pigs needs to be further investigated in view of the known pheromonal function of 5alpha-androstenone.
Assuntos
Desenvolvimento Ósseo , Fósforo/metabolismo , Suínos/crescimento & desenvolvimento , Ração Animal , Animais , Cálcio da Dieta/administração & dosagem , Cálcio da Dieta/metabolismo , Proteínas Alimentares/administração & dosagem , Proteínas Alimentares/metabolismo , Feminino , Fêmur/análise , Fêmur/crescimento & desenvolvimento , Masculino , Minerais/análise , Fósforo/administração & dosagem , Fósforo/sangue , Rádio (Anatomia)/análise , Rádio (Anatomia)/crescimento & desenvolvimento , Fatores Sexuais , Glycine max , Zea maysRESUMO
Two Nike-Tomahawk rockets each carrying two Biosondes were launched from Wallops Island, Virginia, the first on 10 December 1970 and the second on 16 December 1970. The primary objective of both flights was to test the Biosonde life support system under a near weightless environment and secondarily to subject the Hirudo medicinalis to the combined stresses of a rocket flight. The duration of the weightless environment was approximately 6.5 minutes. Data obtained during the flight by telemetry was used to ascertain the operation of the system and the movements of the leeches during flight. Based on the information obtained, it has been concluded that the operation of the Biosondes during the flight was similar to that observed in the laboratory. The experiment and equipment are described briefly and the flight results presented.