Annual change of Prolactin and growth hormone in Angora goats

摘要

In this study, it was aimed to investigate the relationship between concentrations of Prolactin (PRL) and Growth hormone (GH) and seasonal factors such as temperature and photoperiod for one year in 13 heads (6 female and 7 male) of 1.5 years old Angora goat. For this purpose, to determine hormones concentrations, blood samples were taken from jugular vein of each goat in every month for one year. Hormones analyses in the serum were performed by enzyme immunoassay (EIA) method. Monthly climatic values and photoperiod of the period during which the experiment was conducted, were obtained from the Turkish State Meteorological Service. In the study, in order to determine any possible differences in the observed hormones concentrations with respect to genders and months, repeated measures ANOVA analyses was performed. As a result of statistical analysis, there were significant differences among the (p 0.01) and genders (p 0.05) for GH concentrations, while there were significant interaction (p 0.01) of gender x month for PRL concentrations. As a result of the study, it was determined that the PRL releases were seasonally dependent and significantly affected by the seasonal changes of photoperiod and temperature, while GH was not seasonally dependent in Angora goats.