Influence of season and age on sexual maturation parameters in Texel, Suffolk and Ile-de-France rams: 2. Circulating concentrations of follicle stimulating hormone, luteinizing hormone, prolactine and testosterone

Abstract Follicle stimulating hormone (FSH), prolactin (PRL), luteinizing hormone (LH) and testosterone (T) secretions were studied in six Texel (Tx), nine Suffolk (S), and nine Ile-de-France (IDF) rams throughout the second and third years of life. The weekly mean concentrations of plasma T and FSH were higher ( P P P P P P P P P