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FOLLICULAR DEVELOPMENT IN HEIFERS INFUSED WITH FOLLICLE-STIMULATING HORMONE

Follicle-stimulating hormone from different species has been used to increase ovulation and calving rates in cattle, injections proving to be most successful when given during the late follicular phase of the oestrous cycle or in combination with progestagens (Willett & Buckner, 1953; Bellows, Anderson & Short 1969). Some investigations have resulted in substantial increases in ovulation and calving rates, but there is usually a high degree of variation in ovarian response. Patterns of follicular growth and atresia have been studied in cattle (Rajakoski, 1960) and hypotheses have been suggested to explain how exogenous FSH stimulates follicle growth in relation to normal stages of growth and atresia (Schilling & Holm, 1963).

There are no investigations on histometric evaluation of follicular development after FSH treatment. The purpose of this study was