to characterize the secretory patterns of luteinizing hormone ( lh ) , follicle stimulating hormone ( fsh ) and prolactin ( prl ) during prepubertal development of the gilt , blood samples were collected at 20-min intervals for 4 h once a week from four littermate gilts 10 to 18 wk of age and from another group of four littermate gilts 19 to 25 wk of age .
C1327616
secretory
C0033371
prolactin