Effect of ovine LH on the progesterone content of the granulosa cells in preovulatory follicles of the domestic fowl (Gallus Domesticus).
Laying hens were injected i.v. with a single dose of ovine LH (100 microgram) 6-8 hr after a known ovulation, i.e. when plasma LH concentrations are low. Groups of 4 birds were killed at 15 min intervals up to 1 h after injection and the complete granulosa was obtained from 4 or 5 of the largest preovulatory follicles of each bird for progesterone measurement by g.l.c. Compared with the saline-injected controls which had negligible levels of progesterone, granulosa progesterone increased in all the LH-treated birds. The maximum response (mean progesterone content 1966 ng/follicle) occurred 45 min after injection but there was a significant decline by 60 min. It is concluded that the granulosa cells provide most of the preovulatory plasma progesterone increase.
D000818:Animals; D002645:Chickens / Q000378:metabolism*; D005260:Female; D006107:Granulosa Cells / Q000187:drug effects* / Q000378:metabolism; D007986:Luteinizing Hormone / Q000494:pharmacology*; D010060:Ovulation; D011374:Progesterone / Q000378:metabolism*; D012756:Sheep
D011374:Progesterone; D007986:Luteinizing Hormone