Androgen response of cryptorchid and intact rams to ovine LH

Androgen response of cryptorchid and intact rams to ovine LH.

Surgically induced cryptorchidism in rams resulted in elevated serum concentrations of LH but near-normal concentrations of androgen (testosterone and 5 alpha-DHT). Injections of ovine LH (2 X 50 microgram; 2 X 500 microgram) resulted in maximal androgen secretion in the intact rams and similar but lower concentrations in cryptorchid rams. Peak concentrations were 14.9 and 8.5 ng/ml in the inta...

Histological testicular parameters in bilateral cryptorchid adult rams

Heterogeneity of gonadotropins and levels of uncombined luteinizing hormone subunits in pituitaries of cryptorchid rams.

Pituitaries were collected from intact rams and rams that had been rendered bilaterally cryptorchid by surgery to examine the effects of cryptorchidism on gonadotropin heterogeneity, levels of uncombined luteinizing hormone (LH) subunits, and the apparent molecular sizes of LH and follicle-stimulating hormone (FSH). Cryptorchid rams had higher pituitary contents of LH and FSH as well as reduced...

Effect of morphine and naloxone on LH response and sexual behavior of rams (Ovis aries).

Effects of the opiate agonist, morphine, and antagonist, naloxone, on LH release, courtship behavior and ejaculation frequency of mature, sexually active or sexually inactive rams were investigated. Plasma LH concentrations were monitored from blood samples collected every 15 min for 10 hr (0800 to 1800 hr) from eight rams that were isolated from or in contact with estrous females. Plasma LH co...

The serum level of immunoreactive LH in intact and spayed androgen-sterilized rats.

The serum levels of lh were measured by radioimmunoassay in androgen-sterilized and normal cyclic rats, both in the presence and absence of ovaries. The serum of persistent-oestrous rats contained significantly more lh than that of normal rats on the day of oestrus, the raised level being comparable to that found in the adult male rat. The pituitary gland of the persistent-oestrus rat resembled...