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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Pattern of gonadotropin-releasing hormone (GnRH)-like stimuli sufficient to induce follicular growth and ovulation in ewes passively immunized against GnRH.

The pattern of GnRH-like stimuli capable of inducing follicular growth, ovulation, and luteal function was evaluated in ewes passively immunized against GnRH. The estrous cycles of 30 regularly cyclic sheep were synchronized using vaginal pessaries impregnated with a synthetic progestogen. Animals were passively immunized against GnRH (groups 2-5, n = 6) or the carrier protein, keyhole limpet hemocyanin (KLH; group 1, n = 6), at the time of pessary removal (PR). Circhoral delivery of saline (groups 1, 2, and 5) or low amplitude GnRH agonist (des-Gly10 GnRH ethylamide [100 ng/hourly pulse]; groups 3 and 4) was initiated at PR and continued for 3 (groups 4 and 5) or 12 days (groups 1-3). In groups 4 and 5, the amplitude of the GnRH-like stimulus was increased to 800 ng/hourly pulse (stimulus-shift) during the 24-h period beginning 72 h after PR. The amplitude of the hourly stimulus was adjusted to 100 ng/pulse 96 h after PR and continued at that level to Day 12. The endocrine changes associated with follicle growth and maturation (serum concentrations of estradiol [E2] above 10 pg/ml), ovulation (surge-like secretion of LH and FSH), and normal luteal function (serum concentrations of progesterone [ P] above 2 ng/ml) were evident in ewes passively immunized against KLH (group 1). In this group, the preovulatory surge of gonadotropins was noted 48.7 +/- 1.2 h after PR. These endocrine events were blocked by passive immunization against GnRH (group 2).(ABSTRACT TRUNCATED AT 250 WORDS)[1]

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