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Reproduction in Domestic Ruminants II

Reproduction in Domestic Ruminants II

Regulation of Folliculogenesis

bp0002rdr14 | Regulation of Folliculogenesis | REDR1990

Gonadotrophic control of follicle growth in the ewe

McNeilly AS , Picton HM , Campbell BK , Baird DT

Summary. Preovulatory follicle growth in the ewe is dependent on FSH although no precise relationship appears to exist between plasma concentrations of FSH and the number of preovulatory follicles which develop or ovulation rate. This may be related to a hitherto unrecognized influence of pulsatile LH on the growth of large follicles. Preovulatory follicle growth is dependent on the presence of basal amounts of LH, but pulsatile LH, while being essential to su...

bp0002rdr15 | Regulation of Folliculogenesis | REDR1990

Follicle selection in domestic ruminants

Fortune JE , Sirois J , Turzillo AM , Lavoir M

Summary. Ultrasound imaging has shown that cattle exhibit 2 or 3 waves of follicular development during an oestrous cycle. The waves consist of the contemporaneous appearance, about every 7 days, of a group of follicles ≥ 5 mm in diameter. One follicle gradually becomes larger than the rest (i.e. dominant). There are several lines of evidence suggesting that the waves occur regularly under conditions of basal LH and FSH. (1) Cycles with 3 waves of follic...

bp0002rdr16 | Regulation of Folliculogenesis | REDR1990

The ovarian insulin-like growth factor system

Hammond JM , Mondschein JS , Samaras SE , Smith SA , Hagen DR

Abstract unavailableKeywords: ovary; ovarian follicles; granulosa cells; growth factors; insulin-like growth factors© 1991 Journals of Reproduction & Fertility Ltd...

bp0002rdr17 | Regulation of Folliculogenesis | REDR1990

Nutrient effects on ovulation rate, ovarian function and the secretion of gonadotrophic and metabolic hormones in sheep

Downing JA , Scaramuzzi RJ

Abstract unavailableKeywords: sheep; ovulation rate; nutrition; gonadotrophins; metabolic hormones© 1991 Journals of Reproduction & Fertility Ltd...