Factors regulating ovulation rate in the ewe

Scaramuzzi, R. J.; Radford, H. M.

doi:10.1530/jrf.0.0690353

Cited by 99 publications

(64 citation statements)

References 31 publications

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“…It has been shown that active immunization of sheep against several of the steroids of reproduction will increase ovulation rate provided excessive titres are not reached (Scaramuzzi and Radford 1983). In the current experiments there was a decreased oestrous response associated with an increase in circulating antibody concentration such that no ewes with titres greater than 100 000 displayed oestrus, nor did they ovulate despite evidence of some follicular development.…”

Section: Discussioumentioning

confidence: 40%

“…Gonadotrophins are responsible for follicular growth in several species of mammal, including sheep (Bindon et al 1979) but the processes determining ovulation rate remain unclear (Scaramuzzi and Radford 1983). Administration of follicle stimulating hormone (FSH) or pregnant mare serum gonadotrophin (PMSG) increases the ovulation rate apparently by decreasing the proportion of large antral follicles which become atretic (Mauleon and Mariana 1977).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ovarian Response to PMSG Treatment in Ewes Immunized against Oestradiol-17ß

Mp¹,

Jd²,

Rm³

et al. 1985

Aust. Jnl. Of Bio. Sci.

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The effects of active immunization against oestradiol-17J3 on the ovarian response to pregnant mare serum gonadotrophin (PMSG) was investigated in Merino ewes. Immunized (79) and control (41) ewes were synchronized with intravaginal sponges, given either 750 or 1500 i.u. PMSG and then mated to rams or inseminated laparoscopically with fresh diluted semen. All control ewes mated naturally exhibited oestrus and 40 out of 41 control ewes ovulated. The ovulation rate was higher in the controls receiving 1500 i.u. PMSG than in those ewes which received 750 i.u. PMSG (10'2 v. 3'3).

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Section: Discussioumentioning

confidence: 40%

Section: Introductionmentioning

confidence: 99%

Ovarian Response to PMSG Treatment in Ewes Immunized against Oestradiol-17ß

Mp¹,

Jd²,

Rm³

et al. 1985

Aust. Jnl. Of Bio. Sci.

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show abstract

“…The number of induced ovulations was generally representative of the genotype and supported our previous hypothesis that the mechanism controlling the number of follicles maturing to the ovulatory stage is operative throughout the year in sheep, including seasonal anoestrus . There (Scaramuzzi and Radford, 1983 , 1995). From the analysis of ovine follicular growth patterns (Driancourt et al, 1985b(Driancourt et al, , 1986McNatty et al, 1990), it appears that high ovulation rate can be achieved through different pathways.…”

Section: Introductionmentioning

confidence: 99%

The effect of the Booroola (FecB) gene on peripheral FSH concentrations and ovulation rates during oestrus, seasonal anoestrus and on FSH concentrations following ovariectomy in Scottish Blackface ewes

Boulton

Haley²,

Springbett³

et al. 1995

Reproduction

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“…There is considerable variation in ovulation rate between breeds of sheep and between strains of sheep within breeds. Despite numerous studies the exact mechanisms which control ovulation rate are still not known (see reviews by Scaramuzzi & Radford, 1983;Webb & Gauld, 1984;Bindon, 1984). A number of follicular characteristics have been associated with higher ovulation rate.…”

Section: Introductionmentioning

confidence: 99%