An experimental study of ova reception and some related phenomena in the rabbit

Hafez, E. S. E.

doi:10.1002/jmor.1051080305

Cited by 5 publications

(3 citation statements)

References 31 publications

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“…This compares favourably with in-vitro methods used by Kennelly & Foote (1965) and Adams (1954) who collected 80% and 78-5%, respectively, of the ova from excised tubes. It is a higher rate than has been reported previously for in-vivo recovery of rabbit ova (Adams, 1953;Hafez, 1961).…”

Section: Ovulation Points and Ova Recoveredmentioning

confidence: 48%

Repeated Superovulation Following Administration of Exogenous Gonadotrophins in Dutch-Belted Rabbits

Maurer¹,

Hunt²,

Foote³

1968

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Repeated superovulation and in-vivo collection of ova were carried out with thirty does divided into three groups of ten does each. One group received fsh\p=m-\lh, a second group received pmsg\p=m-\hcg and the controls received only lh. Injections of fsh\p=m-\lh at three 16-week intervals followed by one 8-week interval resulted in 46\m=.\5,35\m=.\4,25\m=.\2 and 18\m=.\0ovulation points/doe. This decrease with time was significant (P<0\m=.\05).Corresponding values for the pmsg\p=m-\hcg group which, however, received fsh\p=m-\lhfor the final superovulation were 13\m=.\6,5\m=.\7, 6\m=.\2and 20\m=.\3.The lh controls averaged 7\m=.\8,7\m=.\0,5\m=.\1 and 5\m=.\6ovulation points. Overall treatment differences were highly significant (P<0\m=.\005). From the 1920 ovulation points 1593 ova (83%) were recovered, of which 83\m=.\1% were cleaved. Young born from unrecovered ova accounted for 3\m=.\1%.Control kindlings by the same does at regular periods resulted in normal litter size but in fewer does kindling as the experiment progressed. Results of two bio-assays for antihormones suggested that this decrease was due to hormonal refractoriness which was most pronounced in the pmsg\p=m-\hcg group.

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Section: Ovulation Points and Ova Recoveredmentioning

confidence: 48%

Repeated Superovulation Following Administration of Exogenous Gonadotrophins in Dutch-Belted Rabbits

Maurer¹,

Hunt²,

Foote³

1968

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“…The muscular activity of the ovarian bursa, which in the rabbit is formed by the upper and lower folds of the mesotubarium, may also be implicated. Hafez (1961) has reported that 10% of onecell eggs transferred to the bursae of synchronous pseudo-pregnant rabbits were recovered from the Fallopian tubes between 10 and 70 min. later.…”

Section: Percentage Ovulationmentioning

confidence: 98%

Ovulation in the Rabbit: The Time of Follicular Rupture and Expulsion of the Eggs, in Relation to Injection of Luteinizing Hormone

Harper¹

1963

Journal of Endocrinology

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Fifty-five mature oestrous does were injected intravenously with luteinizing hormone (LH) and subsequently killed between 9 hr. 52 min. and 14 hr. 30 min. after injection. At autopsy the number of freshly ruptured follicles was counted and was expressed as a percentage of the total number of follicles (ruptured and unruptured) counted, that had undergone pre-ovulatory swelling. This method of calculating 'percentage ovulation' gave results which agreed very closely with previously reported data. The calculation showed no ovulation by 10 hr., 50% ovulation between 10\ m=1/ 2\ and 103/4 hr., and 100% ovulation by 14 hr. after the injection of LH.In thirty-nine out of these fifty-five does a special study was carried out to determine in what position (in the ruptured follicle, on the surface of the ovary or in the Fallopian tube) the eggs from the ruptured follicles were recovered in relation to the time elapsing after LH injection. Between 10\ m=1/ 2\ and 11\ m=1/ 2\ hr. after injection about 17% of the eggs were found either still inside the ruptured follicle, or within the cumulus oophorus protruding from the follicle or adhering to the ovarian surface. However, at 11\m=1/2\-13 hr. after injection only 3\m=.\6-5\m=.\9% were still in the follicle or on the ovarian surface. From 13 hr. after LH injection all the eggs recovered were found in the Fallopian tube. These results suggest that not all the eggs are ejected from the follicle at the time of rupture, and that some appreciable time may elapse between follicular rupture and entry of eggs into the tube.

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“…These workers observed that not all the treated does would mate and that not all young does which mated after being primed with follicle-stimulating hormone (fsh) would ovulate and form functional corpora lutea. In many reports crude extracts and/or superovulation-priming-treatments plus sterile matings were used in addition to artificial insemination or natural matings, to obtain fertilized eggs (Adams, 1954(Adams, , 1956(Adams, , 1960Beatty, 1958;Chang, 1951Chang, , 1958Hafez, 1961). Kawakami & Sawyer (1959) have found encéphalographie changes following lh injection similar to those following coitus.…”

Section: Introductionmentioning

confidence: 99%

Ovulation Rates and Litter Sizes in Sexually Receptive and Nonreceptive Artificially Inseminated Rabbits Given Varying Dosages of Luteinizing Hormone

Foote¹,

Hafs²,

Staples³

et al. 1963

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At any one time a large proportion of individually caged, sexually mature female rabbits failed to copulate. Intravenous adminis¬ tration of purified pituitary luteinizing hormone (plh) (Armour) produced ovulations in sexually receptive and nonreceptive does alike. Does with histories of infertility ovulated after the injection of plh. The routine administration of 2-5 mg of plh to fifty-seven virgin and multiparous Dutch-Belted does averaging 2 to 3 kg, followed by artificial insemination, resulted in 91% of the does kindling and 307 young being born. Administration of either 0-5 mg or 1 mg of plh per kg to random members of fourteen pairs of does, accompanied by artificial insemina¬ tion, resulted in no difference between the number of ovulations or the number of young per treatment (>0•05). Fertility and litter size were normal when sixteen does were re-injected with plh and inseminated after weaning their previous litters.

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An experimental study of ova reception and some related phenomena in the rabbit

Cited by 5 publications

References 31 publications

Repeated Superovulation Following Administration of Exogenous Gonadotrophins in Dutch-Belted Rabbits

Repeated Superovulation Following Administration of Exogenous Gonadotrophins in Dutch-Belted Rabbits

Ovulation in the Rabbit: The Time of Follicular Rupture and Expulsion of the Eggs, in Relation to Injection of Luteinizing Hormone

Ovulation Rates and Litter Sizes in Sexually Receptive and Nonreceptive Artificially Inseminated Rabbits Given Varying Dosages of Luteinizing Hormone

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