Asymmetric distribution of male and female foetuses in the pregnant rabbit uterus

Younglai, Edward V.; Pan, Cristiana; Bhavnani, Bhagu R.

doi:10.1007/bf01967925

Cited by 8 publications

(3 citation statements)

References 5 publications

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“…The sex ratio of calves gestated in the right horn was significantly higher than the sex ratio of left-horn-gestated calves. These results were consistent with those previously reported for the mouse and Mongolian gerbil [2,30], but were the reverse of the fetal sex ratio distribution observed in the uterus of the rabbit [1].…”

Section: Discussionsupporting

confidence: 94%

“…In addition, the sexually dimorphic developmental inequalities previously reported were encountered in these experiments. Similarly, these data compare favorably with laterally asymmetric sex ratio distributions reported in the rabbit [1], mouse [2,36], and Mongolian gerbil [11,30,37] and those detected in the other experiments of this study. However, the mechanism underlying the difference in the sex ratio distortion found in IVF-derived embryos generated in oocytes from the left but not from the right ovary remains unknown.…”

Section: Discussionsupporting

confidence: 90%

“…An excess of female fetuses has been reported in the right uterine horn of the rabbit, while in the mouse and Mongolian gerbil [1][2][3] an excess of male fetuses in the right horn has been observed.…”

Section: Introductionmentioning

confidence: 92%

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Sex Ratio of Bovine Embryos and Calves Originating from the Left and Right Ovaries1

Hylan

Giraldo

Carter

et al. 2009

Biology of Reproduction

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An asymmetric distribution of the sexes within the left and right uterine horns has been described in multiple species. A series of experiments were conducted to evaluate the sex ratio (% male) of calves gestated in the left and right uterine horns, as well as the sex ratio of embryos originating from the left and right ovaries of cattle. The sex ratio of calves gestated in the right uterine horn of naturally mated cows was significantly higher compared with the sex ratio of calves gestated in the left uterine horn. In addition, the sex ratio of the left and right uterine horns differed significantly from parity. The sex ratio of embryo transfer calves born following transfer to the left and right uterine horns was not significantly different. Additionally, the proportion of male embryos collected from the right uterine horns was significantly greater than from the left uterine horns of superovulated cows. The sex ratio of embryos collected from the left and right uterine horns of unilaterally ovariectomized cows was not significantly different. However, more female than male embryos were produced when left ovary oocytes fertilized in vitro. In conclusion, the results of these experiments demonstrate that a significantly greater proportion of males are gestated in the right uterine horn of cattle and a greater proportion of females in the left. Additionally, the data indicate that sex-specific selection pressure may be applied to embryos by ovarian factors rather than by the uterine environment.

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Section: Discussionsupporting

confidence: 94%

Section: Discussionsupporting

confidence: 90%

See 1 more Smart Citation

Sex Ratio of Bovine Embryos and Calves Originating from the Left and Right Ovaries1

Hylan

Giraldo

Carter

et al. 2009

Biology of Reproduction

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Distribution by sex of mouse fetuses in the intrauterine position

1987

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We examined whether or not the sex of the fetuses of polytocous animals distributes randomly in the position along the uterine horn in 255 mouse litters. The fetal sex ratio did not differ significantly among the three intrauterine segments (ovarian, middle, and cervical). Based on the number of fetuses examined in this study, it can be stated that even if sex ratio differences exist among the segments, the ratio in individual segments would fall mostly inside the +/- 0.1 range, when the overall sex ratio (M/(M + F] is around 0.5.

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Effects of induced ovulation by pregnant mare's serum and human chorionic gonadotropin on the sex ratio of mouse fetuses

Sakai

Endo

1987

Gamete Research

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The sex ratio of the fetuses from mice treated with pregnant mare's serum (PMS)/human chorionic gonadotropin (HCG) to induce ovulation did not differ appreciably from that of spontaneously ovulated controls. Rather, an intriguing observation was that the sex ratio in the right uterine horns tended to be lower than that in the left horns in both spontaneously ovulated controls and PMS/HCG-treated groups. We speculate on its possible relation to the observed right-left asymmetry of horn sizes (number of fetuses in the horn).

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Asymmetric distribution of male and female foetuses in the pregnant rabbit uterus

Cited by 8 publications

References 5 publications

Sex Ratio of Bovine Embryos and Calves Originating from the Left and Right Ovaries1

Sex Ratio of Bovine Embryos and Calves Originating from the Left and Right Ovaries1

Distribution by sex of mouse fetuses in the intrauterine position

Effects of induced ovulation by pregnant mare's serum and human chorionic gonadotropin on the sex ratio of mouse fetuses

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