Morphological development and sex of bovine in vitro‐fertilized embryos
Морфологическое развитие и пол эмбрионов крупного рогатого скота, оплодотворённых in vitro
1992-07-01
SCID: 54.1/4v7dmwn8
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blastocyst developmentbovine embryosembryo sex determinationin vitro fertilizationpolymerase chain reaction
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Abstract (AI)
Bovine in vitro-fertilized embryos at the blastocyst stage were collected at days 7, 8, and 10 postinsemination and sex was determined via the polymerase chain reaction (PCR) to compare the embryonic development with the sex of the embryos. The percentages of males (sex ratio) after division of the embryos into three developmental groups were 68%, 48%, and 35% in the fast, intermediate, and slow groups, respectively (P = 0.014). The percentages of males on days 7, 8, and 10 were 60%, 40% and 33%, respectively (P = 0.043). The average sex ratio for the whole material was 50%. It is thus concluded that male bovine preimplantation embryos develop faster than female embryos.
Key Findings
1
Bovine in vitro-fertilized blastocysts were sexed by PCR after collection on days 7, 8, and 10 postinsemination.
2
Male embryos were overrepresented among fast-developing embryos, comprising 68% versus 48% of intermediate and 35% of slow developers (P = 0.014).
3
The male proportion declined with collection day, from 60% on day 7 to 40% on day 8 and 33% on day 10 (P = 0.043).
4
The overall sex ratio was 50%, while developmental timing differed by sex, indicating that male bovine preimplantation embryos develop faster than female embryos.
Research Object
Bovine in vitro-fertilized preimplantation embryos at the blastocyst stage
Research Subject
The relationship between embryonic morphological/developmental rate and sex, specifically the faster development of male embryos than female embryos
Publication Details
Publication Date
1992-07-01
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