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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 352374
Title Effects of insemination-ovulation interval on fertilization rates and embryo characteristics in dairy cattle
Author(s) Roelofs, J.B.; Graat, E.A.M.; Mullaart, E.; Soede, N.M.; Voskamp-Harkema, W.; Kemp, B.
Source Theriogenology 66 (2006)9. - ISSN 0093-691X - p. 2173 - 2181.
Department(s) Adaptation Physiology
Quantitative Veterinary Epidemiology
Publication type Refereed Article in a scientific journal
Publication year 2006
Keyword(s) artificial-insemination - accessory sperm - bovine oocytes - time - cows - fertility - quality - estrus - spermatozoa - morphology
Abstract The objective of this study was to examine effects of the interval between insemination and ovulation on fertilization and embryo characteristics (quality scored as good, fair, poor and degenerate; morphology; number of cell cycles and accessory sperm number) in dairy cattle. Time of ovulation was assessed by ultrasonography (every 4 h). Cows were artificially inseminated once between 36 h before ovulation and 12 h after ovulation. In total 122 oocytes/embryos were recovered 7 d after ovulation. Insemination¿ovulation interval (12 h-intervals) affected fertilization and the percentages of good embryos. Fertilization rates were higher when AI was performed between 36¿24 and 24¿12 h before ovulation (85% and 82%) compared to AI after ovulation (56%). AI between 24 and 12 h before ovulation resulted in higher percentages of good embryos (68%) compared to AI after ovulation (6%). Insemination¿ovulation interval had no effect on number of accessory sperm cells and number of cell cycles when corrected for embryo quality. This study showed that the insemination¿ovulation interval with a high probability of fertilization is quite long (from 36 to 12 h before ovulation). However, the insemination¿ovulation interval in which this fertilized oocyte has a high probability of developing into a good embryo is shorter (24¿12 h before ovulation).
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