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- W2114883994 abstract "The current use of ingredients of animal origin, such as egg yolk, in semen extenders presents a risk of microbial contamination, and has led to the search for alternatives. Such an extender is commercially available for bull semen (Bioexcell®, IMV, L’Aigle, France), and it has previously been tested in vitro for freezing ram semen, with satisfactory results. The aim of the present study was to compare the fertility results of ewes in Uruguay, after cervical insemination with ram semen that was frozen in Bioexcell® versus semen frozen in a conventional milk–egg yolk extender (control). Semen from five Corriedale rams was frozen, using a split sample design, in either milk–egg yolk or Bioexcell® extender, using a two-step extension method. The sperm parameters assessed after thawing were subjective motility, membrane integrity (SYBR-14/PI), and capacitation status (CTC). Thawed semen was inseminated intracervically once during spontaneous estrus in 970 Corriedale ewes that grazed in natural pastures, under extensive management conditions. Fertility was recorded as nonreturn rates at 21 days (NRR-21) and 36 days (NRR-36) after artificial insemination (AI), as well as pregnancy rate (PR-US, diagnosed ultrasonographically 50 days after AI of the last ewe). Subjective motility was slightly higher in Bioexcell® than in the milk extender (47 vs. 46.5%; NS), as was membrane integrity (38 vs. 37.7%; NS) and the percentage of uncapacitated spermatozoa (28.5 vs. 26.3%; NS). There were no statistically significant differences in fertility rates found between Bioexcell® and the control extender: NRR-21 (35.9 vs. 33.2%), NRR-36 (34.8 vs. 32.6%), and PR-US (28.4 vs. 27.2%). In conclusion, Bioexcell® appears to be an alternative to the conventional milk–egg yolk extender for freezing ram semen, and provides similar fertility results after cervical AI under extensive management conditions. Thus, Bioexcell®, containing no additives of animal origin, can offer a safer alternative when frozen semen is used for introducing new genetic material into a flock or a country." @default.
- W2114883994 created "2016-06-24" @default.
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- W2114883994 date "2003-03-01" @default.
- W2114883994 modified "2023-10-16" @default.
- W2114883994 title "Fertility of ram semen frozen in Bioexcell® and used for cervical artificial insemination" @default.
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- W2114883994 doi "https://doi.org/10.1016/s0093-691x(02)01178-0" @default.
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