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Low-density lipoproteins (LDL) have been previously isolated and identified as the cryoprotective fraction of yolk. The effect of LDL on sperm motility after freezing-thawing has been reported, but no study has been made to assess the effect of LDL on bull semen fertility. The aim of this study was to evaluate the fertility of bull semen cryopreserved in the presence of LDL. Motility of semen cryopreserved...
Hen egg yolk is widely used as a cryoprotective agent in semen freezing extenders in order to protect the spermatozoa against cold shock. The protective action of yolk is largely presumed to be due to low density lipoproteins (LDL). In recent years, arguments concerning the presence of cryoprotective antagonists in egg yolk, have reinforced interest in the use of only the LDL extracted from egg yolk...
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