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Artificial insemination with doses containing low-sperm numbers has been utilized to optimize the use of elite bulls. Hen egg yolk is widely used as a cryoprotective agent in semen freezing extender protecting the spermatozoa. Its action is due to the presence of low-density lipoproteins (LDL) in the hen egg yolk. The objectives of the present study were to evaluate the effects of the semen dilution...
Glutamine has been used in the composition of semen extenders in several species, but never in the bull. The aim of our study is to demonstrate the cryoprotective role of glutamine for freezing bovine semen and to determine concentration of the latter to improve the motility and trajectory characteristics of spermatozoa. Three experiments were undertaken with 21 ejaculates from three different bulls...
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