Influence of genetics and convervation methods on the quality of swine semen
Keywords:
Extenders, Artificial insemination, Genetic improvement, Swine farmingAbstract
The market demand promoted the genetic improvement in swine farming characterized by the crossing between different strains and breeds to make possible the use of heterosis. This accelerated improvement occurred due to artificial insemination and semen manipulation, associated with the use of extenders and refrigeration techniques. Therefore, this review aims to compile knowledge about the genetic influence and conservation methods on the quality of swine semen, besides to discussing the composition and efficiency of the main extenders and cryoprotectants intended for sperm conservation in this species. Initially, animals were selected based on productive traits such as maternal ability, carcass quality, and performance. However, male fertility, characterized by sperm quality and libido, is extremely important for the swine industry as it determines the productive potential of the herd indirectly. Evidences demonstrates that sperm parameters are influenced by genetics, with each race standing out in certain seminal trait. In addition, the management, age, feeding, seasonality, the intrinsic characteristics of the sperm cell, and the methods of ejaculate conservation also determine its viability. Despite being recommended due to its easy execution and excellent results, refrigerated semen has the excessive production of reactive oxygen species as a limiter. Likewise, the ejaculate freezing promotes sperm changes due to heat shock. Therefore the use of suitable extenders and cryoprotectants that allow the long-term maintenance of sperm viability is essential for both processes.
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