Abstract
ABSTRACT The objective of this study was to evaluate the effects of the inclusion of flaxseed in the diet of male goats on the resistance of semen to the cryopreservation process. Sixteen males were distributed in four groups and fed a diet supplemented with 0, 4, 8, and 12% of flaxseed for a period of 60 days. Only the ejaculates that presented motility and vigor above 70% and 3, respectively, were sent through the cryopreservation process. After thawing, the semen was evaluated through thermo resistance, hypoosmotic, and acrossomal integrity tests. The data were submitted to analysis of variance and regression at 5% of significance. There was positive quadratic behavior for motility after 60, 120, and 180 min in the thermoresistance test (TTR), and positive quadratic behavior for sperm vigor after thawing after 120 and 180 min in the TTR (P < 0.05). However, negative quadratic behavior was obtained for plasma membrane integrity according to the hypoosmotic test (P < 0.05) and there was a difference in the acrosomal integrity test, presenting an optimum maximum level of 3.25% of flaxseed for acrosomal integrity of 65.83% (P < 0.05). The results obtained demonstrated that the addition of as much as 12% of flaxseed to the diet of goat breeders improved post-thawing sperm quality.
Highlights
IntroductionMost goat artificial insemination programs have been conducted using fresh or cooled semen
For many years, most goat artificial insemination programs have been conducted using fresh or cooled semen
It is believed that dietary supplementation with energy sources can positively assist the cryopreservation process, because, according to Pimentel et al (2005), the omega-3 fatty acid intake promotes structural and functional changes in the phospholipid membrane, and increases the cell membrane fluidity, allowing greater protein mobility, and favoring greater transduction signal exchange, hormonereceptor interaction, and substrate transport between intra- and extracellular media
Summary
Most goat artificial insemination programs have been conducted using fresh or cooled semen. It is believed that dietary supplementation with energy sources can positively assist the cryopreservation process, because, according to Pimentel et al (2005), the omega-3 fatty acid intake promotes structural and functional changes in the phospholipid membrane, and increases the cell membrane fluidity, allowing greater protein mobility, and favoring greater transduction signal exchange, hormonereceptor interaction, and substrate transport between intra- and extracellular media. In this sense, flaxseed is an excellent source of polyunsaturated fatty acids (PUFAs) and a possible alternative to increase reproductive rates. The objective of the study was to evaluate the effects of the inclusion of flaxseed in the diet of male goats on the resistance of semen to the cryopreservation process
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