Added to the sperm morphology that did not differ among the groups, this suggests that such temperatures promote damage to the apparatus responsible for motility in collared peccaries sperm, but the functional structure of the cell remains unaltered. In conclusion, we promote an improvement in the semen cryopreservation protocol by recommending the use of a fast freezing

curve that reduces the time spent on the procedure. Also, collared peccaries semen can be packaged both in 0.25 mL or 0.50 mL straws, but the thawing should be conducted at 37 °C/1 min. “
“Conjugated linoleic acid (CLA) is the nomenclature used to define a group of isomers of octadecadienoic acid with double conjugated bonds, that are most abundant in positions 9, 10, 11, and 12, and can be naturally found see more in dairy products and ruminant’s meat in both cis and trans configurations [15] and [26]. CLA, just as essential fatty acids (linoleic and

linolenic acids), and other polyunsaturated fatty acids, are known for changing the lipid membrane composition in many cells [20]. These fatty acids can be incorporated by the plasma membrane of the cells [1] and [19] provoking modification in its structure and function [21] and [27]. The effects of fatty acids incorporated in maturation and embryonic cultivation media over membrane fluidity of bovine embryos were reported [9]. An increase of unsaturated fatty acids in the embryonic membrane was observed before freezing, resulting in the modification of membrane fluidity, which may improve the embryo ability to freezing [24]. In Selleckchem GKT137831 ovine semen, the addition of Cyclooxygenase (COX) oleic-linoleic acids to the cryopreservation medium resulted a beneficial effect in the preservation of sperm cells viability [18]. Swine spermatozoa incubated for 4 h at 37 °C in a dilution media containing oleic and linoleic acids demonstrated a significant improvement in motility and viability [10]. The use of linoleic acid in the bovine semen cryopreservation medium caused an improvement in sperm

motility after thawing, relating this result to a possible maintenance in membrane fluidity due to the incorporation of linoleic acid by the lipid bilayer [22]. The composition of the extender and the type and the amount of cryoprotectants may have differential effects depending on the species or breed [23]. Thus, it is important to investigate the effect of specific compositions on specific semen samples. The effects of CLA addition to dilution and freezing media used for bovine semen and its interaction with sperm cells have not been reported. The objective of this study was to evaluate sperm motility parameters and the integrity of plasma, acrosomal and mitochondrial membranes of bovine spermatozoa frozen in media containing different concentrations of cis-9,trans-11 and trans-10,cis-12 isomers of the conjugated linoleic acid (CLA).