Effects of boar sperm antioxidant supplementation on fertility.

Use of cooled stored boar semen for artificial insemination accounts for 99% of inseminations in pork production sectors worldwide. The aim of the present study was to examine use of GameteGuard®-CP, a natural plant derived blend of antioxidants, supplemented in one commercially available semen extender on sperm quality, conception rate, farrowing rate, and litter size. Ejaculates from 16 commercial Duroc boars were used in a split-ejaculate single-sire artificial insemination study. Sperm were evaluated for motility, viability, acrosome integrity, membrane stability, mitochondrial membrane potential, DNA intactness, and total antioxidant reactivity on both day 1 and 4 subsequent to ejaculate collection. Sows were inseminated after a treatment regimen was imposed to synchronize time of ovulation (n = 1476) among females using sperm collected 4 days subsequent to ejaculate collection extended in AndroStar Plus® or GameteGuard®-CP supplemented extender. At day 4 post-ejaculate collection, there was maintenance of sperm viability, membrane stability, acrosome intactness, mitochondrial membrane potential, and DNA intactness (P < 0.01) when there was use of GameteGuard®-CP treatments. When control samples were used, there were lesser (P < 0.01) values from day 1-4 for all variables evaluated. Conception rate and farrowing rates were 7.4% and 9.7% greater, respectively (P < 0.05), but there was no difference as a result of GameteGuard®-CP-treatment in mean litter outcomes. The results in the present study indicate antioxidant supplementation using GameteGuard®-CP maintains sperm quality during cool sperm storage resulting in improved conception and farrowing rates when using semen stored in the cooled state for as long as 4 days.

Shotgun proteome analysis of seminal plasma differentiate boars by reproductive performance.

There is a need to identify subfertile boars before they enter into the breeding herd. Seminal plasma proteins are essential for normal sperm function and transport and play an important role in fertilization. The objective of this study was to use liquid chromatography tandem mass spectrometry for shotgun proteome analysis to investigate whether differences in boar fertility phenotype can be differentiated by seminal plasma protein abundance. Following 50 breedings, boars were categorized into one of four phenotypes: high farrowing rate and total born (HFHB; n = 9), high farrowing rate with low total born (HFLB; n = 10), low farrowing rate and total born (LFLB; n = 9), and low farrowing rate with high total born (LFHB; n = 4) that were distinct (p < 0.05) from each other by these variables. There were 506 proteins measured in at least one sample across all animals. There were 245 high confidence proteins and 56 were differentially abundant between the high fertility phenotype (HFHB) and at least one of the three subfertile groups. Findings support that seminal plasma protein profiles are distinct between boars with different fertility phenotypes.