Research findings for supplementing boar stud diets with fish oils are inconsistent. This study was designed to address three possible causes of performance variation of boars to fish oil supplementation: stability of...Research findings for supplementing boar stud diets with fish oils are inconsistent. This study was designed to address three possible causes of performance variation of boars to fish oil supplementation: stability of the fatty acid source, level of inclusion and breed of boars tested. Three groups of 87 boars each, from two genetic lines (PIC 337 and PIC 800), were assigned to treatment based on age, mean sperm production (previous 12 weeks), and body condition score. All boars received a corn-soybean meal diet with a commercial fish oil supplement providing 1.83</span><span style="font-family:""> </span><span style="font-family:Verdana;">g/boar/day of docosahexaenoic acid (DHA) as a preconditioning diet. On 10-Aug., 2020, the DHA source was changed to a stabilized starch imbedded source of refined fish oil (Salmate®), providing 1.83</span><span style="font-family:""> </span><span style="font-family:Verdana;">g/b/d for </span><span style="font-family:Verdana;">the </span><span style="font-family:Verdana;">test diet. Two additional levels providing 2.38 and 2.94</span><span style="font-family:""> </span><span style="font-family:Verdana;">g/b/d of DHA were fed for a 9 week pretreatment period and during the test period. Salmate® fed at 2.38</span><span style="font-family:""> </span><span style="font-family:Verdana;">g/b/d of DHA resulted in a reduction in the number of rejected ejaculates (P</span><span style="font-family:""> </span><span style="font-family:Verdana;"><</span><span style="font-family:""> </span><span style="font-family:Verdana;">0.045) by 7.5% and 6.4% compared to the lowest and highest inclusion rates, respectively. There w</span><span style="font-family:Verdana;">ere</span><span style="font-family:Verdana;"> no treatment</span><span style="font-family:Verdana;">s</span><span style="font-family:Verdana;"> by genetic line interactions. A retrospective study of semen production and quality of 77 boars on the Salmate® diet containing 1.83</span><span style="font-family:""> </span><span style="font-family:Verdana;">g/b/d DHA was done to compare to the original source of DHA at the same inclusion level. There were no differences in semen quality parameters between the 2 lipid sources. Ejaculate volume increased from 177.9 ml to 233.4 ml (P</span><span style="font-family:""> </span><span style="font-family:Verdana;"><</span><span style="font-family:""> </span><span style="font-family:Verdana;">0.001) and total sperm cells per ejaculate increased from 69.7 </span><span style="font-family:""><span style="font-family:Verdana;">×</span><span style="font-family:Verdana;"> 10<sup></span></span><span style="font-family:Verdana;">9</span><span style="font-family:Verdana;"></sup> to 82.0 </span><span style="font-family:""><span style="font-family:Verdana;">×</span><span style="font-family:Verdana;"> 10<sup></span></span><span style="font-family:Verdana;">9</span><span style="font-family:Verdana;"></sup> (P</span><span style="font-family:""> </span><span style="font-family:Verdana;"><</span><span style="font-family:""> </span><span style="font-family:Verdana;">0.001) due to substitution of Salmate®. Adding Salmate® at 2.38 g/b/d resulted in a lower number of rejected ejaculates per boar by 7.5% and 6.4% vs. 1.83 and 2.94 g/b/d, respectively, and boars fed Salmate® at 1.83 g/b/d produced 17% more doses than the competing product.展开更多
This study evaluated the relationship between serum L-carnitine level and sperm parameters in young boars. Serum L-carnitine and semen characteristics were determined for 61 young Duroc boars between the ages of 590 a...This study evaluated the relationship between serum L-carnitine level and sperm parameters in young boars. Serum L-carnitine and semen characteristics were determined for 61 young Duroc boars between the ages of 590 and 630 days. Multiple linear regression analysis was performed to predict total and progressive motility and the total number of spermatozoa based on serum total L-carnitine and free L-carnitine levels. Total number of spermatozoa was not associated with basal serum L-carnitine levels. A regression equation was found in which both total L-carnitine levels and free L-carnitine levels were significant predictors of total and progressive motility (P 0.05). These results suggest that serum L-carnitine level is an important selection parameter for stock boars.展开更多
文摘Research findings for supplementing boar stud diets with fish oils are inconsistent. This study was designed to address three possible causes of performance variation of boars to fish oil supplementation: stability of the fatty acid source, level of inclusion and breed of boars tested. Three groups of 87 boars each, from two genetic lines (PIC 337 and PIC 800), were assigned to treatment based on age, mean sperm production (previous 12 weeks), and body condition score. All boars received a corn-soybean meal diet with a commercial fish oil supplement providing 1.83</span><span style="font-family:""> </span><span style="font-family:Verdana;">g/boar/day of docosahexaenoic acid (DHA) as a preconditioning diet. On 10-Aug., 2020, the DHA source was changed to a stabilized starch imbedded source of refined fish oil (Salmate®), providing 1.83</span><span style="font-family:""> </span><span style="font-family:Verdana;">g/b/d for </span><span style="font-family:Verdana;">the </span><span style="font-family:Verdana;">test diet. Two additional levels providing 2.38 and 2.94</span><span style="font-family:""> </span><span style="font-family:Verdana;">g/b/d of DHA were fed for a 9 week pretreatment period and during the test period. Salmate® fed at 2.38</span><span style="font-family:""> </span><span style="font-family:Verdana;">g/b/d of DHA resulted in a reduction in the number of rejected ejaculates (P</span><span style="font-family:""> </span><span style="font-family:Verdana;"><</span><span style="font-family:""> </span><span style="font-family:Verdana;">0.045) by 7.5% and 6.4% compared to the lowest and highest inclusion rates, respectively. There w</span><span style="font-family:Verdana;">ere</span><span style="font-family:Verdana;"> no treatment</span><span style="font-family:Verdana;">s</span><span style="font-family:Verdana;"> by genetic line interactions. A retrospective study of semen production and quality of 77 boars on the Salmate® diet containing 1.83</span><span style="font-family:""> </span><span style="font-family:Verdana;">g/b/d DHA was done to compare to the original source of DHA at the same inclusion level. There were no differences in semen quality parameters between the 2 lipid sources. Ejaculate volume increased from 177.9 ml to 233.4 ml (P</span><span style="font-family:""> </span><span style="font-family:Verdana;"><</span><span style="font-family:""> </span><span style="font-family:Verdana;">0.001) and total sperm cells per ejaculate increased from 69.7 </span><span style="font-family:""><span style="font-family:Verdana;">×</span><span style="font-family:Verdana;"> 10<sup></span></span><span style="font-family:Verdana;">9</span><span style="font-family:Verdana;"></sup> to 82.0 </span><span style="font-family:""><span style="font-family:Verdana;">×</span><span style="font-family:Verdana;"> 10<sup></span></span><span style="font-family:Verdana;">9</span><span style="font-family:Verdana;"></sup> (P</span><span style="font-family:""> </span><span style="font-family:Verdana;"><</span><span style="font-family:""> </span><span style="font-family:Verdana;">0.001) due to substitution of Salmate®. Adding Salmate® at 2.38 g/b/d resulted in a lower number of rejected ejaculates per boar by 7.5% and 6.4% vs. 1.83 and 2.94 g/b/d, respectively, and boars fed Salmate® at 1.83 g/b/d produced 17% more doses than the competing product.
文摘This study evaluated the relationship between serum L-carnitine level and sperm parameters in young boars. Serum L-carnitine and semen characteristics were determined for 61 young Duroc boars between the ages of 590 and 630 days. Multiple linear regression analysis was performed to predict total and progressive motility and the total number of spermatozoa based on serum total L-carnitine and free L-carnitine levels. Total number of spermatozoa was not associated with basal serum L-carnitine levels. A regression equation was found in which both total L-carnitine levels and free L-carnitine levels were significant predictors of total and progressive motility (P 0.05). These results suggest that serum L-carnitine level is an important selection parameter for stock boars.