A preliminary study on the effect of dietary supplementation with cod liver oil on the polyunsaturated fatty acid composition of boar semen |
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| Authors: | H. Paulenz O. Taugbøl P. O. Hofmo K. Saarem |
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| Affiliation: | (1) Department of Reproduction and Forensic Medicine, Norwegian College of Veterinary Medicine, POB 8146 Dep., 0033 Oslo;(2) Department of Biochemistry, Physiology and Nutrition, Norwegian College of Veterinary Medicine, POB 8146 Dep., 0033 Oslo;(3) Norwegian Pig Breeders Association, POB 2034 Haraldstad, 2301 Hamar;(4) Peter Möller avd. av ORKLA A.S., POB 25 Refstad, 0513 Oslo, Norway |
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| Abstract: | Eight mature Norwegian Landrace boars, of proven fertility and in routine semen production for AI, were fed individually with the same basic diet for 9 weeks. One group of 4 animals served as the control, the remaining 4 boars received a daily supplement of 75 ml cod liver oil (CLO-group). Fifteen consecutive semen samples were collected from each boar. The fatty acid composition of the semen was determined, and the content of the 15 most numerous fatty acids with a chain length longer than 12 carbon atoms was followed over time. In both groups, the proportion of 16:1n-7 decreased significantly, while 16:0 and 22:6n-3 (DHA) increased. By the end of the experiment, DHA had tended to increase and 22:5n-6 to decrease to a greater extent in the CLO-group. A significant difference between the groups was seen for onen-6 PUFA (22:4n-6), which remained unchanged in the control group but decreased in the CLO-group. No change was seen in docosapentaenoic acid (22:5n-3) and eicosapentaenoic acid (20:5n-3) was not found in any sample. These results indicate that CLO supplementation affects the fatty acid composition of boar semen. There were no significant differences in the non-return rates (4–25 days) between the two groups before, during or after the experiment.Abbreviations AA arachidonic acid - AI artificial insemination - area% each fatty acid percentage of the total area of the peaks from gas chromatographic analysis of methylated fatty acids - CLO cod liver oil - DHA docosahexaneoic acid - DPA docosapentaenoic acid - EPA eicosapentaenoic acid - LA linoleic acid - LNA linolenic acid - NR non-return rate - PUFA polyunsaturated fatty acid - Tc the temperature marking the beginning of the phase transitionFatty acid nomenclature: Example, 22:6n-3: 22=number of carbon atoms, 6=number of double bonds,n-3=position of the first double bond counted from the terminate (n or methyl end of the fatty acid chain |
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| Keywords: | boar cold shock cryopreservation fish oil non-return rate polyunsaturated fatty acid semen |
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