effects of dietary omega fatty acids on pregnancy rate, plasma prostaglandin metabolite levels, serum progesterone levels, and milk fatty-acid profile in beef cows

The objectives were to determine the effects of feeding supplements rich in omega-6 or omega-3 fatty acids (FA) during the late gestation to the early postpartum and breeding periods on reproduction and milk FA profile in beef cows. For each of two years, at the beginning of period 1 (mid-December),...

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Bibliographic Details
Published in:	Canadian journal of veterinary research Vol. 77; no. 4; pp. 314 - 318
Main Authors:	Richardson, Gavin F, McNiven, Mary A, Petit, Helene V, Duynisveld, John L
Format:	Journal Article
Language:	English
Published:	Canada Canadian Veterinary Medical Association 01-10-2013
Subjects:	Animals artificial insemination beef cows blood serum calving Cattle - metabolism dietary supplements Dinoprost - blood Fatty Acids, Omega-3 - analysis Fatty Acids, Omega-3 - metabolism Fatty Acids, Omega-6 - analysis Fatty Acids, Omega-6 - metabolism Female flax Flax - metabolism Glycine max - metabolism Immunoenzyme Techniques - veterinary Insemination, Artificial - veterinary linseed metabolites milk Milk - chemistry milk composition omega-3 fatty acids Postpartum Period Pregnancy pregnancy rate progesterone Progesterone - blood prostaglandins Random Allocation Short Communications soybeans
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Summary:	The objectives were to determine the effects of feeding supplements rich in omega-6 or omega-3 fatty acids (FA) during the late gestation to the early postpartum and breeding periods on reproduction and milk FA profile in beef cows. For each of two years, at the beginning of period 1 (mid-December), 72 beef cows, calving in January or February, were assigned to diets supplemented with roasted flaxseed (Flax) or roasted soybean (Soybean). For each of two years, after 11 wk (end of period 1), 18 cows of 36 in the Flax group were switched to the soybean supplement and 18 cows of 36 in the Soybean group were switched to the flax supplement (start of Period 2). Cows were bred by timed artificial insemination (TAI) in week 5 of period 2. The FA composition of the milk reflected the FA profile of the oilseed supplements. There were no differences in pregnancy rates among the 4 groups. The treatments had no effect on plasma prostaglandin metabolite levels or ratios at 4 to 11 d postpartum. At 5 to 6 d post- TAI, pregnant cows fed Flax in period 1 had lower (P < 0.05) plasma prostaglandin F metabolite (PGFM) levels and PGFM to prostaglandin E metabolite (PGEM) ratio than cows fed Soybean, but there were no significant differences at 19 to 20 d post-TAI. Cows pregnant from TAI and fed Flax in period 2 had higher (P < 0.05) serum progesterone levels at 5 to 6 d post-TAI than cows fed Soybean, but there was no difference at 19 to 20 d post-TAI. The dietary treatments had no effect on pregnancy rates, but there were some effects on plasma PGFM levels, PGFM to PGEM ratios, and serum progesterone levels. The FA supplements influenced the FA composition of milk.
Bibliography:	http://www.ncbi.nlm.nih.gov/pubmed/24124276 0830-9000(20131001)77:4L.314;1-
ISSN:	0830-9000 1928-9022