Comparison between Impact of Trans-Fatty Acids and Omega on Endometrial Prostaglandin Biosynthesis and Fertility in Dairy Cattle

The objectives were to evaluate the effects of source of fatty acids (FA) on embryo quality of dairy cows. Ten Holstein cows(A) were assigned randomly to of sources of FA supplemented at %2 of the dietary dry matter as calcium salts of either palm oil (PO) or linoleic and trans-octadecenoic acids (LTFA). Ten cows were (B) fed oil flax as Omega like (A), from 25 prepartum to 80 in milk (DIM) for and B. Cows were presynchronized beginning at 30 DIM. Then they subjected to the Ovsynch protocol beginning on 39 postpartum. Timed artificial insemination was performed 12 after the final GnRH of the Ovsynch protocol with semen from single sire of proven fertility. The uteri of cows were nonsurgically flushed at after artificial insemination for collection of embryos-oocytes. Ovaries were examined by ultrasonography throughout the synchronization protocol. Blood was sampled and plasma was analyzed for concentrations of metabolites and hormones. The body condition score and yields of milk and milk components were measured throughout the first 90 DIM. Treatment did not affect concentrations of nonesterified FA, β-hydroxybutyrate, glucose, and progesterone in plasma. Body condition was similar between treatments. Milk production was similar between treatments, but concentrations of fat in milk and yields of fat and 3.5% fat-corrected milk decreased in cows fed LTFA and 3% increase in cows fed Omega ,3 whereas concentration of true protein increased. Source of dietary FA did not influence ovulatory responses, diameter of the ovulatory follicle, and diameter of the corpus luteum during synchronization but in group these scales were improved. Fertilization tended to increase in cows, first cows fed flax oil second LTFA then cows fed PO. Feeding LTFA improved the proportion of excellent-, good-, and fair-quality embryos, and embryos from cows fed LTFA had greater number of blastomeres than embryos from cows fed PO. Feeding more unsaturated source of FA improved fertilization and embryo development in lactating dairy cows, despite similar indicators of metabolic status. These results recommended that reproduction will be improved by feeding dairy cows with source of Omega3 and may be valid for other farm animals even for humans .This study confirmed the role of veterinary to resolve research and medicine problems

کلیدواژه ها:

embryo quality ، fatty acid ، omega 3 ، reproduction ، dairy cow