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Effect of fish meal supplementation on plasma and endometrial fatty acid composition in nonlactating beef cows^1,2

P. D. Burns^*,3, T. E. Engle^*, M. A. Harris, R. M. Enns^* and J. C. Whittier^*

^* Department of Animal Sciences and and Department of Food Science and Human Nutrition, Colorado State University, Fort Collins 80523

³ Correspondence: 208B Animal Sciences (phone: 970-491-6649; fax: 970-491-5326; E-mail: pburns{at}ceres.agsci.colostate.edu).

Seven nonlactating mature Angus cows (4 to 10 yr old) were used to examine the effects of fish meal supplementation on plasma and endometrial fatty acid composition. Cows were fed a corn silage-based diet supplemented with either fish meal, a rich source of the n-3 fatty acids, eicosapentaenoate and docosahexaenoate (n = 3; 5.1% of dietary DM), or corn gluten meal (n = 4; 8.5% of dietary DM) for approximately 64 d. Cows were given 25 mg of PGF₂ (i.m.) on d 11 and 25 of supplementation to synchronize estrous cycles. On d 18 postestrus of the second estrous cycle, cows were slaughtered, and caruncular endometrium was dissected from uteri immediately after slaughter. Jugular blood samples were collected immediately before supplementation was initiated (d 0) and at 7-d intervals for 35 d of the study. Plasma eicosapentaenoic and docosahexaenoic acids did not differ between treatment groups on d 0 (P > 0.10); however, these fatty acids were greater in cows supplemented with fish meal over the first 35 d of supplementation compared with cows supplemented with corn gluten meal (P < 0.05). Endometrial docosahexaenoic acid did not differ (P = 0.12), whereas eicosapentaenoic acid was greater (P < 0.05) in cows supplemented with fish meal than in cows supplemented with corn gluten meal. These results indicate that dietary fish meal alters plasma and endometrial n-3 fatty acid composition in beef cows.

Key Words: Cows • Docosahexaenoic Acid • Eicosapentaenoic Acid • Fish Meal • Uterus

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