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ARTICLE |
1 Department of Animal Science, University of Wyoming, Laramie 82071
2 Department of Physiology, Colorado State University, Fort Collins 80523
* To whom correspondence should be addressed. E-mail: brethess{at}uwyo.edu.
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Abstract |
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Experimental objectives were to evaluate the influence of supplemental high-linoleate safflower seeds on fatty acid concentrations in plasma, medial basal hypothalamus, uterine tissues and serum 13,14-dihydro-15-keto PGF2
metabolite (PGFM) in primiparous beef cows during early lactation. Beginning 1 d postpartum, 18 primiparous, crossbred beef cows (411 ± 24.3 kg average BW) were fed Foxtail millet hay at 1.68% of BW (DM basis) and either a low-fat supplement (Control: 63.7% cracked corn; 33.4% safflower seed meal; and 2.9% liquid molasses; DM basis) at 0.35% of BW (n = 9) or a supplement (Linoleate) containing 95.3% cracked high-linoleate (79% 18:2n-6) safflower seeds and 4.7% liquid molasses (DM basis) at 0.23% of BW (n = 9). Diets were formulated to be isonitrogenous and isocaloric. The Linoleate diet contained 5.4% of DMI as fat versus 1.2% for Control. Starting 1 d postpartum, cattle were bled every 3 d for collection of serum and plasma. Cattle were slaughtered 37 ± 3 d postpartum for collection of the medial basal hypothalamus, myometrium, endometrium, caruncular tissue, intercaruncular tissue, and oviduct. Feeding Linoleate increased (P = 0.001) plasma concentrations of 18:2n-6, 18:2
cis-9 trans-11, and total unsaturated fatty acids; however, 18:1trans-11 did not differ (P = 0.19) between treatments. Concentrations of 20:5n-3 in the medial basal hypothalamus tended (P = 0.10) to be greater for cattle fed Linoleate. Concentrations of fatty acids in the oviduct were greater (P < 0.05) than in other uterine tissues. Cows fed Linoleate had greater (P = 0.05) concentrations of 18:3n-3 in the endometrium and less (P = 0.06) 18:2
cis-9 trans-11 in the myometrium than cows fed Control. Supplemental fat increased (dietary treatment x day postpartum, P = 0.01) concentrations of PGFM in serum more in Linoleate than Control cows from d 3 to 9 postpartum. Lipid supplementation early in the postpartum period altered the fatty acid composition of medial basal hypothalamus, uterine tissue and serum concentrations of PGFM. The most novel observation was that the oviduct appeared to be the most sensitive tissue to additional dietary linoleic acid and could potentially influence fertility.
Key Words: beef cattle, brain, fatty acids, linoleic acid, prostaglandin metabolite, uterine tissue
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