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- W2051541330 abstract "We determined the relative importance of cholecystokinin (CCK), leptin, and fatty acid concentrations in plasma in mediating the satiety effects of supplemental fat in lactating cows. Five ruminally and duodenally cannulated Holstein cows in late lactation were used in a 3×5 incomplete Latin square design with three treatments: 1) Control: basal diet (CON), 2) Control+supplementation of canola oil at 1 kg/d in the feed (FED) and 3) Control+abomasal infusion of canola oil at 1 kg/d (INF). Relative to CON, feed intake was reduced by INF but not by FED. We provide evidence that both FED and INF treatments stimulated CCK gene expression in the duodenum and elevated plasma CCK concentrations. However, our results did not support a role for CCK in mediating satiety through an endocrine mechanism of action. We speculate that CCK might be acting either through paracrine and/or neurocrine routes to influence feed intake in cattle. Both FED and INF had no effect on the mRNA abundance of leptin, lipoprotein lipase, or acetyl-CoA carboxylase in adipose tissue. Plasma concentrations of leptin, insulin and IGF-I were not altered by FED or INF, indicating that these signals may not be involved in mediating short-term hypophagic effects of dietary fat. Plasma concentrations of 18[ratio ]1 n -9 and 18[ratio ]2 n -6 were significantly greater for INF than for FED or CON. We conclude that the hypophagic effects of supplemental fat in cattle depend on the amount of unsaturated fatty acids reaching the intestine and that this satiety effect is mediated through CCK, oleic acid and (or) linoleic acid, but leptin is not involved." @default.
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- W2051541330 date "2004-07-23" @default.
- W2051541330 modified "2023-10-17" @default.
- W2051541330 title "Effects of feeding or abomasal infusion of canola oil in Holstein cows. 2. Gene expression and plasma concentrations of cholecystokinin and leptin" @default.
- W2051541330 doi "https://doi.org/10.1017/s0022029904000299" @default.
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