Abstract
Three dairy heifers received intraperitoneal infusions (one liter) of the following solutions in a 3×3 Latin-square-designed trial: (I) 0.9% sodium chloride (control); (II) 5.4% glucose; (III) 25% glucose. The heifers were fed a completely pelleted ration (60% alfalfa meal, 40% ground corn) ad libitum once daily for a 3-hr period, and the infusions were given immediately before food was offered. The food consumption for Treatments I, II, and III was 62.6, 71.6, and 72.1 g/BWkg.73, and jugular blood glucose concentration 1 hr after feeding was 50.5, 57.2, and 69.2mg per 100ml, respectively. It was concluded that the glucostatic mechanism for food intake regulation is not important in ruminants.Isocaloric amounts of acetate, propionate, butyrate, and a A7FA mixture (60, 20, and 20% of the calories from acetate, propionate, and butyrate, respectively) were infused intraruminally into two cows fed a pelleted ration (75% alfalfa meal, 25% ground corn) and two cows fed a good-quality alfalfa hay. The rations were fed ad libitum from 10 am to 1 pm and from 4:30 pm to 8 am. Three consecutive days of water infusion (control) preceded three days of metabolite infusion. The infusions were given from 8 am to 1 pm each day, and the level of metabolite infused was equivalent to 15% of the estimated digestible energy requirement of the animals. The infusion of acetate, propionate, and the VFA mixture reduced (P<.05) the voluntary consumption of the pelleted ration during the 10 am to 1 pm feeding interval. Propionate and butyrate infusion caused a significant (P<.05) reduction in the consumption of hay in the 10 am to 1 pm feeding interval. It was concluded that acetate, propionate, and butyrate can act as satiety signal compounds in the regulation of food intake. Blood and rumen metabolites were examined, and the possible mechanism of action of these metabolites in causing satiation was discussed.
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