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Dietary rice improves growth performance, mucosal enzyme activities and plasma urea nitrogen in weaning piglets.

In this study, we evaluated the nutritional functions of rice for weaning piglets. Sixteen weaning piglets with an average initial weight of 7.2 kg were divided into two groups. One group was fed a corn-soybean meal based diet, and the other was fed a rice-soybean meal based diet, containing 50% corn and rice, respectively. A 2 weeks growth trial was conducted and growth performance, intestinal mucosal enzyme activities and plasma urea nitrogen were measured. The average daily gain in rice-fed piglets was significantly higher than that in corn-fed piglets and the average daily feed intake tended to be higher in rice-fed piglets than in corn-fed piglets. Maltase and aminopeptidase activities (mol/g tissue) in the jejunum in rice-fed piglets were significantly higher than those in corn-fed piglets, although these enzyme activities were not different in the duodenum. Sucrase and dipeptidyl peptidase IV activities in the two groups were not different in either the duodenum or jejunum. Although the feed (nitrogen) intake was higher in rice-fed piglets, the plasma urea nitrogen in rice-fed piglets was significantly lower (P = 0.006) than that in corn-fed piglets. These results indicate that rice is a good alternative feedstuff for the diet of weaning piglets.

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