Substituting barley by sorghum enhances efficiency of starch and protein utilization in lambs
Use of cereal grains with starch of different degradation rates allows for a more synchronized release of energy and N to prevent a rapid drop in rumen pH and increase outflow of ruminal starch for more efficient digestion in the small intestine (Abramson et al., 2005). Yahaghi et al. (2012) reported that partially substituting barley by sorghum significantly increased growth rate of lambs because of increased outflow of starch to the intestine and higher microbial-N (MN) yield. However, when barley was completely replaced by sorghum, high proportion of the intestinal starch was undigested (unpublished data). This follow-up study examined whether extrusion can increase the digestibility of sorghum starch in the intestine to allow for a higher substitution of barley by sorghum in lambs. The optimal extrusion condition for sorghum grain (Bicolor L. Moench) was prior-determined as 150 °C/55 bars pressure.
KeywordsIncrease Growth Rate Digesta Sample Efficient Digestion Complete Randomize Design Synchronize Release
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