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Effects of Varying Levels of Flaked Corn Starch Abomasally Infused on Nitrogen Retention and the Efficiency of Energy Conversion in Fattening Steers |
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F. C. Li, Y. L. Feng, Z. H. Wang, H. Lin |
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| Abstract |
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The experiment was carried out to evaluate the effect of varying levels of flaked corn abomasally infused on energy metabolism and nitrogen metabolism in fattening steers. The starch levels of flaked corn of abomasally infused were 0, 300, 600 and 900 g/d. Four mature fattening steers fitted with permanent abomasum cannulas were allocated to a 4횞4 Latin square design were fed at 1.2 maintenance requirement a basal diet of Chinese wildrye (Aneurolepidium Chinense). Compared with 0 g/d (control group), digestible nitrogen, retention nitrogen (RN, g/d) and the efficiency of digestible nitrogen converted into retention nitrogen (RN/DN, %) of 300, 600 and 900 g/d groups were higher (p<0.05). The post-ruminal starch digestion of flaked corn were 71.36, 80.27 and 64.71% when the amounts abomasally infused were 300, 600 and 900 g/d, respectively. When the amount of starch abomasally infused was more than 600 g/d, the post-ruminal digestion of starch decreased. 300, 600 and 900 g/d starch infusion groups showed higher metabolizable energy intake (ME) and net energy gains (NEg, MJ/d) than the control group, and the efficiencies of metabolizable energy converted into body weight (Kf, %) of these groups were higher than the control group by 38.31, 73.18 and 67.06% (p<0.05). Kf (Y, %) had a positive curved relation to starch of flaked corn abomasally infused (X, g/d), Y=36.1605X0.0760 (n=16, r=0.9308). |
| Keywords:
Starch; Infusion; Cattle; Digestion; Fiber; Nitrogen Retention |
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