[국내논문]Effects of Varying Levels of Flaked Corn Starch Abomasally Infused on Nitrogen Retention and the Efficiency of Energy Conversion in Fattening Steers원문보기
Li, F.C.
(College of Animal Science and Technology, Shandong Agricultural University)
,
Feng, Y.L.
(College of Animal Science and Technology, P. R. China Agricultural University)
,
Wang, Z.H.
(College of Animal Science and Technology, Shandong Agricultural University)
,
Lin, H.
(College of Animal Science and Technology, Shandong Agricultural University)
The experiment was carried out to evaluate the effect of varying levels of flaked com 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 per...
The experiment was carried out to evaluate the effect of varying levels of flaked com 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 $4{\times}4$ 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 com abomasally infused (X, g/d), $Y=36.1605X^{0.0760}$ (n=16, r=0.9308).
The experiment was carried out to evaluate the effect of varying levels of flaked com 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 $4{\times}4$ 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 com abomasally infused (X, g/d), $Y=36.1605X^{0.0760}$ (n=16, r=0.9308).
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제안 방법
The objectives of this experiment were to determine the digestion post-ruminally of starch in flaked com and the effects of varying levels of flaked com abomasally infused on the digestion of fiber, nitrogen retention and the efficiency of energy conversion in fattening steers.
Huntington (1997) reported the capacity to digest starch in the intestine ranges from 45 to 88% of starch entering the duodenum,. The objectives of this experiment were to determine the digestion post-ruminally of starch in flaked com and the effects of varying levels of flaked com abomasally infused on the digestion of fiber, nitrogen retention and the efficiency of energy conversion in fattening steers.
The energy content of all materials was determined by adiabatic oxygen bomb calorimetry. Methane (CH4), CO2 and O2 concentrations measured by automatic gas analysers were recorded by the computer that controlled the operation of the respiration chambers, and the computer was programmed to calculate heat production (HP) from those data. The starch contents of feed and faeces were determined with glucoamylse and HC1 hydrolysis procedures (Ning, 1992).
데이터처리
Duncan's multiple range test was employed in the analysis of the results as a 4x4 Latin square design using the Statistical Analysis System (SAS, 1985).
The net efficiency of use of ME for growth and fattening (Kf) was calculated as (NEhigh-NEiow) /(MEhigh-MEiow), where the subscript 'high' represents the NE and ME values measured with a flaked com infusion, and 'low' refers to the control diet. Duncan's multiple range test was employed in the analysis of the results as a 4x4 Latin square design using the Statistical Analysis System (SAS, 1985).
성능/효과
If the amount of starch into the small intestine is large, the digestion of starch in the small intestine of ruminants will decrease. This research showed that the capacity for digestion of starch in flaked com in the small intestine in fattening steers is limited to 600 g/d. When the amount of starch in flaked com was more than 600 g/d, the post-ruminal digestion of starch in flaked com decreased.
후속연구
Further work is required to evaluate the effect of flaked com abomasally infused on N and energy m以ab이ism when N intake and energy intake is the same in fattening steers.
Tlic results of this experiment were obtained with diets that provided different N intakes (table 2). Further work is required to evaluate the effect of flaked com abomasally infused on N and energy metabolism when N intake and energy intake is the same in fattening steers.
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