Postfeeding changes of blood metabolite levels in beef steers fed steamed wood
1992
Tsuneishi, E. (Tohoku National Agricultural Experiment Station, Morioka (Japan)) | Takimoto, Y. | Watanabe, A. | Sato, H.
Eight Japanese shorthorn steers were fed a roughage ration and concentrate in a 70:30 ratio (DM). Four steers were fed on steamed wood and the others were fed on corn silage, as roughage. In the control groups, 3 Japanese Shorthorn steers, 24 months of age, were fed on corn silage and concentrate in a 55:45 ratio. Changes in plasma metabolites levels after feeding at rearing stage, and finished fattening stage, and in the control group were determined. Blood samples were taken 2 times during prefeeding and at 1, 2, 3, 4 and 5 hours after feeding. The increase in insulin (Ins) levels after feeding was not observed except for the control group. Due to high roughage feeding, use of highly fibrous roughage such as steamed wood seems to have no advantages on the stabilization of postfeeding changes in blood metabolite levels. The addition of phosphorus (P), calcium (Ca) and potassium (K) to the concentrate which was required for feeding of the steamed wood, did not affect the plasma mineral levels after feeding. The soybean meal supplement elevated the plasma urea nitrogen (UN) levels. Glucose (GLU), inorganic phosphorus (iP) and Ca levels were lower, and total protein (TP), chlorine (Cl), triacylglycerol (TaG) and insulin levels at the fattening stage were higher than at the rearing stage. The positive correlation among the levels of GLU and iP was recognized, but the changes in these levels after feeding were contrary to each other. The present results indicate that there is little difference in maintaining plasma metabolites levels, between the steamed wood and corn silage, if they have high palatability
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