Abstract
<p><strong>Background</strong>. A possible effect of live weight on digestion capacity and starch and nitrogen utilization in cattle has been suggested, however, to our knowledge, this effect has not been evaluated by direct testing. This becomes especially relevant when finishing diets are used, which are characterized by their high percentages of starch and nitrogen <strong>Objective: </strong>To study the possible effect of live weight (BW) on digestion and utilization of two treatments corn, dry rolled (DR) and steam-flaked (SF). <strong>Results</strong>. Microbial N and microbial efficiency were not affected by the live weight by corn processing interaction. PV decreased linearly (P&lt;0.01) rumen starch digestion in response to dry-rolled corn, whereas with steamed corn, PV had an opposite effect by linearly (P&lt;0.01) increasing rumen starch digestion. <strong>Implications.</strong> Attention should not be paid to the live weight of the animals when choosing the type of grain processing. <strong>Conclusions. </strong>It is concluded that live weight does not have a significant effect on the digestion of corn starch, but there is a quadratic effect on the nitrogen efficiency; however, the direction of this effect (increase or decrease in digestion as PV increases) depends on the type of grain processing.</p>
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