The effect of oscillating metabolizable protein provision on nitrogen utilization in sheep fed at maintenance level of requirement

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  • 維持レベル飼養下における代謝タンパク質の変動供給が成メンヨウの窒素出納に及ぼす影響

Abstract

The effect of oscillating the metabolizable protein (MP) provision on the nitrogen (N) utilization in adult sheep was studied. Four crossbred Suffolk adult rams were fed the diets with following feeding regimens by a change-over experimental design ; static feeding a diet at maintenance level of requirement (control treatment), and oscillating feeding with two diets which can provide low (60%) and high (140%) quantities of MP at maintenance level of requirement on a 48 h basis (oscillating treatment). These diets were formulated to give comparative provision levels of both metabolizable energy (ME) and MP at 4 days of unit by using the in situ rumen degradation parameters of organic matter and N, and chemical composition of feed ingredients. The animals were fed control and oscillating diets for a period of 23 days, respectively, and metabolism trial, rumination behavior recordings and blood sample collections were carried out for the last 9 days of the period. Animals consumed their diets thoroughly. The estimated intakes of ME and MP did not differ significantly between the treatments (P>0.05). The apparent digestibility were not affected by feeding treatments (P>0.05). Urinary N excretion was significantly lower for oscillating treatment than for control treatment (P<0.01). Although the figures of N retention did not differ significantly between the treatments (P>0.05), it seemed to be numerically higher for oscillating treatment as compared for control treatment. The concentrations of plasma urea N and glucose were significantly higher for oscillating treatment than those for control treatment (P<0.001). There was no difference in microbial N supply between the treatments (P>0.05), while the efficiency of microbial synthesis was higher for oscillating treatment compared with control treatment (P=0.001). The results obtained in this study suggest that oscillating MP provision by feeding two rations with high forage ratio could increase the utilization of N by reducing their urinary N excretion or increasing urea recycling in adult ram at their maintenance level of feeding.

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