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Utilization of Rations Containing Different Proportions of Roughage and Concentrate as Measured by TDN and De¹

Kansas State University, Manhattan

Abstract

DE and TDN determinations were made with lambs on non-pelleted, pelleted, and pelleted plus hay rations with roughage to concentrate ratios of 80:20, 70:30, 60:40, and 50:50, respectively. Correlation coefficients for percentage DE and TDN were highly significant with all rations. This justifies the suggestion of other research workers that DE replace TDN values, which require much more work to obtain. DE and TDN values were higher, but not significantly, for pelleted than non-pelleted or pelleted plus hay rations.

The results indicated 30% as the minimum and 50% as the maximum concentrate in lamb fattening rations for best utilization. This was influenced by method of preparation. This work showed that, for practical application, 1 lb. of TDN was equivalent to 2,000 Calories.

¹ Contribution No. 240, Department of Animal Husbandry, Kansas State University, Manhattan.

² Present address: Ohio State University.

³ Present address: Agricultural Missionary, Nagasaki, Japan.