Effect of level of feed input on true metabolizable energy values and their additivity
1991
Flores, M.P. | Castanon, J.I.R.
Four experiments were carried out to study the effect on the TMEn value of the amount intubed of corn (25, 50, and 75 9) field beans (Vicia faba, 25, 50, and 75 g) soybean meal (25 and 50 g), sugar (25, 50, 75, and 100 g), common vetch (Vicia sativa, 30 and 75 g), and chickling vetch (Lathyrus cicera, 30 and 75 g). The TMEn value of feedstuffs was not modified when the amount intubed was 50 g or more; however, data were inconsistent when intake was only 25 g. The TMEn value of field beans was the same among experiments (P > .05) when the amount intubed was 50 g or more, The addition of corn to field beans or soybean meal did not modify their TMEn value but did reduce the precision. The additivity of TMEn values of several mixtures of corn with field beans or soybean meal was also studied. In general, the predicted values of the mixtures were not different (P > .05) from the values determined by direct intubation. The TMEn value of feedstuffs estimated from a regression model on feed intake was not different (P > .05) from the TMEn value obtained when 50 g or more were intubed. It is suggested that amounts of 50 g or more are preferable to intube Cornish roosters in TMEn assays. According to the results of the present study, the TMEn (MJ/kg DM, 1 MJ = .239 Mcal) value of the feedstuffs was soybean meal 12.7, sugar 16.0, common vetch 12.8, chickling vetch 11.5, corn (6.9% crude protein) 14.8, corn (9.3 g CP/100 g DM) 16.0, and field beans (34.9 or 27.1% CP) 12.5.
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