Replacing corn by cassava bagasse in concentrate mix fed to growing cattle. 2. Apparent digestibility, digestible nutrients intake, live weight gain and feed:gain ratio

Ramos, P.R.; Prates, E.R.; Fontanelli, R.S.; Barcellos, J.O.J.; Langwinski, D.; Bonelli, I.B.

Revista Brasileira de Zootecnia 29(1): 300-305

2000


ISSN/ISBN: 1516-3598
Accession: 003546469

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Abstract
The effect of the substitution of corn by cassava bagasse in concentrate on apparent digestibility, digestible nutrient intakes, average daily gain (ADG) and feed:gain ratio (F:G) in growing cattle was studied. Sixteen crossbred bulls were allotted to a completely randomized block design in two periods. Four types of concentrate were used with an ad libitum allowance of oat/ryegrass hay (Avena strigosa, Lolium multiflorum) and an average concentrate supplementation of 0.83% LW. Substitution levels by cassava bagasse were T1 0.0, T2 33.0, T3 66.0 and T4 99.0%. There was no effect of substitution by cassava bagasse on apparent digestibility coefficients. The digestible ADF intake (DADF) linearly increased with substitution by cassava bagasse. There was no effect of treatment on intakes of digestible dry matter (DDM), digestible organic matter (DOM), digestible NDF (NDF), digestible energy (DE) and metabolizable energy (ME), which were, respectively, for T1, T2, T3 and T4, 53.51, 54.50, 53.63 and 53.69 g DDM/kg0.75/day, 51.77, 52.37, 51.27 and 51.23 g DOM/kg0.75/day, 30.13, 30.93, 30.46 and 30.88 g DNDF/kg0.75/day, 224.13, 228.51, 224.77 and 225.33 kcal DE/kg0.75/day, and 183.75, 287.56, 184.38 and 184.43 kcal ME/kg0.75/day. The results obtained for ADG were 1.10, 0.95, 1.12 and 0.75 kg/animal/day, and for F:G 4.61, 6.17, 4.58 and 7.98, respectively for T1, T2, T3 and T4. The values of ADG and F:G, for the substitution of 99% by cassava bagasse were lower than those obtained by the levels of 0 and 66%, however, they were similar to the 33% level.