Valor nutritivo de três leguminosas forrageiras tropicais

The protein, phosphorus, and calcium contents, and the in vitro dry matter digestibility IVDMD percent of Cratylia floribunda, Canavalia obtusifolia and Dioclea lasiophylla were determined. The plants were grown in pots, in a greenhouse. The experimental design was a completely randomized block, with three replications, in a 5 x 3 factorial, being five cutting dates (15, 21, 30, 45 and 60 days old plants) and three species of plants. The protein percent ranged from 17.5 to 30.4%; 9.6 to 16.5% and from 20.2 to 29.9% for D. lasiophylla, C. obtusifolia and C. floribunda, respectively. The phosphorus contents ranged from 0.22 to 0.33%; 0.09 to 0.25% and from 0.17 to 0.28%, whereas the calcium contents ranged from 1.32 to 2.10%; 1.30 to 2.50% and from 1.54 to 2.10%. The highest IVDMD was found in C. obtusifolia (67.3 to 78.1%), followed by C. floribunda (60.6 to 69.0%) and by D. lasiophylla (51.2 to 61.4%).Foram determinadas as percentagens de proteína, de cálcio e de fósforo e a digestibilidade in vitro da matéria seca (DIVMS) de Cratylia floribunda, Canavalia obtusifolia e Dioclea lasiophylla, cultivadas em vasos, em casa de vegetação. Usou-se o delineamento experimental de blocos ao acaso, com três repetições, em fatorial 5 x 3, sendo cinco épocas de corte (aos 15, 21, 30, 45 e 60 dias de idade das plantas) e três espécies de planta. As percentagens de proteína variaram de 17,5 a 30,4%; de 9,6 a 16,5% e de 20,2 a 29,9% em D. lasiophylla, C. obtusifolia e C. floribunda, respectivamente. Os teores de fósforo variaram de 0,22 a 0,33%; 0,09 a 0,25% e de 0,17 a 0,28%, enquanto as percentagens de cálcio foram de 1,32 a 2,10%; 1,30 a 2,50% e de 1,54 a 2,10%. A DIVMS foi geralmente mais alta em C. obtusifolia, variando de 67,3 a 78,1%, seguindo-se C. floribunda (60,6 a 69,0%) e D. lasiophylla (51,2 a 61,4%)