Composition and in vitro digestibility of residues from selected cowpea (Vigna unguiculata) varieties
1986
Roxas, D.B. | Karim, S.M.R. | Lapitan, R.M. | Pascual, F.S. | Castillo, L.S. | Carangal, V.R.
Crude protein content of cowpea residues were found to differ significantly among cultivars and harvesting time. The mean content of fiber components (NDF), cellulose, hemicellulose and ADL did not differ among cultivars. Both cultivar and harvesting time influenced in vitro digestibility significantly, with values ranging from 57 to 64%. As the cowpea plants matured, digestibility of their residues tended to decrease. The yield per hectare of total DM [dry matter] and digestible DM differed significantly among cultivars and time of harvest. Digestible DM yield increased progressively from H1 to H3, while H4 was significantly less than H3. The forage digestible DM yield was negatively less than H3. The forage digestible DM yield was negatively correlated with grain yield for H3 and H4. Therefore, selection for high yield of the high-value product of grain may be associated with reduced yields per hectare of digestible DM.
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