Variations in root and foliage yields and quality among green mite-resistant cassava clones
1998
Larbi, A. | Smith, J.W. | Yusuf, O.T. (International Livestock Research Institute (ILRI), Ibadan (Nigeria)) | Dixon, A.G.O.
The objective, to determine variations in root and foliage yields, crude protein (CP), and dry matter (DM) degradation characteristics of foliage among 25 cassava clones selected for green mite resistance at Ibadan, south-western Nigeria. Clones were sampled 12 months after planting during the 1994-95 and 1995-96 growing seasons to determine root and foliage yields. Foliage samples were analysed for CP and degradation characteristics of DM in rumen-fistulated N'dama (Bos indicus) steers using the nylon bag method. Root yield ranged from 1.26 t DM ha**-1 to 7.67 t DM ha**-1, and foliage yield from 0.18 t DM ha**-1 to 2.21 t DM ha**_1. Crude protein varied from 248 g kg**-1 DM to 303 g kg**-1 DM. Variations in the soluble and degradable fractions, potential degradability, effective degradability and rate of degradation among clones were significant. Root yield was poorly correlated with foliage yield, CP, and effective degradability of foliage quality. Using root and foliage yields and effective degradability of DM as indices for root and foliage production, some clones appeared to have higher potential than others. Both agronomic and nutritive value indices of the root and foliage should be considered as selection criteria in future cassava improvement programmes in developing countries.
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