POTENTIAL OF FARM-PRODUCED CROP RESIDUES AS PROTEIN
SOURCES FOR SMALL-MEDIUM YIELDING DAIRY COWS

POTENTIAL OF FARM-PRODUCED CROP RESIDUES AS PROTEIN
SOURCES FOR SMALL-MEDIUM YIELDING DAIRY COWS

NOBBERT T. NGONGONI

CLETOS MAPIYE

MARIZVUKURU MWALE

BARTHOLOMEW MUPETA

MICHAEL CHIMONYO

The nutritive value of fifteen crops and by-products were investigated in terms of the protein and energy
value for rumen microbial protein synthesis using in-situ and mobile bag techniques. The sunflower
feedstuffs and the cotton seed cake have low digested carbohydrates, which may limit optimum microbial
protein synthesis, while forage legumes and cereals have higher digested carbo-hydrates (P< 0.05). Thus,
one way of improving protein digestibility protein rich crops is to feed them with cereal crops. The cereal
grains (maize, sorghum and pearl millet) and the forage legumes (groundnut and cowpea tops) showed a
negative protein balance value, suggesting that nitrogen limited optimum microbial protein synthesis in
relation to the available carbohydrates (P< 0.05). The nitrogen (N) content of the ram press sunflower cake
(43 g/kg DM) was within the range of the N content found in the commercial dairy concentrates (32 - 57 g/kg
DM). However, the N in the sunflower was more degradable in the rumen (92%) than that in the commercial
dairy concentrate (P < 0.05). It can therefore, be concluded that the ram press sunflower cake is potential
source of N for small-medium yielding dairy cows

African Journal of Agricultural Research

2007