Nutritive value of forages and diets in some small-scale dairy farms in Kiambu County, Kenya in the short rains season

Abstract

Sixteen selected small-scale dairy farms were investigated in Kiambu County (Kenya) during the short rains season
to develop a snapshot of the types of rations fed, milk yields obtained and sources of fodder. On average farmers had
1 ha of land and 2.2 lactating cows yielding 8.93 kg milk/cow/d with feed intake of 10.5 kg DM/d. Only 35% of feed
consumed was produced on farm. Boma Rhodes grass hay and green Napier grass were the main forage components
(37.9 and 28.3% of total DM). Protein forages used were the herbaceous legumes lucerne and desmodium (19.9 and
15.9% CP, respectively) and leguminous shrubs (Leucaena, Calliandra and Sesbania with 21.1% CP and 43.4%
aNDFom, on average). Grasses had higher aNDFom digestibility (47.1%) than legumes (39.7%). Napier grass, Boma
Rhodes grass, lucerne and desmodium had fiber digestibility of 51.9, 48.6, 46.8 and 32.6%, respectively. The energy
and protein balances (actual vs. requirements) of the cows were on average -19.3 and -16.4%, respectively, indicating
that cows utilized body tissues to produce the levels of milk obtained. Mutiple correspondence analysis showed that a
milk yield higher than 9.1 kg/d was associated with a level of Boma Rhodes grass <5 kg DM/d, concentration of nonfibrous carbohydrates in the diet >22.0% (DM basis), concentrate level >2.63 kg/cow/d and CP% in the ration >9.1%. To improve milk yields during this season farmers should harvest grass forage at a younger age, include leguminous forage in the diets and increase the level of concentrates fed. These strategies should be demonstrated on farms to show possible benefits.