kasetsart journal natural science

µ
reproductive traits or nutrient
intake measured.
= the overall mean
Si = effect of ith farm scale (i = 1, 2)
Pj = effect of jth Parity class
(j = 1, 2)
SP (ij) = interaction between farm scales
and parity classes
e (ijk) = error term
The Model used to analyze effects of
farm scale, parity class and period on milk
composition was:
Yijk = µ + Si + Pj + Tk + e (ijk)
Where, Yijk = the means for milk composition
µ = the overall mean
Si = effect of ith farm scale (i = 1, 2)
Pj = effect of jth Parity class (j = 1, 2)
Tk = effect of kth period (k = 1, 2, 3)
e (ijk) = error term (assumed
Kasetsart J. (Nat. Sci.) 40(1) 61
independently and normally
distributed)
RESULTS AND DISCUSSION
Chemical composition of feed resources
Mean chemical compositions (% DM) of
the available feed resources utilized on different
farms are presented in Table 1. Some of the small
scale farmers used cereal crop residues after
soaking them with home-made brewers’ grain byproducts.
It was observed that soaking tef and
wheat straws with brewer’s grain by product
substantially increased the CP, ME, Ca
compositions and IVDMOD of the feeds.
Feeds and nutrient intake
Significant differences were observed
between the large and small scale farms in daily
Table 1 Mean chemical compositions of feed resources available for graded Holstein Friesian cows in
central Rift Valley, Ethiopia.
Feed types (% DM)
DM CP ME(MJ) NDF EE ASH IVOMD Ca P Na
Native grass hay 92 4.4 5.7 76.9 1.2 8.0 35.9 0.3 0.15 0.54
Native grass forage 13 9.1 7.2 75.9 1.4 9.3 45.0 0.43 0.3 0.01
Alfalfa forage 35 17.4 8.6 50.9 1.8 11.8 53.9 1.0 0.3 0.22
Elephant grass 15 13 8.1 50.9 1.9 17.1 50.3 0.2 0.3 0.1
Maize forage 35 10.4 10.0 62.3 1.3 9.2 62.4 0.24 0.33 0.2
Maize stover 91 5.6 8.85 81.2 0.7 8.2 55.3 0.35 0.10 1.7
Wheat straw* 62 13.1 10.4 59.0 8.4 6.5 65.1 0.4 0.4 0.22
Wheat straw 92 2.7 5.81 81.6 0.9 8.2 36.3 0.09 0.05 0.001
Tef straw* 73 12.7 9.7 59.9 5.1 6.1 60.9 0.33 0.4 0.03
Tef straw 92 4.3 6.2 83.1 1.1 6.6 38.6 0.2 0.09 0.08
Haricot bean straw 91 5.2 6.8 71.0 0.7 8.1 42.5 0.18 0.05 0.26
Molasses 74 3.5 15.9 - 5.9 5.9 98.7 1.8 0.10 0.26
Brewers grain residue 13 21.4 11.0 57.4 3.5 4.0 69.0 0.61 0.59 0.004
Noug seed cake 91 29.7 9.3 36.4 6.2 10.9 58.1 0.69 0.99 0.03
Linseed cake 90 29.1 10.6 24.3 9.1 8.1 66.3 0.51 0.92 0.22
Cotton seed cake 90 22.3 7.6 48.7 6.6 5.6 47.5 0.19 0.74 0.08
Wheat bran 88 17.1 11.6 38.4 4.6 4.4 72.4 0.11 1.0 0.05
Mixed concentrate 89 21.3 10.6 37.4 4.7 7.1 66.3 0.34 1.2 0.25
* Soaked in home-made brewers grain residues (Atala)