| บทคัดย่อ |
The effects of cassava bioethanol by-product (CEP)
and crude palm oil (CPO) on feed intake, nutrient digestibility,
and growth performance of yearling heifers were investigated
in a 150-day feeding trial. Eighteen, crossbred heifers
(Brahman x Thai native) were randomly allotted according
to 2×3 factorial arrangement. Low or high levels of CEP (15
or 30 % of concentrate, LCEP, or HCEP) were basal treatments
and 0, 2, and 4 % CPO were daily top-dressed.
Concentrate was supplemented at 1.75 % of body weight
(BW) and rice straw offered ad libitum. CEP level had no
significance on feed intake. CPO increased roughage intake,
concentrate intake, and total feed intake when expressed as
%BW/d (P<0.01) and as metabolic BW (kg0.75/d, P<0.05).
Intakes of dry matter (DM), organic matter (OM), and crude
protein (CP) were similar (P>0.05). Intake of fat increased
with higher levels of CPO (P<0.001). The DM, OM, CP, and
EE digestibility of cattle-fed HCEP was lower than LCEP, but
adding 4 % CPO increased digestibility. Growth performance
was similar for all diets (P>0.05).We concluded that CEP can
be used up to 30 % in the diet, with or without additional fat
inclusion. |
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