The experiment was conducted to determine the apparent metabolizable energy (AME) of biological corn stalk (BCS) and its appropriate substitution rate for corn meal in broiler diets. Twenty four 42-day-old healthy Arbor Acres (AA) broilers were assigned to 3 groups and 8 broilers in each group. Broilers in group 1 were fed a basal diet with 8% BCS; those in group 2 were fed the basal diet added with 30% BCS to replace the same percentage of energy and protein feedstuffs in the basal diet; those in group 3 were used to measure AME by the superalimentation. To get the appropriate substitution rate of BCS for corn meal in broiler diets, another metabolic experiment was adopted. One hundred and fifty 22-day-old healthy AA broilers were assigned to 5 groups with 5 replicates in each group and 30 broilers in each replicate. The broilers in the control group were fed the basal diet; those in groups 1, 2 and 3 were fed the basal diets added with 4%, 8% and 12% BCS for replacing the same percentage of corn meal in the basal diet, respectively; those in group 4 were fed the basal diet added with 8% BCS for replacing the same percentage of corn meal in the basal diet under the condition that the metablizable energy (estimated at 5.30 MJ/kg) was adjusted to the same level as the control group by soybean oil addition. The results showed as follows: 1) the AME of the basal diet was 12.63 MJ/kg, so AME of BCS was predicted to be 12.46 MJ/kg by difference method. AME of BCS was 5.30 and 4.38 MJ/kg by superalimentation and substitution method, respectively. 2) The metabolic rates of NDF and ADF in groups 1 and 2 were significantly higher than those in the control group (P<0.05), and the energy metabolic rate in group 3 was reduced (P<0.05). It is concluded that the superalimentation and substitution method underestimated AME of BCS, and the AME of BCS predicted by difference method can better reflect the true nutrient values; 4% to 8% BCS in broiler diets can replace the same percentage of corn meal for keeping the same nutrient metabolic rates.
CHANG Juan
,
YIN Qingqiang
,
JIANG Yibao
,
ZHENG Qiuhong
,
ZUO Ruiyu
,
LI Shuli
. Biological Corn Stalk: Effects on Apparent Metabolizable Energy and Its Appropriate Substitution Rate for Corn Meal in Broiler Diets[J]. Chinese Journal of Animal Nutrition, 2012
, 24(8)
: 1557
-1563
.
DOI: 10.3969/j.issn.1006-267x.2012.08.021
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