Effect of Lysine and Methionine Supplementation in Practical Broiler Diets Based on Groundnut Meal
Effect of Lysine and Methionine Supplementation in Practical Broiler Diets Based on Groundnut Meal
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Date
2015-04-01
Authors
Moutwakel Babiker, Fareed
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Abstract
The feeding value of decorticated groundnut meal (GNM) as a
sole vegetable protein supplement in broiler diets was studied.
A basal diet containing 30% GNM was formulated, and was
then supplemented with 0.25% L. lysine or 0.15% methionine or the
two amino acids combined together in the same quantities. These four
experimental diets, together with a fifth standard broiler diet
containing 15% of each of GNM and sesame meal, were fed to dayold
broiler chicks in a 6-weeks feeding trial. The feeding trial was
arranged in a randomized block design with three replicates of five
dietary treatments. The broiler performance parameters on these diets
were assessed and compared for treatment differences.
The results indicated that the birds fed the standard broiler diet
attained the highest liveweight gain (P<0.05) and the best-feed
conversion efficiency. On the other hand the birds fed the basal diet,
with 30% GNM, attained a better liveweight gain than the birds fed
the basal diet supplemented with lysine, methionine or lysine plus
methionine (P<0.05). Feed consumption was markedly, though not
significantly, depressed by the supplementation of the amino acids to
the basal diet; and it was lowest on the methionine supplemented diet.
The lowest livewieght gain (P<0.05) and the highest feed conversion
ratio were attained on the lysine supplemented diet. These parameters
were improved by supplementation of the basal diet with methionine
or methionine plus lysine.
These effects are attributed to dietary amino acid imbalance
created by excessive intake of lysine and methionine from the
respective supplemented diets, which negatively affected feed and
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nutrients intake and the efficiency of amino acids utilization for tissue
synthesis. It can generally be implied that the high incorporation level
of GNM in the basal diet provided a suitable pattern of amino acids in
relation to the NRC recommendations; and this has been distorted by
the addition of either lysine or methionine or the two combined
together which resulted in depressed broiler performance
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Keywords
EFFECT OF LYSINE AND METHIONINE SUPPLEMENTATION IN PRACTICAL BROILER DIETS BASED ON GROUNDNUT MEAL