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Effects of Dietary Betaine and Protein Levels on Performance, Blood Composition, Abdominal Fat and Liver Amino Acid Concentration in Laying Hens  

Park J. H. (Department of Animal Resources and Biotechnology, Chonbuk National University)
Park S. Y. (Department of Animal Resources and Biotechnology, Chonbuk National University)
Ryu K. S. (Department of Animal Resources and Biotechnology, Chonbuk National University)
Publication Information
Korean Journal of Poultry Science / v.32, no.3, 2005 , pp. 157-163 More about this Journal
Abstract
An experiment was conducted to investigate the effects of dietary betaine and protein levels on performance, internal e99 Qualify, blood composition, abdominal fat and liver amino acid concentration in laying hens. A total of 432 ISA-Brown laying hens were randomly allotted to four treatments with six replications for twenty few weeks. Treatments were factorially designed with two levels of crude protein(14.5 and $16.5\%$) and two levels of betaine(0 and 600ppm). The egg production was increased by feeding $16.5\%$ protein-fed group compared to that of $14.5\%$ protein-fed groups(P<0.05), but was different from betaine supplementation. Increasing protein and betaine supplementation to diets improved egg weight, egg mass and fred conversion(P<0.05). Eggshell breaking strength, thickness and Haugh unit were not influenced by either dietary betaine or protein levels. Dietary betaine did not affect serum total protein, albumin and uric acid concentration, whereas uric acid concentration was increased in $16.5\%$ protein-fed groups(P<0.05). The deposition of abdominal fat was lower in 600ppm betaine groups compared to those fed on 0ppm betaine groups(P<0.05). Concentration of the most hepatic amino acids were affected by dietary protein levels and betaine supplementation. There were synergistic effect between dietary protein and betaine. These results suggested that dietary betaine can improve the egg weight, mass, feed conversion and decrease the abdominal fat, but increase the hepatic amino acid contents.
Keywords
laying hens; betaine; performance; abdominal fat; liver amino acid;
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