Vet Med - Czech, 2015, 60(11):629-634 | DOI: 10.17221/8531-VETMED
Effects of dietary gamma-aminobutyric acid on egg production, egg quality, and blood profiles in layer hensOriginal Paper
- Department of Animal Resource and Science, Dankook University, Cheonan, Republic of Korea
Hy-line brown commercial layers (32 weeks old) were used to investigate the effects of GABA (gamma-aminobutyric acid) derived from E. coli strains on productivity, egg quality, and blood profile. In total, 288 birds (1946 ± 0.5 g) were fed four different levels of GABA (0, 25, 50, and 100 ppm), in a basal diet based on corn-soybean meal, for five weeks. Egg production, egg weight, and egg mass during weeks 32 to 36 showed significant improvement, as dietary GABA was increased from 0 to 100 ppm (linear, P < 0.05). Additionally, GABA supplementation was associated with increased eggshell breaking strength and albumen height (quadratic and linear, P < 0.05). Blood variables, such as white blood cells, red blood cells, lymphocyte, cortisol, epinephrine, and norepinephrine concentrations, were not influenced by addition of GABA to the diet; however, the haptoglobin concentration decreased significantly (linearly) and the IgG concentration increased (quadratically) in the GABA-fed groups (P < 0.05). These results suggest that diets containing GABA may beneficially affect productivity, egg quality, serum haptoglobin, and IgG concentrations in layers.
Keywords: gamma-aminobutyric acid; egg production; egg quality; blood profile; layer
Published: November 30, 2015 Show citation
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