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http://dx.doi.org/10.5536/KJPS.2022.49.4.239

Effect of γ-Aminobutyric Acid and Probiotics on the Performance, Egg Quality and Blood Parameter of Laying Hens Parent Stock in Summer  

Ji Heon, Kim (Department of Animal Science, Sangji University)
Yoo Don, Ko (Department of Animal Science, Sangji University)
Ha Guyn, Sung (Department of Animal Science, Sangji University)
Publication Information
Korean Journal of Poultry Science / v.49, no.4, 2022 , pp. 239-246 More about this Journal
Abstract
This study was conducted to investigate the effects of dietary γ-aminobutyric acid (GABA) and a probiotic mixture on egg production and quality, blood parameters, and stress levels (corticosterone) in Hy-Line parent stock during summer in Korea. A total of 105 Hy-Line parent stock aged 24 weeks were randomly divided into three groups, each containing thirty-five birds: control, γ-aminobutyric acid (GABA), and probiotics (1 × 108/g Bacillus licheniformis, 1 × 107/g Lactobacillus plantarum, and 1 × 107/g Corynebacterium butyricum). The hens were fed a diet containing 50 ppm GABA or 0.1% probiotics for 6 weeks. Compared with the control group, the hen-day egg production, egg mass, and feed conversion ratio over the total period were significantly higher in the probiotic group (P<0.05). In contrast no significant differences were detected among groups with respect to egg weight, albumen height, Haugh units, yolk color, shell thickness or shell strength. Similarly, no significant difference were observed among groups with regards to biochemical profile (total cholesterol, triglyceride, glucose, total protein, aspartate aminotransferase, alanine aminotransferase, albumin, and inorganic phosphorus). However, compared with the control group, we did detect significant reductions in corticosterone levels in the GABA and probiotics groups (P<0.05). On the basis of our findings in this study, it would appear that dietary GABA and probiotics can alleviate heat stress in Hy-Line parent stock, with probiotics in particular being found to promote significant improvements in the hen-day egg production, egg mass, and feed conversion of laying hens during the summer season in Korea.
Keywords
Hy-Line parent stock; summer; ${\gamma}-aminobutyric$; probiotics; stress;
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