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KMID : 1024620080280050610
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Food Science of Animal Resources
2008 Volume.28 No. 5 p.610 ~ p.615
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Effects of Feeding Rhus verniciflua Extract on Egg Quality and Performance of Laying Hens
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Kang Hwan-Ku
Kang Geun-Ho
Na Jae-Cheon
Yu Dong-Jo
Kim Dong-Wook
Lee Sang-Jin
Kim Sang-Ho
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Abstract
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This experiment was conducted to investigate the effects of drinking of Rhus tree-extract on laying performance and egg quality in hens. Four hundred eighty, 55-wk-old ISA brown, laying hens were divided into six groups, control, Rhus tree-extract 500 ppm, 1,000 ppm, 2,000 ppm, 3,000 ppm and 5,000 ppm. The hens were fed a supplemented drink containing Rhus tree-extract for 12 weeks. Egg production and egg mass increased by drinking Rhus tree-extract (p<0.05) and the feed conversion ratio also improved in Rhus tree-extract groups. Cecal numbers of Lactobacillus spp., E. coli and Salmonella were not different in treatments. Availability of protein and ash improved in the Rhus extract groups. The eggshell breaking strength and egg shell thickness were significantly increased in Rhus tree-extract 3,000 ppm and Rhus tree-extract 2,000 ppm groups compared to the other groups. Also, egg yolk color and Haugh unit were significantly improved by the dietary Rhus tree-extract (p<0.05).
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KEYWORD
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Rhus tree-extract, hens, egg quality, Haugh unit
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