Influences of Long-Term Feeding of Japanese Green Tea Powder on Laying Performance and Egg Quality in Hens

Influence of catechin (flavan-3-ol) addition to breeder quail (Coturnix coturnix japonica) diets on productivity, reproductive performance, egg quality and yolk oxidative stability

“…Biswas et al (2000) reported that green tea powder supplementation (0.6%) to laying hen diet significantly reduced total lipid concentration of egg yolk. The absorption of fat and carbohydrate was found to be reduced by tea powder or extracts by Koo and Cho (2004).…”

“…Current studies informed that green tea catechins, the main components of green tea leaf, have many physiological and biochemical functions, including antioxidant (radical and oxidant scavenging, metal chelating, and inhibition of pro-oxidant enzymes), antimicrobial, anticarcinogenic, hypoallergic and blood glucose reduction in studies on different animal species (Frei & Higdon 2003;Koo & Cho 2004;Zhong et al 2009;Ariana et al 2011;Kara & Guclu 2012). The studies carried out on hens and quail emphasized especially the antioxidation effect on the blood and the animal products (meat and egg) and also on performance (Tang et al 2000;Biswas et al 2000;Abdo et al 2010;Sahin et al 2010;Ariana et al 2011). The change in performance parameters such as live weight, feed intake, egg production, and feed efficiency was not observed in some studies which used green tea leaves or extracts (Biswas et al 2000;Biswas & Wakita 2001;Ariana et al 2011) as corresponding with results of the present study, and despite that in some studies these parameters had a negative effect (Uuganbayar et al 2006;Kojima & Yosida 2008;Sarker et al 2010).…”

“…The studies carried out on hens and quail emphasized especially the antioxidation effect on the blood and the animal products (meat and egg) and also on performance (Tang et al 2000;Biswas et al 2000;Abdo et al 2010;Sahin et al 2010;Ariana et al 2011). The change in performance parameters such as live weight, feed intake, egg production, and feed efficiency was not observed in some studies which used green tea leaves or extracts (Biswas et al 2000;Biswas & Wakita 2001;Ariana et al 2011) as corresponding with results of the present study, and despite that in some studies these parameters had a negative effect (Uuganbayar et al 2006;Kojima & Yosida 2008;Sarker et al 2010). The egg weight decreased 4.56% and 5.70% by 0.2% and 0.4% catechins supplementation respectively, but Ariana et al (2011) state that egg weight did not change in the 1.5% green tea powder and 0.5% green tea extract.…”

“…Epigallocatechin-3-gallate is the main catechin found in green tea; it accounts for about 50-60% of total catechins and is a considerably active compound in biological terms (Koo & Cho 2004;Uuganbayar et al 2006;Zhong et al 2009;Ariana et al 2011). The herb or its extract, which has abundant ingredient catechins, was determined to have antioxidant, antimicrobial, antifungal, anti-carcinogenic, hypoallergic, and hypoglycemic effects by previous studies (Biswas et al 2000;Kocyigit et al 2000;Koo & Cho 2004;Ariana et al 2011;Kara & Guclu 2012). In some studies, it was established that supplementation of green tea powder or extract to poultry diets decreased thiobarbituric acid reactive substances (TBARS) levels of the meat, egg, and sperm and cholesterol of the egg, increased hatchability of fertile eggs and quality of sperm (Biswas et al 2000;Uuganbayar et al 2005;Abdo et al 2010;Sarker et al 2010).…”

Effects of grape pomace supplementation to laying hen diet on performance, egg quality, egg lipid peroxidation and some biochemical parameters

“…Antioxidant supplements improve animal origin food quality regarding colour, oxidative stability, tenderness and storage properties. Therefore, antioxidants of a kind of natural polyphenols (catechins, resveratrol), carotenoids and tocopherols have been used (Biswas et al 2000;Uuganbayar et al 2005;Sahin et al 2008Sahin et al , 2010Jung et al 2011).…”