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J Anim Physiol Anim Nutr (Berl). 2019 Oct 8. doi: 10.1111/jpn.13219. [Epub ahead of print]

Nutritional applications and beneficial health applications of green tea and l-theanine in some animal species: A review.

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Poultry Department, Faculty of Agriculture, Zagazig University, Zagazig, Egypt.
Department of Animal Nutrition, Cholistan University of Veterinary and Animal Sciences Bahawalpur, Pakistan.
Faculty of Pharmacy and Alternative Medicine, Islamia University of Bahawalpur, Bahawalpur, Pakistan.
Department of Clinical Pharmacy, School of Basic Medicine, and Clinical Pharmacy, China Pharmaceutical University, Nanjing, Jiangsu Province, China.
College of Animal Science and Technology, NW A&F University, Yangling, Shaanxi, China.
Department of Animal Sciences, University College of Agriculture, University of Sargodha, Pakistan.
Department of Veterinary Microbiology and Immunology, College of Veterinary Sciences, UP Pandit Deen Dayal Upadhayay Pashu Chikitsa Vigyan Vishwavidyalay Evum Go-Anusandhan Sansthan (DUVASU), Mathura, Uttar Pradesh, India.
Department of Genetics, Barkatullah University, Bhopal, India.
ICAR-Central Institute for Research on Buffaloes, Hisar, Haryana, India.
Central University Laboratory, Tamil Nadu Veterinary and Animal Sciences University, Chennai, Tamil Nadu, India.
Sher-E-Kashmir University of Agricultural Sciences and Technology of Kashmir, Shalimar, Srinagar, Jammu and Kashmir, India.
Teaching Veterinary Clinical Complex, College of Veterinary and Animal Sciences, Govind Ballabh Pant University of Agriculture and Technology, Pantnagar (Udham Singh Nagar), Uttarakhand, India.
Division of Surgery, ICAR-Indian Veterinary Research Institute, Uttar Pradesh, Izatnagar, Bareilly, India.
School of Engineering and Science, Tecnologico de Monterrey, Campus Monterrey, Monterrey, NL, Mexico.
Division of Pathology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh, India.


Green tea (Camellia sinensis) is a popular herbal plant with abundant health benefits, and thus, it has been used as a potent antioxidant for a long time. Based on the available literature, the diversity and the availability of multifunctional compounds in green tea offer its noteworthy potential against many diseases such as liver and heart diseases, inflammatory conditions and different metabolic syndromes. Owing to its bioactive constituents including caffeine, amino acids, l-theanine, polyphenols/flavonoids and carbohydrates among other potent molecules, green tea has many pharmacological and physiological effects. The effects of green tea include anti-oxidative, anti-inflammatory, anti-arthritic, anti-stress, hypolipidaemic, hypocholesterolaemic, skin/collagen protective, hepatoprotective, anti-diabetic, anti-microbial, anti-infective, anti-parasitic, anti-cancerous, inhibition of tumorigenesis and angiogenesis, anti-mutagenic, and memory and bone health-improving activities. Apart from its utilization in humans, green tea has also played a significant role in livestock production such as in dairy, piggery, goatry and poultry industries. Supplementation of animal feeds with green tea and its products is in line with the modern concepts of organic livestock production. Hence, incorporating green tea or green tea by-products into the diet of poultry and other livestock can enhance the value of the products obtained from these animals. Herein, an effort is made to extend the knowledge on the importance and useful applications of green tea and its important constituents in animal production including poultry. This review will be a guideline for researchers and entrepreneurs who want to explore the utilization of feeds supplemented with green tea and green tea by-products for the enhancement of livestock production.


Green tea; animals; growth performance; health; l-theanine; poultry


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