نازک شکرانی قشلاق - گروه علوم دامی، دانشکده کشاورزی، دانشگاه تبریز، تبریز، ایران
حمید پایا - گروه علوم دامی، دانشکده کشاورزی، دانشگاه تبریز، تبریز، ایران
اکبر تقی زاده - گروه علوم دامی، دانشکده کشاورزی، دانشگاه تبریز، تبریز، ایران
حمید محمدزاده - گروه علوم دامی، دانشکده کشاورزی، دانشگاه تبریز، تبریز، ایران

The aim of this study was to determine of nutritive value of green and black tea waste, and determination of metabolizable energy (ME) and net energy for lactation (NEL) using in vitro gas production method. The obtained data was completely randomized design was analyzed using SAS procedures. The values of crude protein, crude ash, ether extract, neutral detergent fiber and acid detergent fiber in green tea waste were ۱۳.۷, ۳.۷, ۲, ۴۴.۶ and ۳۱.۷ %DM, also for black tea waste were ۱۴.۸, ۴.۷, ۲.۴, ۳۹.۶ and ۲۷.۱ %DM, respectively. The value of total phenol and extractable tannin for green tea waste were ۲۰.۳ and ۱۸.۷ %DM, and for black tea waste were ۱۸.۷ and ۱۲.۷ %DM, respectively. After ۹۶ h of incubation, black tea waste and alfalfa had the highest and lowest gas production volume among the test feeds (p<۰.۰۵). The gas production potential amounts of the green and black tea waste and alfalfa hay were obtained ۲۸۴.۲, ۲۹۴ and ۲۶۱.۹ ml/g DM, respectively. Rate of gas production for green and black tea waste and alfalfa hay were ۰.۰۷۴, ۰.۰۷۴ and ۰.۰۷۲ (h-۱), respectively. Black tea waste had the greatest estimated metabolizable energy and net energy for lactation (۹.۴۵ and ۵.۷۷ MJ/Kg DM) among feedstuffs. These results indicated that black and green tea waste had a nutritive value higher than last bloom alfalfa and can be used as a part of ruminants ration.

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