Chemical Composition and in vitro and in vivo Digestibility of Tea Waste in Sheep
محورهای موضوعی : Camelم. زاهدی فر 1 , ح. فضائلی 2 , ا.ر. صفایی 3 , س.م. علوی 4
1 - Department of Animal Nutrition, Animal Science Research Institute of Iran (ASRI), Agricultural Research Education and Extension Organization (AREEO), Karaj, Iran
2 - Department of Animal Nutrition, Animal Science Research Institute of Iran (ASRI), Agricultural Research Education and Extension Organization (AREEO), Karaj, Iran
3 - Department of Animal Nutrition, Animal Science Research Institute of Iran (ASRI), Agricultural Research Education and Extension Organization (AREEO), Karaj, Iran
4 - Emam Khomeini Higher Education Center, Agricultural Research Education and Extension Organization (AREEO), Karaj, Iran
کلید واژه: chemical composition, Sheep, tea waste, <, i>, in vivo<, /i>, digestibility, <, i>, in vitro<, /i>, digestibility,
چکیده مقاله :
Tea processing includes several stages and in three of them namely drying, fiber-mat and screening some of the product is wasted. In this study, 25 percent of the tea processing plants in Iran were selected. Three samples were taken from each plant and analyzed for chemical composition and in vitro and in vivo digestibility and voluntary feed intake. Results showed that crude protein (CP) content of different tea by-products including drying, fiber-mat and screening were 198, 193 and 194 g/kg dry matter (DM), respectively, without significant difference among them. Concentration of ash were 64.0, 62.0 and 56.0 g/kg DM for drying, fiber-mat and screening respectively which was significantly (P<0.05) the lowest in Screening. The content of K, Ca, P, Mg and Na were 16.2, 4.2, 2.5, 2.2 and 0.73 g/kg DM, respectively, without significant difference among the samples. The mean values for in vitro digestibility coefficient of DM, organic matter (OM), OM/DM and gross energy of the tea wastes were 0.48, 0.44, 0.42 and 0.42, respectively. Inclusion of tea waste in the diet significantly (P<0.05) reduced in vivo digestibility coefficient of CP and neutral detergent fiber (NDF). The digestible energy was 10.0 MJ/kg which were not significantly different among the three types of tea waste. Inclusion of 80 g/kg DM tea waste in the diet significantly (P<0.05) reduced voluntary feed intake. Tea waste can be included in the diet of ruminants but its level should be limited due to presence of anti-nutritional factors.
فراوری چای شامل چند مرحله است که در سه مرحله شامل، خشک کردن، فایبرمات و غربال ضایعاتی بر جای میماند. در این تحقیق بیست و پنج درصد از کل کارخانجات چای خشککنی انتخاب شدند. تعداد سه نمونه جداگانه از هر کارخانه تهیه شده و مورد تجزیه شیمیایی و تعیین قابلیت هضم برونتنی و درونتنی و مصرف اختیاری قرار گرفتند. نتایج نشان داد که پروتئین خام ضایعات چای در مراحل خشک کردن، فایبرمات و غربال به ترتیب 198، 193 و 194 گرم در کیلوگرم بود و اختلاف بین آنها معنیدار نبود. تراکم خاکستر خام در سه مرحله خشک کردن، فایبرمات و غربال به ترتیب 64.0، 62.0 و 56.0 گرم در کیلوگرم بود که خاکستر در نمونه غربال به طور معنیداری کمتر بود (0.05>P). مقادیر پتاسیم، کلسیم، فسفر، منیزیم و سدیم برای ضایعات چای در سه مرحله ذکر شده به ترتیب 16.2، 4.2، 2.5، 2.2 و 0.73 گرم در کیلوگرم بود که اختلاف بین آنها معنیدار نبود. میانگین ضریب قابلیت هضم برونتنی برای DM، OM، OM/DM و GE برای ضایعات چای سه مرحله خشک کردن، فایبرمات و غربال به ترتیب 0.48، 0.44، 0.42 و 0.42 بود. نتایج آزمایشات قابلیت هضم درونتنی نشاندهنده روند کاهشی در ضرایب قابلیت هضم DM، OM، OM/DM و GE با افزایش سطوح ضایعات چای در جیره بود و کاهش در ضرایب قابلیت هضم برای CP و NDF معنیدار (0.05>P) بود. میانگین انرژی قابل هضم ضایعات چای 0.10 مگاژول در کیلوگرم بود و از این جهت بین سه نمونه ضایعات چای اختلاف معنیداری وجود نداشت. سطح 0.80 گرم در کیلوگرم ضایعات چای در جیره مصرف اختیاری خوراک را به طور معنیداری (0.05>P) کاهش داد. ضایعات چای میتواند بخشی از جیره دامهای نشخوارکننده را شامل شود ولی سطح آن به واسطه وجود مواد بازدارنده باید محدود گردد.
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