ارزیابی ارزش تغذیه‌ای ترکیبات قابل رسوب خیساب ذرت توسط تانن‌های استخراج شده از ضایعات ‏کشمش به‌عنوان یک منبع پروتئینی در تغذیه نشخوارکنندگان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه علوم دامی، دانشکده کشاورزی و منابع طبیعی، دانشگاه لرستان، خرم‌آباد، ایران

2 استاد، گروه علوم دامی، دانشکده کشاورزی و منابع طبیعی، دانشگاه لرستان، خرم‌آباد، ایران

3 استادیار، گروه علوم دامی، دانشکده کشاورزی و منابع طبیعی، دانشگاه لرستان، خرم‌آباد، ایران

چکیده

این آزمایش به‌منظور بررسی ارزش تغذیه­ای و برآورد میزان پروتئین محافظت شده پروتانومیکس به‌عنوان یک منبع پروتئینی جدید و مقایسه آن با کنجاله سویا طراحی شده است. پروتانومیکس پودری قهوه­ای رنگ بوده و از جداسازی رسوب ناشی از واکنش تانن­ با خیساب ذرت حاصل می‌شود. مقدار پروتئین خام (CP) و انرژی قابل­ متابولیسم (ME) در این منبع پروتئینی تقریباً شبیه کنجاله سویا بوده و بیش از 80 درصد از پروتئین آن، به شکل نامحلول است. در این مطالعه، قابلیت تولید گاز آزمایشگاهی در پروتانومیکس به‌طور معنی‌داری از تیمار شاهد (کنجاله سویا) کمتر بود (001/0P˂)؛ اگر چه، جایگزینی کنجاله سویا با سطوح مختلف از پروتانومیکس در جیره­های آزمایشی، منجر به تفاوت­های معنی‌داری در فراسنجه­های تولید گاز نگردید (05/0 P˃). در مقایسه پروتانومیکس با کنجاله سویا (شاهد)، فراسنجه­های تجزیه‌پذیری حقیقی ماده خشک در شرایط آزمایشگاهی (IVTDDM)، انرژی قابل متابولیسم (ME) و pH تفاوت­های معنی‌داری نداشتند (05/0 P˃)، اما غلظت اسیدهای چرب کوتاه زنجیر (SCFA)، قابلیت هضم ظاهری ماده آلی (IVOMAD) و نیتروژن آمونیاکی (N-NH3) در کنجاله سویا به‌طور معنی‌داری بالاتر بود (01/0P˂) در حالی که ضریب تفکیک (PF)، تولید پروتئین میکروبی (MPS) و بازده تولید پروتئین میکروبی (EMPS) در پروتانومیکس مقادیر بالاتری را نشان داد (05/0 P˂). با این حال، در جایگزینی کنجاله سویا با سطوح مختلف از پروتانومیکس در جیره­های آزمایشی، تنها N-NH3 بطور معنی‌داری کاهش یافت (05/0P˂).

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of nutritive value of perceptible compounds of corn-steep liquor by ‎tannins extracted from raisin by-products as a protein source in ruminant nutrition

نویسندگان [English]

  • Abolfazl Koolivand 1
  • Arash Azarfar 2
  • Amir Fadayifar 3
  • Ayoub Azizi 3
1 Ph.D. Student, Department of Animal Science, Faculty of Agriculture and Natural Resources, Lorestan University, Khorramabad, ‎Iran
2 Professor, Department of Animal Science, Faculty of Agriculture and Natural Resources, Lorestan University, Khorramabad, Iran
3 Assistant Professor, Department of Animal Science, Faculty of Agriculture and Natural Resources, Lorestan University, Khorramabad, Iran
چکیده [English]

This experiment was designed to survey the nutritive value and estimate protected-protein level of Protanomix as a new protein source and compare it with soybean meal. Protanomix is a brown powder by separating the precipitate produced from the reaction of tannin with corn-steep liquor. Crude protein (CP) and metabolizable energy (ME) in this protein source is nearly similar to soybean meal, and more than 80% of its protein content is insoluble. In this study, potential of in vitro gas production in Protanomix was significantly (P˂0.001) lower than the control treatment (soybean meal); however, substitution of soybean meal at different levels of Protanomix in experimental diets did not lead to significant changes in gas production parameters (P˃0.05). Comparing Protanomix with soybean meal (control) showed that in vitro truly degraded dry matter (IVTDDM), estimated metabilizable energy (ME) and pH were similar (P˃0.05). However, short chain fatty acids (SCFA), apparently in vitro organic matter digestibility (IVOMAD) and ammonia nitrogen (N-NH3) were significantly higher in soybean meal (P˂0.01) than Protanomix, while partitioning factor (PF), microbial protein synthesis (MPS) and efficiency of microbial protein synthesis (EMPS) were greater in Protanomix than soybean meal (P˂0.05). Nonetheless, when soybean meal was substituted with different levels of Protanomix in the experimental diets, only concentration of ammonia nitrogen (N-NH3) was significantly decreased (P˂0.001).

کلیدواژه‌ها [English]

  • Bypass protein
  • Raisin by-products
  • Tannin
  • Corn-steep liquor
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