نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکاه صنعتی اصفهان

2 هیئت علمی دانشگاه صنعتی اصفهان

3 IUT

4 اصفهان- دانشگاه صنعتی اصفهان- دانشکده کشاورزی- گروه علوم دامی

5 مشاور

چکیده

این مطالعه به منظور بررسی الیاف نامحلول در شوینده خنثی غیر قابل هضم (iNDF) و سایر مولفه‌های نوین هضم الیاف در نمونه هایی یونجه خشک، ذرت سیلوشده، کاه گندم، تفاله چغندرقند و سبوس گندم موجود در یک دامداری گاو شیری انجام شد. با استفاده از روش کیسه‌گذاری در دو رأس گاو هلشتاین غیر شیرده مجهز به فیستولای شکمبه‌ای، الیاف نامحلول در شونده خنثی هضم نشده پس از 288 ساعت (uNDF) به عنوان شاخصی از iNDF اندازگیری شد. سپس با استفاده از این روش کینتیک هضم پذیری در زمان‌های مختلف، مقادیر نرخ هضم و مقدار الیاف نامحلول در شوینده خنثی هضم شده (NDFD) تعیین و بر اساس آنها مقدار قابلیت هضم NDF در کل لوله گوارش (TTNDFD) پیش‌بینی شد. یونجه خشک دارای سطح لیگنین و نرخ هضم NDF بیشتر از کاه و ذرت سیلوشده بود. یونجه و کاه در مقایسه با ذرت سیلوشده دارای uNDF بیشتر و NDFD و TTNDFD کمتر بودند. تفاله چغندرقند و سبوس گندم با وجود شباهت در میزان NDF، مقدار لیگنین و uNDF کمتر و نرخ هضم NDF، NDFD و TTNDFD بیشتری در مقایسه با علوفه‌ها داشتند. در کل مواد خوراکی بررسی شده در این آزمایش دارای تنوع گسترده‌ای از نظر uNDF، NDFD وTTNDFD بودند که بایستی در زمان استفاده مورد توجه قرار گیرد.

کلیدواژه‌ها

عنوان مقاله [English]

Determination of indigestible neutral detergent fiber and other newly identified parameters of fiber digestibility in fibrous feedstuffs of a dairy farm

نویسندگان [English]

  • Ali Kahyani 1
  • G. R. Ghorbani 2
  • M. Alikhani 3
  • E. Ghasemi 3
  • A. Sadeghi-Sefidmazgi 4
  • Sayyed Mahmoud Nasrollahi 5

1 IUT

3 IUT

4 IUT

5 Supervisour

چکیده [English]

The study was conducted to evaluate indigestible neutral detergent fiber (iNDF) and other related parameters of fiber digestibility of alfalfa hay, corn silage, wheat straw, beet pulp, and wheat bran of a dairy farm. Using two cannulated non-lactating Holstein cows and in situ method, undigested neutral detergent fiber (uNDF) after 288 h was measured as indicator of iNDF. Then with evaluating the kinetic of fiber digestibility in several time points, the rate and extent of NDF digestibility (NDFD) were measured according to newly-developed equations. The measured NDFD was used for estimation of total tract NDF digestibility (TTNDFD). Alfalfa hay had a greater amount of lignin as well as greater rate of NDF digestion than corn silage and wheat straw. Alfalfa hay and wheat straw, compared with corn silage, had a greater amount of uNDF and lower NDFD and TTNDFD. In spite of having relatively similar amount of NDF, the beet pulp and wheat bran had lower amounts of lignin and uNDF, while greater rate and extent of NDF digestibility as well as TTNDFD than forages. Overall, the considered fibrous feedstuffs showed a considerable variation in uNDF, NDFD, and TTNDFD that must be considered at the time of use.

کلیدواژه‌ها [English]

  • undigested neutral detergent fiber
  • forages
  • kinetic of fiber digestibility
  • Dairy Cows
  • byproducts
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