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

2

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
1.      Association of Official Analytical Chemists (AOAC). (2002). Official Methods of Analysis. Vol. 1. 17th ed. AOAC, Arlington, VA.
2.     Bender RW, Cook DE and Combs DK (2016). Comparison of in situ versus in vitro methods of fiber digestion at 120 and 288 hours to quantify the indigestible neutral detergent fiber fraction of corn silage samples. Journal of Dairy Science, 99(7): 5394-5400.‏
3.     Cotanch KW (2015) Using 240 hour uNDF in the field. In: Proceeding 77th Cornell Nutrition Conference Feed Manufacturers. 107-110.
4.     Cotanch KW, Grant RJ, Van Amburgh ME, Zontini A, Fustini M, Palmonari A and Formigoni A (2014) Applica­tion of uNDF in ration modeling and formulation. In: Proceeding 76th Cornell Nutrition Conference Feed Manufacturers. 114-131.
5.      Esmaeili M, Khorvash M, Ghorbani GR, Nasrollahi SM and Saebi M (2016). Variation of TMR particle size and physical characteristics in commercial Iranian Holstein dairies and effects on eating behaviour, chewing activity, and milk production. Livestock Science. 191: 22-28.
 
 
6.     Hatfield R and Fukushima R.S (2005). Can lignin be accurately measured? CropScience. 45: 832-839.
7.     Iranian Council of Animal Care. (1995). Guide to the Care and Use of Experimental Animals. Vol. 1. Isfahan University of Technology, Isfahan, Iran.
8.     Jones LR and J Siciliano-Jones (2015) Considering Forage NDFu30 as a Constraint in Dairy Rations.‏ In: In: Proceeding 77th Cornell Nutrition Conference Feed Manufacturers. 103-106.
9.     Krämer M, Weisbjerg MR, Lund P, Jensen CS and Pedersen MG (2012). Estimation of indigestible NDF in forages and concentrates from cell wall composition. Animal Feed Science Technology, 177(1-2): 40-51.‏
10.   Krizsan SJ and Huhtanen P (2013). Effect of diet composition and incubation time on feed indigestible neutral detergent fiber concentration in dairy cows. Journal of Dairy Science, 96(3): 1715-1726.
11.   Licitra G, Hernandez TM and Van Soest PJ (1996). Standardization of procedures for nitrogen fractionation of ruminant feeds. Animal Feed Science Technology, 57(4): 347-358.‏
12.   Lopes F, Cook DE and Combs DK (2015). Effects of varying dietary ratios of corn silage to alfalfa silage on digestion of neutral detergent fiber in lactating dairy cows. Journal of Dairy Science, 98(9): 6291-6303.‏
13.   Lopes F, Ruh K, and Combs DK (2015). Validation of an approach to predict total-tract fiber digestibility using a standardized in vitro technique for different diets fed to high-producing cows. Journal of Dairy Science, 98(4): 2596-2602.
14.   Nasrollahi SM and Khorvash M (2014). Carbohydrates in Dairy Cow Nutrition. 1st ed. Khotan publication, Iran.
15.   NRC (2001). Nutrient Requirements of Dairy Cattle. 7th rev. ed. Natl. Acad. Sci., Washington, DC.
16.   Oba M and Allen MS (1999) Evaluation of the importance of NDF digestibility: Effects on dry matter intake and milk yield of dairy cows. Journal of Dairy Science, 82(3): 589-596.
17.   Raffrenato E (2011) Physical, chemical and kinetic factors associated with fiber digestibility in ruminants and models describing these relationships. PhD Diss. Cornell University, Ithaca, NY.
18.   Ranjbari M, Ghorbani GR, Alikahni M, Khorvash M (2007) Chemical composition,crude protein fractionation and ruminal degradability of maize silage produced in Isfahan. International Journal of Dairy Science, 2(1): 66-72.
19.   SAS Institute (2002) User’s Guide: Statistics. Version 9.1. SAS Inst., Inc., Cary, NC.
20.   St-Pierre NR and Weiss WP (2015) Partitioning variation in nutrient composition data of common feeds and mixed diets on commercial dairy farms. Journal of Dairy Science, 98: 5004-5015.
21.   Van Soest PJ (1994) Nutritional Ecology of the Ruminant, second ed. Cornell University Press, Ithaca, NY.
22.   Van Soest PJ and Wine RH (1968) Determination of lignin and cellulose in acid-detergent fiber with permanganate. Journal Association Official Analytical Chemistry, 51: 780-785.‏
23.   Van Soest PJ, Robertson JB and Lewis BA (1991). Methods for dietary fiber, neutral detergent fiber, and non-starch polysaccharide in relation to animal nutrition. Journal of Dairy Science, 74(10): 3583-3597.
24.   Volden H (2011) NorFor – The Nordic Feed Evaluation System. Wageningen Academic Publishers, Wageningen, The Netherlands.