The Effects of Indigestible Neutral Detergent Fiber (iNDF) of Alfalfa Hay and Corn Silage on Ruminal Degradability of Ration Fiber in Sheep

محورهای موضوعی : Camel

س. یوسفیان ¹ (Department of Animal Science, Animal Science and Aquaculture faculty, Agricultural and Natural Resource University, Sari, Mazandaran, Iran.)
ا. تیموری یانسری ² (Department of Animal Science, Animal Science and Aquaculture faculty, Agricultural and Natural Resource University, Sari, Mazandaran, Iran.)
ی. چاشنی دل ³ (Department of Animal Science, Faculty of Agricultural Science, Sari Agricultural Science and Natural Resources University, Sari, Iran)

تاریخ دریافت : 1396/01/10 تاریخ پذیرش : 1396/05/24 تاریخ انتشار : 1397/12/10

کلید واژه: Sheep, alfalfa hay, corn silage, indigestible neutral detergent fiber, rumen degradabil-ity,

چکیده مقاله :

Two experiments were carried out to evaluate the effects of indigestible neutral detergent fiber (iNDF) of ration for estimation of rumen degradability of fiber in sheep. In experiment 1, to determine feed iNDF, four ruminal fistulated Zel ewes were used. Three grams of alfalfa hay, corn silage, barley grain, wheat bran, ration 1 (including alfalfa hay and concentrate), and ration 2 (including corn silage and concentrate) in four replications were put in nylon bags and incubated in the rumen for 288 h. In experiment 2, the ruminal degradation of dry matter (DM), NDF, iNDF and potential digestible NDF (pdNDF) of alfalfa hay, corn silage, in both ration 1 and 2, were determined with in situ method using four ruminal fistulated Zel ewes. Rumen disappearance of DM at 0 and 2 hour incubation time and NDF at 96 hour incubation time in ration 2 were higher. The soluble, slowly degraded fractions, and rate of degradation in rations 1 and 2 were 28.93 and 25.93%; 50.40 and 46.26%; 2.36 and 3.19 %/h for DM; 11.81 and 11.74%; 61.37 and 46.32%, and 1.74 and 2.33 %/h for NDF, respectively. The iNDF content in alfalfa hay, corn silage, barley grain, wheat bran, ration 1 and 2 were 30.74 ± 3.02, 16.84 ± 2.14, 4.77 ± 1.48, 11.75 ± 2.29, 21.32 ± 0.77, and 11.42 ± 0.91% of DM, respectively. The results showed that despite the similarities in NDF content in both rations, difference in the iNDF content could affect on degradability in rumen.

چکیده انگلیسی:

به ­منظور ارزیابی اثر NDF غیر قابل هضم (iNDF) جیره بر تجزیه ­پذیری الیاف در شکمبه دو آزمایش طراحی شد. در آزمایش 1، برای تعیین iNDF از چهار میش فیستولا گذاری شده در ناحیه شکمبه استفاده شد و سه گرم از علوفه خشک یونجه، ماده سیلویی ذرت، دانه جو، سبوس گندم، جیره 1 (حاوی علوفه یونجه و کنسانتره)، و جیره 2 (حاوی ماده سیلویی ذرت و کنسانتره) در 4 تکرار در کیسه­ های نایلونی قرار داده شد و به مدت 288 ساعت در محیط شکمبه انکوباسیون شد. نمونه ­های خوراک و جیره برای ماده خشک، ماده آلی، پروتئین خام، عصاره اتری، ADF، NDF، NDF بالقوه قابل هضم (pdNDF)، NFC و خاکستر آنالیز شدند. در آزمایش 2، تجزیه ­پذیری شکمبه ­ای ماده خشک، NDF، iNDF و pdNDF علوفه خشک یونجه، ماده سیلویی ذرت، جیره 1 و جیره 2 با استفاده از تکنیک in situ و با استفاده از چهار میش زل فیستولا گذاری ­شده در ناحیه شکمبه انجام شد. میزان ناپدید شدن شکمبه ­ای برای ماده خشک در ساعت­ های صفر و 2 و برای NDF در ساعت 96 انکوباسیون برای جیره 2 بیشتر بود. بخش محلول، با قابلیت تجزیه آهسته و نرخ تجزیه پذیری جیره 1 و 2 برای ماده خشک به ترتیب 28.93 و 25.93 درصد؛ 50.40 و 46.26 درصد؛ 2.36 و 3.19 درصد، و برای NDF به ترتیب 11.81 و 11.74 درصد؛ 61.37 و 46.32 درصد؛ 1.74 و 2.33 درصد بود. محتوای iNDF برای علوفه خشک یونجه، ماده سیلویی ذرت، دانه جو، سبوس گندم، جیره 1 و 2، به ترتیب 3.02 ± 30.74، 2.14 ± 16.84، 1.48 ± 4.77، 2.29 ± 11.75، 0.77 ± 21.32 و 0.91 ± 11.42 درصد ماده خشک بود. نتایج نشان داد که با وجود محتوای یکسان NDF در دو جیره، وجود تفاوت در محتوای iNDF می­تواند بر تجزیه­ پذیری در شکمبه مؤثر باشد.

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