نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانش‌آموخته کارشناسی ارشد، گروه علوم دام و طیور، پردیس ابوریحان، دانشگاه تهران، پاکدشت، ایران.
2 استاد، گروه علوم دام و طیور، پردیس ابوریحان، دانشگاه تهران، پاکدشت، ایران.
3 دانشیار، گروه علوم دام و طیور، پردیس ابوریحان، دانشگاه تهران، پاکدشت، ایران.
چکیده
مطالعه حاضر با هدف بررسی اثر فرآوری کاه گندم و باگاس نیشکر با اوره بر ترکیب شیمیایی، زمان تأخیر و فراسنجه های تجزیه‌پذیری ماده خشک و الیاف نامحلول در شوینده خنثی (NDF) به روش کیسه های نایلونی انجام شد. ترکیب شیمیایی و فراسنجه های تجزیه‌پذیری نمونه های فرآوری‌نشده و عمل‌آوری‌شده با پنج درصد اوره با استفاده از سه راس گاو شیرده (با میانگین وزنی 15±615 کیلوگرم و سه شکم زایش) مجهز به فیستولای شکمبه ای تعیین شد. عمل‌آوری با اوره موجب کاهش زمان تأخیر تجزیه ماده خشک و NDF کاه گندم شد (0/05>P)، اما تأثیری بر زمان تأخیر تجزیه ماده خشک و NDF باگاس نیشکر نداشت. عمل‌آوری کاه گندم با اوره موجب افزایش نرخ تجزیه‌پذیری ماده خشک و NDF شد (0/05>P). اما اثری بر نرخ تجزیه‌پذیری هماده خشک و NDF باگاس نیشکر نداشت. بخش تجزیه‌پذیر بالقوه ماده خشک و NDF هر دو ماده آزمایشی کاه گندم و باگاس نیشکر بعد از عمل‌آوری با اوره افزایش یافت (0/05>P). تجزیه‌پذیری مؤثر هماده خشک و NDF مواد خشبی مورد آزمایش پس از عمل‌آوری با اوره در کاه گندم به‌ترتیب از 35/69 و 21/69 درصد به 44/04 و 29/12 و در باگاس نیشکر به‌ترتیب از 18/88 و 15/65 درصد به 92/23 و 19/52 درصد افزایش یافت (0/05>P). براساس نتایج این آزمایش عمل‌آوری مواد خوراکی خشبی بهویژه کاه گندم با اوره باعث بهبود تجزیه‌پذیری ماده خشک و NDF میشود.
کلیدواژه‌ها
عنوان مقاله [English]
The study of chemical composition and ruminal degradability parameters of urea treatment of wheat straw and sugarcane bagasse
نویسندگان [English]
- mansour Dehghani 1
- Ahmad Afzalzadeh 2
- Mohammad Ali Norouzian 3
1 animal Science, College of Abouraihan
2 animal Science/ Abouraihan college
3
چکیده [English]
The present study was conducted to evaluate the effect of urea treatment of wheat straw and sugarcane bagasse on chemical composition, lag time and ruminal degradability parameters of dry matter (DM) and neutral detergent fiber (NDF) by nylon bag technique. The chemical composition and degradability parameters of unprocessed samples and processed samples with five percent urea were determined using three mature rumen-fistulated Holstein dairy cows (with initial body weight of 615±15 kg and three lactation number). Urea treatment decreased DM and NDF degradation lag time of processed wheat straw (P<0.05); however it had no effect on DM and NDF degradation lag time of sugarcane bagasse. The urea treatment resulted to increase in DM and NDF degradability rate of processed wheat straw (P<0.05), but had no effect on DM and NDF degradability rate of sugarcane bagasse. The potentially degradable fraction of DM and NDF of both experimental materials were increased by treatment (P<0.05). The effective degradability of DM and NDF of experimental roughages increased (P<0.05) after urea treatment from 35.69 and 21.69 to 44.04 and 29.12 percent, respectively for wheat straw and from 18.88 and 15.65 to 23.92 and 19.52 percent, respectively for sugarcane bagasse. According to the results of this experiment, urea treatment of roughages-feeds, especially wheat straw improves degradability of DM and NDF.
کلیدواژه‌ها [English]
- Chemical composition
- Degradability parameters
- Sugarcane bagasse
- Urea
- Wheat straw
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