نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه علوم دامی، دانشکده علوم و مهندسی کشاورزی، دانشگاه رازی، کرمانشاه.
2 استادیار گروه علوم دامی، دانشکده علوم و مهندسی کشاورزی، دانشگاه رازی، کرمانشاه.
3 دانشیارگروه علوم دامی، دانشکده علوم و مهندسی کشاورزی، دانشگاه رازی، کرمانشاه.
چکیده
اثر افزودن عصاره شیرینبیان (عصاره) بر عملکرد رشد، فراسنجههای تخمیر و جمعیت پروتوزآیی شکمبه در برههای پرواری با استفاده از 28 راس بره نر مهربان با وزن 1/75±36/45 کیلوگرم در قالب طرح کاملاً تصادفی با چهار تیمار و هفت تکرار بررسی شد. تیمارهای آزمایشی شامل شاهد (جیره پایه بدون عصاره شیرینبیان) و سه تیمار به‌ترتیب شامل جیره پایه+ پنج، 10 و 25 میلی‌گرم عصاره شیرینبیان به‌ازای هر کیلوگرم ماده خشک جیره بود. جیره پایه برهها 30 درصد کاه و70 درصد کنسانتره بود که به‌صورت مصرف در حد اشتها در اختیار دام قرار داده شد. برههای تغذیه‌شده با جیرههای حاوی 25 میلی‌گرم عصاره، افزایش وزن روزانه بیش‌تر و ضریب تبدیل بهتری داشتند (0/05>P). افزودن 25 میلی‌گرم عصاره سبب افزایش pH مایع شکمبه شد (0/05>P). کل گاز تولیدی در برههای دریافت‌کننده پنج و 25 میلی‌گرم عصاره بیش‌تر از سایر گروه‌ها بود (0/05>P). تولید متان تحت تأثیر افزودن عصاره به جیره قرار نگرفت. تغییرات انرژی قابل متابولیسم، ماده آلی تجزیه شده و اسیدهای چرب فرّار برآوردشده در جیرههای حاوی پنج و 25 میلی‌گرم عصاره بیش‌تر از سایر تیمارها بود (0/05>P). جمعیت کل پروتوزوآیی شکمبه و هم‌چنین تعداد انتودینه با تغذیه جیرههای حاوی عصاره کاهش یافت (0/05>P)، اما شمار پروتوزوآیی ایزوتریشیدا افزایش یافت. براساس نتایج این پژوهش، افزودن 25 میلی‌گرم در کیلوگرم عصاره شیرینبیان به جیره، فرایند متابولیسم شکمبه و عملکرد برههای پرواری را بهبود بخشید، اما بر میزان تلفات انرژی به شکل متان اثری نداشت.
کلیدواژه‌ها
عنوان مقاله [English]
The effect of licorice extract on growth performance of fattening lambs, fermentation parameters and rumen protozoan population
نویسندگان [English]
- Ameneh Naseri Moghadam 1
- Mohammad Ebrahim Nooriyan Soroor 2
- Fardin Hozhabri 3
1 . M.SC Graduated, Animal Science Department, Faculty of Science and Agricultural Engineering, Razi University, Kermanshah, Iran
2 Assistant Professor, Animal Science Department, Faculty of Science and Agricultural Engineering, Razi University, Kermanshah, Iran
3 Associated Professor, Animal Science Department, Faculty of Science and Agricultural Engineering, Razi University, Kermanshah, Iran
چکیده [English]
In order to investigate the effect of licorice extract (LE) on growth performance, fermentation parameters, and rumen protozoan population in fattening lambs, 28 male lambs weighing 36.45 ± 1.75 kg in a completely randomized design with four treatments and seven replicates were used. Experimental treatmeشnts included: control, basic diet without licorice extract, and treatments one to three included basic diet plus five, 10 and 25 mg of LE per kilogram of DM. The ratio of forage to concentrate was 30:70, which was given to the animals as per their appetite. Adding 25 mg of the extract to the diet increased the daily gain and improved the feed conversion ratio (P<0.05). The pH of rumen fluid and gas production increased at the level of 25 mg of extract (P<0.05). Methane production was not affected by adding LE to the diet. The changes in metabolizable energy, degraded organic matter and concentration of volatile fatty acids in diets containing 5 and 25 mg of LE were more than other groups (P<0.05). The total population of protozoa as well as the number of Entodinia decreased by feeding diets containing LE (P<0.05) but the number of Isotrichida increased, significantly. Based on the results of this research, adding 25 mg/kg of licorice extract to the diet improves the rumen metabolism and the performance of fattening lambs, but it had no effect on the amount of energy loss in the form of methane.
کلیدواژه‌ها [English]
- Degradability
- gas production
- methane production
- metabolizable energy
- volatile fatty acids
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