مقایسه تاثیر‎ ‎مکمل‎ ‎بافر ترکیبی و بیکربنات سدیم‎ ‎بر‎ ‎عملکرد رشد‎ ‎و‎ ‎فراسنجه‌های شکمبه‌ای‎ ‎در‎ ‎گوساله‌های‎ ‎نر پروار‎ ‎هلشتاین

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش‌آموخته کارشناسی ارشد، گروه علوم دامی، دانشکدگان کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، ‏ایران

2 استاد، گروه علوم دامی، دانشکدگان کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، ایران

3 استادیار، گروه علوم دامی، دانشکدگان کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، ایران

چکیده

هدف از این پژوهش، مقایسه اثر بافر ترکیبی و بیکربنات سدیم بر عملکرد رشد و فراسنجه­های شکمبه­ای گوساله‌های نر پرواری هلشتاین با میانگین وزن ۱/۴۳±۸/۳۳۰ کیلو­گرم و سن 240 روز، تغذیه شده با جیره­ای پر­کنسانتره بود. آزمایش به مدت۹۰ روز به همراه ۱۰ روز عادت‌دهی در قالب طرح کاملا تصادفی با سه جیره آزمایشی با نسبت علوفه به کنسانتره 20 به 80 درصد و ۱۰ تکرار انجام گرفت. جیره­های آزمایشی شامل جیره شاهد (بدون بافر)، جیره پایه با یک درصد بیکربنات سدیم و جیره پایه با یک درصد بافر ترکیبی بودند. خوراک مصرفی روزانه، افزایش وزن ماهانه و گوارش­پذیری اندازه­گیری شد. خوراک مصرفی، تغییرات وزن و گوارش­پذیری تحت تاثیر جیره­های آزمایشی قرار نگرفت. بهترین ضریب تبدیل غذایی برای گوساله­های تغذیه شده با جیره حاوی مکمل بافر ترکیبی بود (۰۵/۰>P). افزایش وزن روزانه در گوساله­های تغذیه شده با بافر ترکیبی نسبت به گروه شاهد بیشتر بود (۰۵/۰>P). نیتروژن آمونیاکی مایع شکمبه در جیره­ شاهد نسبت به بافر ترکیبی بیشتر بود (۰۵/۰>P). pH مایع شکمبه گوساله­ها دو ساعت پس از مصرف خوراک در جیره شاهد کمترین بود (۰۵/۰>P). نتایج پژوهش حاضر نشان داد بافر ترکیبی مورد سنجش در مقایسه با بیکربنات سدیم در کنترل شرایط اسیدی شکمبه گوساله‌های تغذیه شده با جیره‌های پر کنسانتره عملکرد بهتری به خصوص از نظر بهبود ضریب تبدیل غذایی داشت و به نظر می‌رسد افزودن آن به چنین جیره‌هایی مفید باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Compairing the effect of supplementing a mixed buffer and sodium bicarbonate on ‎growth performance and rumen parameters of Holstein young bulls ‎

نویسندگان [English]

  • Behzad Ganji 1
  • Mehdi Dehghan banadaky 2
  • Farhang Fatehi 3
1 MSc. Graduate, Department of Animal Science, College of Agriculture & Natural Resources, ‎University of Tehran, Karaj, Iran
2 Professor, Department of Animal Science, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran
3 Assistant Professor, Department of Animal Science, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran
چکیده [English]

This study aimed to compare the effects of combined buffer and sodium bicarbonate on growth performance and ruminal parameters of Holstein young bulls with an average weight of 330.8±43.1 kg and an age of 240 days, fed with a high-concentrate diet. The experiment was conducted for 90 days with 10 days of habituation in a completely randomized design with three dietary treatments and 10 replications, and a forage: concentrate ratio of 20 to 80%. Experimental diets included a control diet (without buffer), a basal diet with 1% sodium bicarbonate, and a basal diet with 1% mixed buffer. Daily feed intake, monthly weight gain, and digestibility were measured. The experimental diets did not affect feed intake, weight changes, and digestibility. The best feed conversion ratio for bulls was in treatment of diet containing the mixed buffer supplement (P<0.05). Daily weight gain was higher in bulls fed with the combined buffer than that of the control group (P<0.05). Rumen ammonia nitrogen was higher in the control group than the bulls receiving mixed buffer (P<0.05). The pH of rumen fluid was lowest in the control group, two hours after feeding (P<0.05). The present study results showed that the mixed buffer had a better performance in controlling the rumen acidity of bulls fed with high concentrate diets compared to sodium bicarbonate, especially in terms of improving feed conversion ratio, and it seems to be necessary to add it to such diets.

کلیدواژه‌ها [English]

  • Ammonia nitrogen
  • Daily weight gain
  • pH
  • Dietary conversion ratio
  • Rumen fluid
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