نوع مقاله : مقاله پژوهشی
نویسندگان
- رضا کریمی 1
- آرمین توحیدی 2
- مهدی گنج خانلو 3
- سپده خویی 4
- حمید قاسم زاده نوا 5
- امیر علیجانی 6
- محمدجواد مظفری 7
1 دانشجوی دکتری، گروه علوم دامی، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران، کرج
2 استاد، گروه علوم دامی، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران، کرج
3 دانشیار، گروه علوم دامی، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران، کرج
4 استاد، بخش شیمی پلیمر، دانشکده شیمی، دانشگاه تهران، تهران
5 دانشیار، گروه مامایی و بیماری های تولیدمثل دام، دانشکده دامپزشکی، دانشگاه تهران
6 دستیار، گروه مامایی و بیماری های تولیدمثل دام، دانشکده دامپزشکی، دانشگاه تهران
7 دستیار گروه مامایی و بیماری های تولیدمثل دام، دانشکده دامپزشکی، دانشگاه تهران
چکیده
هدف آزمایش حاضر ارزیابی تأثیر تغذیه یک جیره گلوکوژنیک بر محور سوماتوتروپیک گاو تازهزای هلشتاین بود. در این مطالعه از 16 راس گاو تازهزا در قالب طرح کاملاً تصادفی با دو تیمار و هشت تکرار استفاده شد. در تیمار جیره گلوکوژنیک، گاوها روزانه 600 گرم مکمل گلوکز عبوری به‌صورت سرک دریافت میکردند. در تیمار شاهد گاوها روزانه بهمقدار مشابهی گلوکز و مواد پوشش گلوکز عبوری (به‌طورعمده چربی) دریافت میکردند. جیرههای آزمایشی از روز چهار تا 30 بعد از زایش تغذیه شد. مصرف ماده خشک و تولید شیر به‌صورت روزانه ثبت شد. نمونههای خون در روزهای چهار، 15 و 29 بعد از زایش از سیاهرگ دمی گرفته شد. نتایج نشان داد از نظر مقدار تولید شیر، مقدار شیر تصحیح‌شده براساس انرژی و 5/3 درصد چربی، مصرف ماده خشک و گلوکز خون بین دو تیمار تفاوت معنیدار وجود ندارد. جیره گلوکوژنیک سبب افزایش معنیدار انسولین و افزایش عددی IGF-1 خون شد (05/0P<). گاوهایی که جیره شاهد دریافت کردند، کاهش معنیداری در غلظت IGF-1 نشان دادند (05/0P<) اما این کاهش در گاوهایی که جیره حاوی مکمل گلوکوژنیک دریافت کردند مشاهده نشد. نتایج این پژوهش نشان داد تغذیه مکمل‌های گلوکوژنیک می‌تواند بر محور سوماتوتروپیک گاوهای تازهزا اثر گذاشته و سبب افزایش بازچرخش (ترنآور) گلوکز و افزایش انسولین خون و بهبود نسبی سطح IGF-1 خون شود.
کلیدواژه‌ها
عنوان مقاله [English]
The effect of feeding a glucogenic dietary supplement during early lactation on somatotropic axis of dairy cows
نویسندگان [English]
- Reza Karimi 1
- Armin Towhidi 2
- Mahdi ganjkhanlou 3
- Sepideh Khoee 4
- Hamid Ghasemzadeh-Nava 5
- Amir Alijani 6
- Mohamadjavad Mozafari 7
1 Ph.D. of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
2 professor,, Dept. of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
3 Associate Prof., Dept. of Animal Science, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
4 Professor, Department of Polymer Chemistry, Faculty of Chemistry, University of Tehran, Tehran
5 Associate Professor, Department Theriogenology, Faculty of Veterinary Medicine, University of Tehran
6 Resident, , Department Theriogenology, Faculty of Veterinary Medicine, University of Tehran
7 Resident,و Department Theriogenology, Faculty of Veterinary Medicine, University of Tehran
چکیده [English]
The aim of the present experiment was to evaluate the effect of feeding a glucogenic diet on the somatotropic axis of early lactation Holstein dairy cows. Sixteen fresh cows were used in a completely randomized design with two treatments and eight replicates in each treat. In the treatment of glucogenic diet, cows received 600 g of encasulated glucose daily as top dressed. In the control treatment, the cows received daily the same amount of glucose and coating material (mainly fat). Experimental diets were fed from day 4 to 30 after calving. Milk production and dry matter intake were recorded daily. Blood samples collected on days 4, 15 and 29 after parturition from coccygeal vein. The results show that there is no significant difference between treatments in terms of milk yield, energy corrected milk yield, 3.5% fat corrected milk yield, dry matter intake and blood glucose concentration. The glucogenic diet caused a significant increase in blood insulin (P<0.05) and a numerical increase in blood IGF-1 (P<0.15). Cows that received control diet showed a significant decrease in IGF-1 concentration (P<0.05) but no significant decrease was observed for cows received diet containing glucogenic supplement. The results of this study showed that feeding a glucogenic supplements can affect the somatotropic axis of early cows and cause an increase glucose turnover and blood insulin and relative improvement of blood IGF-1 levels.
کلیدواژه‌ها [English]
- "؛ dairy cow"؛
- "؛ glucose"؛ glucogenic diet"؛ Insulin"؛
- "؛ somatotropic axis"
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