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جایگزینی بخشی از کنجاله سویا با منبع نیتروژن غیر پروتئینی آهسته رهش در گاوهای شیری: عملکرد و پیامدهای اقتصادی | ||
| علوم دامی | ||
| مقاله 17، دوره 30، شماره 117، اسفند 1396، صفحه 203-214 اصل مقاله (1.27 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/asj.2017.109965.1426 | ||
| نویسندگان | ||
| داود زحمتکش* 1؛ مقداد جهانی مقدم2 | ||
| 1استادیار گروه علوم دامی دانشگاه زنجان | ||
| 2باشگاه پژوهشگران جوان و نخبگان، واحد کرج، دانشگاه آزاد اسلامی، کرج | ||
| چکیده | ||
| هدف از این پژوهش، بررسی جایگزینی بخشی از کنجاله سویا با منبع نیتروژن غیر پروتئینی آهسته رهش در گاوهای شیری بر تولید شیر، ترکیب شیر و پیامدهای اقتصادی آن بود. بدین منظور، 44 رأس گاو شیرده با میانگین روزهای شیردهی 39±193 و میانگین تعداد زایش 1/4±1/3 به‌صورت تصادفی به دو تیمار آزمایشی (جیره شاهد (جیره حاوی کنجاله سویا) و جیره حاوی نیتروژن غیر پروتئینی آهسته رهش (حاوی 0/75 درصد ماده خشک جیره منبع نیتروژن غیر پروتئینی آهسته رهش)) اختصاص یافتند. جیره‌ها به‌صورت کاملاً مخلوط شده و در حد اشتها خورانده شدند. تولید شیر، ترکیبات شیر و نیتروژن اوره‌ای خون اندازه گیری گردیدند. تولید شیر، درصد چربی، درصد پروتئین، تعداد سلول های بدنی شیر و نیتروژن اوره ای خون بین دو تیمار تفاوت معنی‌داری نداشتند (0/05<P). سود مازاد بر هزینه خوراک در تیمار حاوی نیتروژن غیر پروتئینی آهسته رهش در مقایسه با تیمار شاهد به‌صورت معنی داری بالاتر بود (0/01>P). شبیه سازی اقتصادی، با استفاده از پاسخ تولید شیر مشاهده شده، نشان داد که تغییر در درآمد مازاد بر هزینه خوراک در تکمیل بخش باقی مانده با سبوس گندم بالاترین بود. تحت شرایط این پژوهش، جایگزینی بخشی از کنجاله سویا با منبع نیتروژن غیر پروتئینی آهسته رهش منجر به بهبود پیامدهای اقتصادی شد. | ||
| کلیدواژه‌ها | ||
| منبع نیتروژن غیر پروتئینی آهسته رهش؛ درآمد مازاد بر هزینه خوراک؛ تولید شیر؛ گاو شیرده | ||
| عنوان مقاله [English] | ||
| Partial replacement of soybean meal with slow releasing non protein nitrogen source in dairy cows: performance and economic implications | ||
| نویسندگان [English] | ||
| Davood Zahmatkesh1؛ Meghdad Jahani-Moghadam2 | ||
| 2Young Researchers and Elite Club, Karaj Branch, Islamic Azad University, Karaj, Iran. | ||
| چکیده [English] | ||
| The objective of this research was to evaluate the partial replacement of soybean meal with a slow-release source of non-protein nitrogen in the dairy cattle ration on milk production, milk composition and economic implications. Forty-four cows with an average 193±39 days in milk and the average parity number of 3.1 ± 1.4 were assigned to one of the following treatments: the control ration (containing soybean meal), and the experimental ration containing non-protein nitrogen slow-release (0.75% of diet DM as slow-release source of non-protein nitrogen). The diets were fed to cows as total mixed ration and ad libitum. Milk production, milk composition, and blood urea nitrogen were measured. Milk yield, milk fat and protein percentage, somatic cell count, and blood urea nitrogen were not influenced by treatments (P >0.05). Income over feed cost (IOFC) for the diet containing non-protein nitrogen slow-release was significantly higher compared with the control treatment (P<0.01). Economic simulations, using the observed milk yield response, indicated that the change in IOFC was the highest when the remaining of diet was completed with wheat bran. Under conditions of this study, partial replacement of soybean meal with slow-release source of non-protein nitrogen resulted in improved economic outcomes. | ||
| کلیدواژه‌ها [English] | ||
| slow releasing non protein nitrogen source, income over feed cost, milk production, milking cow | ||
| مراجع | ||
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