نوع مقاله : مقاله پژوهشی
نویسندگان
1 نویسنده مسئول، گروه علوم دامی، دانشکده کشاورزی، دانشگاه صنعتی اصفهان، اصفهان، ایران.
2 گروه علوم دامی، دانشکده کشاورزی، دانشگاه صنعتی اصفهان، اصفهان، ایران.
3 گروه علوم دامی، دانشکده کشاورزی، دانشگاه بوعلی سینا همدان، همدان، ایران.
چکیده
هدف از این مطالعه، برآورد ارزشهای اقتصادی برای مازاد خوراک مصرفی و برخی از صفات تولیدی و عملکردی در گاو شیری هلشتاین ایران بود. برای این منظور، ازمدل‌سازی زیست-اقتصادی صفت به صفت و یا چندصفته و دادههای تولیدی و اقتصادی استفاده شد. این دادهها از هفت گله بزرگ گاو شیری در سال 1399 جمعآوری شد. ارزش اقتصادی مازاد خوراک مصرفی در چهار گروه مختلف سنی محاسبه شد. جیرهها برای گروههای مختلف با استفاده از نرم‌افزار CNCPS تنظیم شدند. ضرایب اقتصادی (حاصل‌ضرب ارزشهای اقتصادی در بیانهای ژنتیکی تنزیل‌یافته، برحسب ریال و یک گاو در سال) به‌صورت میانگین در سطح گلههای مورد بررسی برای یک کیلوگرم تولید شیر 14280 ریال، یک کیلوگرم چربی شیر 291060 ریال، برای یک کیلوگرم پروتئین شیر 232260 ریال، برای یک کیلوگرم مازاد خوراک مصرفی 790860- ریال، برای یک ماه ماندگاری 702588 ریال و برای یک روز باز 113820- ریال برآورد شدند. آنالیز حساسیت نشان داد که قیمت اقلام خوراکی کنسانترهای نسبت به علوفهای اثر بیش‌تری بر ارزش اقتصادی مازاد خوراک مصرفی دارند. در تحلیلهای ژنتیکی-اقتصادی، صفت تولید شیر با تأکید نسبی 50 درصد مهم‌ترین صفت در اصلاح نژاد گاو شیری ایران بود، در حالی‌که تأکید نسبی بازده خوراک مصرفی تنها حدود 5 درصد بود. نتایج این پژوهش اطلاعات ارزشمندی درباره ارزشهای اقتصادی صفات فراهم میکند که میتواند در تکمیل شاخص انتخاب ملی و تحلیلهای هزینه-فایده مورداستفاده قرار گیرد.
کلیدواژه‌ها
عنوان مقاله [English]
Estimating the economic value of residual feed intake using bioeconomic modeling
نویسندگان [English]
- Sara Nadri 1
- Ali Sadeghi-Sefidmazgi 2
- Gholam Reza Ghorbani 2
- Pouya Zamani 3
1 Department of Animal Sciences, College of Agriculture, Isfahan University of Technology, Isfahan, Iran
2 Department of Animal Science, Faculty of Agriculture, Isfahan University of Technology, Isfahan-Iran
3 Department of Animal Science, Faculty of Agricultura, Bu-Ali Sina University, Hamedan, Iran.
چکیده [English]
The aim of this study was to estimate the economic values for residual feed intake and some production and performance traits in Iranian Holstein dairy cow. For this purpose, trait by trait or multiple traits of bio-economic modeling along with production and economic data were used. These data were collected from seven large herds of dairy cows in 2020. The economic values of the residual feed intake was calculated in four different age groups. The diets of different groups were formulated using CNCPS software. Index economic weights (multiplication of the economic values by discounted genetic expressions, in Rial and one cow per year) on average at the level of the studied farms were estimated to be IRR 14280 per kg of milk yield; IRR 291060 per kg of fat yield; IRR 232260 per kg of protein yield; IRR - 790860 per kg of residual feed intake; IRR 702588 per month of longevity and IRR- 113820 per day of days open. The sensitivity analysis showed that the price of concentrate ingredients has a greater effect on the economic value of the residual feed intake than of forage ingredients. In the genetic- economic analysis, the milk production with a relative emphasis of 50 percent was the most important trait in the breeding of Iranian dairy cows, while the relative emphasis on feed efficiency was only about 5 percent. The results of this research provide valuable information for economic values of traits that can be used to complete the national selection index and cost-benefit analysis.
کلیدواژه‌ها [English]
- dairy cow
- economic weight
- feed efficiency
- relative emphasis
- sensitivity analysis
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