The main objective of the livestock industry, as an economic production system, is to increase production efficiency through changes in performance and to increase economic productivity. Therefore, in designing genetic improvement programs for domestic animals, it is necessary to pay attention to recognizing the system of production and the factors affecting its performance and the profitability of systems, that is, revenues and costs. For estimation of market liquidity flow and economic returns, using a bio economic model, data on the revenues and costs was used of traditional and industrial cattle in Ardebil province during the years 2012-2016. The nourishment method based on the type of management was divided into two methods: traditional nourishment (in pasture) and industrial nourishment. The results of this study showed that the highest share of revenue and costs of nourishment units was related to milk sales and nutritional costs in both systems respectively. The investment risk level for industrial systems with different levels of milk production (high production, average production and low production) and the traditional system were estimated to be 0.032, 0.078, 0.030 and 0.013, respectively using standard deviation that these numbers represent the degree of deviation of the real result from the average result with medium returns which shows the high risk of investment in industrial dairy cattle compared to traditional dairy cattle. In both systems, the highest estimated relative significance was related to production traits, followed by survival and growth traits, respectively and the least value was related to reproductive traits.
Citation of This ArticleSeyedsharifi R, Esmailzadeh A, Hedayat Evrigh N, Savarsofla S, Seifdavati J: Determining the priority selection emphasis on characteristics in terms of optimized and non-optimized conditions of production system in dairy cows. Kafkas Univ Vet Fak Derg, 23 (6): 981-988, 2017. DOI: 10.9775/ kvfd.2017 AbstractThe aim of this study is assessment of the priority selection emphasis on characteristics in terms of optimized and non-optimized conditions of production system in dairy cows. Optimization is the approach of finding the best accessible value of a predefined objective function within a determined range of effective variables. In optimized conditions for cow future profitability, the decision to cull cattle from herd is based on future predicted profitability of cows. Dynamic planning is an efficient mathematical method which is used to study and optimization of multi-stage decision problems. One of the main challenges in estimating economic value of characteristics is inefficiency of production system. In this study, in order to estimating the economic values and relative importance of characteristics in efficient and inefficient conditions of production system, the average data of six Holstein herds was used which is recorded under supervision of breeding center. After optimizing production system for culling and replacement policies in the herd, a unit is added to the considered characteristic average in order to calculate the economic value of a characteristic after this changes, the production system optimized. The current value of the system calculated in optimized condition before and after changing characteristic and economic value of characteristics obtained from their difference. Relative importance of characteristics such as calving interval, milk production, milk fat, birth weight, mature live weight, increasing daily weight pre-weaning, increasing daily weight after weaning and the first calving age in non-optimized condition of production system are estimated respectively 2.06, 95.62, -4.34, -0.64, 1.90, 1.25, 1.93 and 2.22 percent and In optimized condition of production system are 0.42, 92.55, -0.642, 0.32, 2.00, 1.15, 1.81 and 2.37 percent respectively. Keywords: Dairy cows, Economic values, Iran, Non-Optimized, Optimized, Selection emphasis Süt İneklerinde Üretim Sisteminin Optimize Edilmiş ve Optimize Edilmemiş Koşulları Açısından Öncelik Seçiminin Belirlenmesi ÖzetBu çalışmanın amacı, süt ineklerinde üretim sisteminin optimize edilmiş ve optimize edilmemiş koşulları açısından öncelik seçiminin değerlendirilmesidir. Optimizasyon, önceden belirlenmiş bir objektif fonksiyonun erişilebilir en iyi değerini belirlenmiş etkili değişkenler aralığında bulma yaklaşımıdır. Optimize koşullarda ineklerin gelecekteki verimliliği için sürüden bir sığırın çıkarılması kararı ineklerin gelecekteki tahmin edilen verimliliğine bağlıdır. Dinamik planlama, çok aşamalı karar problemlerinin incelenmesi ve optimizasyonu için kullanılan etkili bir matematiksel yöntemdir. Özelliklerin ekonomi...
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