Estimation the Relative Emphasis Production and Functional Traits on Optimum and Non-Optimom Conditions in Production System of Dairy Cows in Tehran

Esmailzadeh, Aysan and Seyed Sharifi, Reza and Hedayat Evrigh, Nemat and Savarsofla, Sima (2017) Estimation the Relative Emphasis Production and Functional Traits on Optimum and Non-Optimom Conditions in Production System of Dairy Cows in Tehran. Masters thesis, University of Mohaghegh Ardabili.

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Text (برآورد تأکید نسبی صفات تولیدی و عملکردی، در شرایط بهینه و نابهینه سیستم تولید گاوهای شیری استان تهران) Aysan Esmailzadeh.pdf Download (467kB) | Preview

Abstract

The aim of this study is assessment of the priority selection emphasis on characteris-tics in terms of optimized and non-optimized conditions of production system in dairy cows. 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. Economic value of a characteristic indicates the share of genetic growth of that characteristic to development of production system economic efficiency. In order to determine optimized replacement decision under different production conditions, dynamic planning is used. programming is a mathematical technique which divides a multi-stage problem into a series of independently soluble single-stage problems. Using dynamic planning as one of the optimization methods to realize future condition from the point of management variables of production system such as elimination and replacement policies, leads to unbiased estimation of economic values and relative importance. Using system analysis, system components dairy farm economic analysis of income and expenditure of each of these components were also divided into sub-sections. Then, by using the existing models and helping Compecon toolbox MATLAB programming language was used to simulate a bio-economic model.The objective function is to maximize net present value of livestock was in a planning horizon of 10 lactation. Dairy cows were defined with state variables include lactation number, milk production capacity and different states delays in conception. At each stage of production in dairy cows by the status of the 3 levels (low, medium and full production) with production of less than 5 thousand kg, 5 kg and more than 7 thousand to 7 thousand order of 0.02, 0.35 and 0.63 percent of the animals, respectively. And reproductive performance in four levels with a calving interval of 410, 450, 490 and 530 days was classified. Annual revenues and costs based of yearly herd was estimated to be equal 128144171/83 and 112335547/06 Rials. Maximum of revenues and costs was income from milk sales and the cost of nutrition. results showed that for a dairy cow for delay 40, 80 and 120 day delay in conception than ideal situation 410 days,was obtained economic losses of 5784972/34, 19450544/68 and 16153917/02 Rials, respectively. Relative importance of characteristics such as milk production,milk fat,lifetime production, mature live weight, increasing daily weight pre-weaning, increasing daily weight after weaning ,birth weight and the first calving age in non-optimized condition of production system are estimated respectively 43/85, 18/47, 0/0064, -0/406, 10/93, 35/69, 0/071, -3/05 and -7/54 percent and In optimized condition of production system are 47/90, 16/26, 0/0078, -1/04, 14/98, 24/94, -0/0095, -1/22 and -1/81 percent respectively.

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