Breeding objectives for beef cattle used in different production systems: 1. Model development

Livestock production science Pub Date : 2005-08-15 DOI:10.1016/j.livprodsci.2004.12.018

M. Wolfová , J. Wolf , J. Přibyl , R. Zahrádková , J. Kica

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引用次数: 61

Abstract

A bio-economic model was developed to evaluate utilization of beef bulls in a variety of production systems. The model can simulate life-cycle production of both beef and dairy cow herds with or without an integrated feedlot system. The Markov chain approach is used to simulate herd dynamics. The herd is described in terms of animal states and possible transitions among them. Equilibrium herd structures of the integrated production systems are calculated in their stationary states. The economic efficiency of each system is a function of biological traits of animals and of management and economic parameters. The model allows estimation of marginal economic values for 16 traits separately in each system. The economic weight for each trait or direct and maternal trait component in each selection group and breed of interest is then calculated as the weighted sum of the economic values for the trait in all production systems in which the selection group has an impact. Weighting factors for each system are computed as the product of the number of discounted expressions for direct and maternal trait components transmitted in that system by the selection group and the proportion of total cows belonging to each system.

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用于不同生产系统的肉牛的育种目标:模型开发

开发了一个生物经济模型来评估各种生产系统对肉牛的利用。该模型可以模拟有或没有综合饲养场系统的牛肉和奶牛群的生命周期生产。采用马尔可夫链方法模拟群体动力学。畜群是根据动物状态和它们之间可能的转换来描述的。计算了综合生产系统的稳态平衡群结构。每个系统的经济效率是动物的生物特性以及管理和经济参数的函数。该模型允许在每个系统中分别估计16个性状的边际经济值。然后计算每个选择组和感兴趣品种中每个性状或直系性状和母系性状组成部分的经济权重，作为该性状在所有生产系统中受选择组影响的经济价值的加权总和。每个系统的加权系数计算为选择组在该系统中传递的直接性状和母系性状成分的贴现表达数与属于每个系统的奶牛总数的比例的乘积。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Livestock production science

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