中国美利奴羊育种目标中性状边际效益的计算方法

METHOD FOR CALCULATING MARGINAL PROFITS OF TRAITS IN BREEDING OBJECTIVES FOR MERINO SHEEP IN CHINA

借助差额法推导出一系列细毛羊育种目标中性状边际效益的计算公式。并根据调查与研究，给出中国美利奴羊（新疆军垦型）计算边际效益的有关生物学、育种学和经济学参数，计算出各育种目标性状的边际效益。根据新疆军垦型羊群３个品系的不同特点，分别考虑它们的目标性状以及各性状的选择重要性。经统计分析得知，Ｂ品系的毛用、肉用和繁殖性状的相对选择重要性之比为３：１：１，Ｃ品系近似于５：２：３，而Ａ品系的相对选择重要性则介于Ｂ、Ｃ品系之间。

The formulas for calculating the marginal profits of the traits in the breedingobjecti ves for wool sheep have been deduced by the Difference Method.Biologic,genetic and hreeding parameters and economic values of Chinese Merino sheep typeJunken in Xinjiang area have been investigated, and marginal profits for traits indetermining the breeding objective of the population、were also calculated.The economicimportances of wool, meat and reproduction traits in line B and line C were nearly inthe proportion of 3.1.l and 5.2:3,respectively,and that of line A was betveen lineBand line C.