Published in Scientific Papers. Series D. Animal Science., Vol. LVI
Written by Horia GROSU, Sorin LUNGU, Pascal Anton OLTENACU
The procedures used on genetic evaluation in dairy cattle are presented, during the last century. These procedures have evolved greatly over the years, from the simple dam-daughter comparison to animal model, from single trait to multiple trait analysis, and from lactation to test-day model. Nowadays, more emphasis is put on the incorporation marker genetic information, in order to get so named GEVB-genomic breeding value. From historical point of view, there are four category of methods: 1) Methods based on averages (1902-1952); 2) methods based on selection index procedure (B.L.P;1952-1970.); 3) Methods based on mixed model equations (B.L.U.P.; 1971-2000) and 4) Methods based on BLUP and Genomics (2001-present). The aim of this paper is to give an overview of the genetic evaluation methods in dairy cattle, starting with first category of methods: ’’the Methods based on averages’’ or Daughter-Dam Comparisons. This group of methods cover the period 1906-1950, and take in account the following 12 indexes. For each index the formula is given and also the main advantages and disadvantages are presented.
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daughter-dam comparison
