Genetic grid method - Genetic grid method

…There are two methods for progeny testing of dairy cattle: the mother-daughter comparison method, in which the performance of the offspring is compared to that of the mother, and the synchronous comparison method, in which the performance of the offspring is compared to that of other offspring of the same generation. There are two methods for mother-daughter comparison: the genetic grid method and the sire index method. The genetic grid method involves plotting points on graph paper with the mother's performance on the horizontal axis and the daughter's performance on the vertical axis, and estimating the male's ability based on the distribution of these points. The sire index method involves calculating an index ( S ) from the daughter's performance ( D ) and the mother's performance ( M ) to evaluate superiority or inferiority, and the representative Hansson & Yapp formula is expressed as S = 2 D - M. …

*Some of the terminology explanations that refer to the "Genetic Square Method" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…乳牛の後代検定法としては子の成績を母の成績と比較して判定する母娘比較法と，同期の他子畜群と比較評価する同期比較法とがある。母娘比較法には遺伝方眼法と種雄指数法があり，遺伝方眼法は方眼紙の上に母の成績を横軸に娘の成績を縦軸にとって点を打ち，その分布によって雄の能力を推定する方法である。種雄指数法は娘の成績(D)と母の成績(M)の値から指数(S)を算出し優劣の評価をするもので，代表的なハンソン=ヤップ(Hansson & Yapp)の式はS＝2D－Mで表される。…

※「遺伝方眼法」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報