Genetic Studies on Conformation and Performance of IcelandicToelterHorses

Abstract

S-75007 Uppsila, S\\eden). Genetic studies on conformation and performance of Icelandic roelrcr horsrs. 111. Study on covariance matrices and breeding objectives by principal component analysis. Acta Agric Scand 31: 140449, 1981.The relationship among ten correlated traits \\as studied by means of principal component analysis. The first principal component contrasted horses wilh generally high versus low scores for all traits. The four largest principal components accounted for 91 c/r, 77%. 81%and 66% of the variation in the G , E, rG and rt covariance and correlation matrices, respectively. Principal component analyses were also used to examine the effects of variously defined vectors of relative \\eights, upon resulting selection indices. A'cy words: frirrcipol coitipoirerrrs, coiwritrrrce rvnrri.r.Acta Agric Scand 34 (1981)