ANALYSIS OF VARIANCE COMPONENT AND HERITABILITY BETWEEN PURE BREED OF DUROC, PIÉTRAIN AND LANDRACE AND THEIR CROSS-BRED COMBINATION ON SOME PRODUCTIVITY TESTING TRAITS
Abstract
The objective of this study is to analyze genetic variance (GV), phenotypic variance (PV) and heritability (h2) between above breeds and their cross-bred on 2 traits of body weigh gain (BWG) and back fat thick layer (BFTL). The research was implemented on 1,718 individuals of 12 cross-bred combinations, and data was analysed by general matrix model. In the crosse-pair PxD: BWG trait had GV and h2 were equivalent in P, D and higher than cross-bred; PV of D was higher than P and cross-bred. BFTL had highest GV in D and lowest in P, but PV highest in P and lowest in cross-bred. However, h2 in cross-bred higher than P, D. In the cross-pair LD: BWG had GV and h2 highest in L, lowest in cross-bred, but PV highset in D, lowest in L. BFTL had PV highest in L, lowest in D, but PV highest in D, lowest in cross-bred. However, h2 in cross-bred higher than P and D. In the cross-pair PxL: BWG had GV and h2 highest in L, lowest in P, but PV highest and equivalent in P and cross-bred, lowest in L. BFTL had GV and PV hoghest in P, lowest in L. However, h2 of cross-bred and L was equivalent and higher P. These analysis results showed that, depending on different cross-pairs, different traits, the variance components and h2 have different fluctuations.