Íslenskar landbúnaðarrannsóknir - 01.03.1979, Qupperneq 88

Íslenskar landbúnaðarrannsóknir - 01.03.1979, Qupperneq 88
86 ÍSLENZKAR LANDBÚNAÐARRANNSÓKNIR TABLE 2. A-nalysis of Variance and Covariance. Source of Variation DF E(ms) or E(Cov). Sire S-1 (TÍ+K2S(i:a) +K3*(a) Individual/Sire Ö-S cr?+Kií(i:A) Year Y-1 ití+Kqif Residual N-O-Y-l (T? where: S = number of sires Ö = number of oífspring Y = number of years N = number of records K, Ki = coefficients calculated according to Harvey (1960). performed several times using a different number of records the Ki take different values. In the first run of Model (2), only rec- ords containing complete information on the ten traits included in the scoring index were used. All records where number of offspring per sire did not exceed three were exclu- ded from the analyses in this and all subs- equent runs. One of the traits involved, pace, was not performed at all by several of the ponies actually judged. They therefore obtained a score of 5.0 for that trait. This obviously causes markedly skew distribution of me- asurements. For estimation ofgenetic and phenotypic parameters concerning pace, those records containing a score less than 6 were eliminated before the second run on model (2). In the third run only those records containing complete information on the four body measurements in addition to the ten traits were used. Finally, only records on females were included to estimate the genetic paramet- ers. Data were not adjusted and the effect of age added into model (2). Information about number of records, number of offspring, number of sires and value of Ki for the four separate runs on model (2) is to be found in table 3. Estimation of heritability and correlations The heritability, genetic correlations and phenotypic correlations were estimated by use of a standard form of procedure (Falconer, 1960; Becker, 1975). The standard error of the heritability estimates was calculated from a formula given by Falconer (1963) and the stan- dard error of the estimated correlation co- efficients were calculated from the form- ula of Hammond and Nicholas (1972). TABLE 3. Numerical description of four runs on Model (2). No. No. No. Runs records offspring sires Ki K2 K3 Firstrun ................. 1 208 1 088 108 1.0082 1.1819 10.5387 Second run ............... 959 851 107 1.0981 1.1920 8.3902 Third run ................ 1 068 976 108 1.0713 1.1501 9.2700 Fourth run* .............. 817 717 105 1.0822 1.1904 7.2037 Effect of age included in the model.
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