Phenotypic correlations between assessed and measured body conformation traits of black and white cows

Abstract

The analysis of visually assessed and measured body conformation traits were based on the sample of 935 first calving black and white were daughters from 59 bull-sires. Proportion of Hoistein genes in the genotype of bulls and cows was 80 and 60 percentage approximately. Milk production was realized during period of six years on ten farms of agriculture combine from Belgrade. Results are processed by method of least squares (HARVEY, 1990). Linearly scored traits were about average using the scale from 1 to 9. Measured traits have shown expected values which represent investigated population. Phenotypic correlations were weak and strong with positive and negative coefficient in both group of traits. AH differences between bull-sires were statistically high significant (P lt 0,03), including all presented traits.

Analizom rezultata vizuelno procenjenih i merenih osobina telesne razvijenost obuhvaćeno je 935 prvotelki crno belih goveda koje su vodile poreklo od 59 bikova – očeva. Proporcija gena holštajna u genotipu bikova je prosečno iznosila oko 80% a krava ok 60%. Proizvodnja mleka je ostvarena u periodu od šest godina na 10 farmi PK "Beograd". Za obradu rezultata korišćen je model oca po metodi najmanjih kvadrata. Srednje vrednosti ocenjenih osobina su bile u rasponu od 5-6 što predstavlja prosečnu ispoljenost sa niskom varijabilnošću (CV - 16,5% za vezanost prednjeg vimena). Srednje vrednosti i varijabilnost merenih osobina bili su u granicama koje karakterišu genotipove crno-belih krava u ispitivanoj populaciji. Fenotipska povezanost između osobina se kretala od jako slabe do potpune sa manjim brojem negativnih koeficijenata. Rezultati analize varijanse su pokazali visoko značajne razlike (P lt 0,01) između bikova za sve navedene osobine.