[Influence of some dairy breeds on breeding value indexes of Latvian Brown bull mothers' candidates]
2003
Strautmanis, D. (Latvia Univ. of Agriculture, Sigulda (Latvia). Research Centre "Sigra")
Every year with the highest breeding value are selected as next bull mothers. In this investigation the best 1965 cows of all the Latvian Brown (LB) breed population were used and divided in some genealogical groups depending on the sires breed and blood. Cows with highest breeding value were from groups-having 100% blood sires of the Swedish Red & White and Latvian Brown breeds. In breeding work sire has the greatest influence as a breed. The average per cent of fat in milk ranged from 4.63% to 4.35%, but protein content from 3.50% to 3.24%. Correlation between these traits was r=+ 0.461 (P0.99). Correlation between separate breeding indexes was too high - r=0.624-0.964 (P0.999).
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