Quantitative trait loci affecting lactose and total solids on chromosome 6 in Brazilian Gir dairy cattle |
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| Authors: | Silva A A Azevedo A L S Gasparini K Verneque R S Peixoto M G C D Panetto B R Guimarães S E F Machado M A |
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| Affiliation: | Departamento de Zootecnia, Universidade Federal de Vi?osa, Vi?osa, MG, Brasil. |
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| Abstract: | Fourteen Brazilian Gir sire families with 657 daughters were analyzed for quantitative trait loci (QTL) on chromosome 6 affecting lactose and total solids. Cows and sires were genotyped with 27 microsatellites with a mean spacing between markers of 4.9 cM. We used a 1% chromosome-wide threshold for QTL qualification. A QTL for lactose yield was found close to marker MNB66 in three families. A QTL for total solid yield was identified close to marker BMS2508 in three families. A QTL for lactose percentage, close to marker DIK1182, was identified in two families. A QTL for total solid percentage, close to marker MNB208, was identified in four families. These QTLs could be used for selection of animals in dairy production systems. |
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