The aim of this work was to assess the association between the hairless genotypes and
estimated breeding values (EBVs) for milk yield (MY), fat (FAT) and protein (PRT) content
in Valle del Belice dairy sheep breed. A data set from 465 randomly chosen unrelated
individuals was analyzed. EBV for MY, FAT and PRT contents were estimated by REML
analysis of a single trait repeatability animal model. The genotype effect on EBV was
assessed by ANOVA and by the Tukey–Kramer multiple comparison test. The PCR-SSCP
test showed the presence of CC and CT genotypes in Valle del Belice individuals. Some
differences in milk production traits between the genotypes were found. For MY,
individuals with CT genotype produced 1.5 times more daily milk than CC homozygotes.
Individuals with CC genotype showed eight times less FAT content and 1.7 times less PRT
content than the heterozygous. However, these differences were not statistically different,
probably due to the low frequency of the CT genotype. Considering our results,
polymorphisms of the hr gene do not directly influence production traits, but if further
studies confirm our hypothesis, the hr gene could be used in a marker assisted selection
program.
The aim of this work was to assess the association between the hairless genotypes andestimated breeding values (EBVs) for milk yield (MY), fat (FAT) and protein (PRT) contentin Valle del Belice dairy sheep breed. A data set from 465 randomly chosen unrelatedindividuals was analyzed. EBV for MY, FAT and PRT contents were estimated by REMLanalysis of a single trait repeatability animal model. The genotype effect on EBV wasassessed by ANOVA and by the Tukey–Kramer multiple comparison test. The PCR-SSCPtest showed the presence of CC and CT genotypes in Valle del Belice individuals. Somedifferences in milk production traits between the genotypes were found. For MY,individuals with CT genotype produced 1.5 times more daily milk than CC homozygotes.Individuals with CC genotype showed eight times less FAT content and 1.7 times less PRTcontent than the heterozygous. However, these differences were not statistically different,probably due to the low frequency of the CT genotype. Considering our results,polymorphisms of the hr gene do not directly influence production traits, but if furtherstudies confirm our hypothesis, the hr gene could be used in a marker assisted selectionprogram.
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