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Madura cattle is a one of the native cattle that are genetically tolerant of tropical climates. Madura cattle are one of the beef cattle breeds in Indonesia. Madura cattle can be a superior breed, but improving growth trait in Madura cattle needs to be conducted. The early step that was needed was for detecting the genes which were involved in growth traits. The purpose of this research was for detecting GHR gene polymorphisms and its association with body weight of Madura cattle population in Indonesian Beef Cattle Research Station. This study used 110 DNA samples of Madura cattle that was collected from the experimental barn at Indonesian Beef Cattle Research Station. DNA samples were extracted by DNA extraction kit. Genotype of GHR gene was detected by PCR-RFLP method using AluI restriction enzymes. In this study, association genotype and body weight was analysed by univariate GLM method. The birth weight, weaning weight, yearling weight and 18 months weight of Madura cattle were 16.8±0.3 kg; 82.4±2.3 kg; 124.6±3.7 kg and 166.7±5.0 kg, respectively. The GHR genes of Madura cattle had 3 genotypes AA, AG and GG and genotype frequencies of GHR gene were 0.273 (AA), 0.373 (AG), 0.355 (GG), respectively. Whereas the allele frequencies of A was 0.459 and the allele frequencies of G was 0.541. Based on Chi-square (X2) analysis showed that the population sample was not disequilibrium. The result of association analysis was significant (P &lt;0.05) on weaning weight, yearling weight and 18 month weight. It was concluded that the GHR gene has potential as a genetic marker for growth traits and can be used as MAS in Madura cattle in Indonesian Beef Cattle Research Station.

Detection of GHR|AluI gene polymorphism and its association with body weight of Madura cattle in Indonesian Beef Cattle Research Station