Abstract
Investigations into LDH-A and DR-D4 genes polymorphism, neurotransmitter values and cytogenetic indices of 3 sexed pigeon breeds; non-racing pigeons, (wild rock), racing long distances pigeons (Jan Aarden) and racing short distances pigeons (Janssen) have been performed. The long-distances pigeon showed the highest brain neurotransmitters concentration (p<0.001) among pigeon breeds. Both LDH-A and DR-D4 genes polymorphism indicate the presence of different biodiversity values among pigeon breeds. The variations appeared on the position length 389bp for LDH-A polymorphism, and on two positions length of 418bp and 524bp for DR-D4 polymorphism of long distances male pigeon indicate the presence of unique diversity and overall differences in the amino acids structure in this breed. The protein sequence of both genes showed that in the position of 60 for LDH-A gene the amino acid K (lys) was converted to E (glu), while, in the positions of 117 and 153 for DR-D4 gene the amino acid R (arg) and L (leu) were converted to S (ser) and F (phe) only in long distances male pigeon compared to the other breeds. Moreover, there were slight differences in cytogenetic indices detected among the three pigeon breeds. It can be concluded that both DR-D4 and LDH-A genes polymorphism and neurotransmitters estimations in the brain tissue of racing pigeon would be useful indices for the differentiation and genetic characterization of pigeon breeds and provide a foundation for developing sustainable genetic improvement and conservation programs of the breeding and selecting racing pigeon breeders.
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