Manee Archawaranon
Faculty of Science, Ramkhamhaeng University, Bangkok
ABSTRACT
Hill Mynah Gracula religiosa is a monomorphic bird of which the discrimination of sex is a crucial problem in captive breeding programs. In the past ten years, the wild population of the two subspecies found in Thailand, G. r. intermedia and G. r. religiosa, have drastically decreased due to the demand of the pet market to trade them as talking birds. Sexing Hill Mynah will be an important part in breeding them in captivity. Various methods had been experimented to sex them. Best of all was to obtain sex chromosomes from feather pulp. Male is the homogametic sex (ZZ) whereas female is the heterogametic sex (ZW). To identify Z and W chromosomes in Hill Mynah is undoubtedly an easy task since Z chromosome is nearly twice the size of W chromosome. It is subtelocentric and medium in size of macrochromosomes or the same size as pairs 4, 5, 6 while W chromosome is submetacentric and smaller, the same size as pairs 7, 8, 9. The diploid chromosome number of Hill Mynah was found to be 80. The karyotype consisted of ten pairs of macrochromosomes, nine pairs of autosomes and one pair of sex chromosome and thirty pairs of microchromosomes. Captive breeding of Hill Mynahs in Thailand is no longer perplexed when sex identification is ultimately possible.
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How to cite this article
Manee Archawaranon, 2004. Rapid Sexing Hill Mynah Gracula religiosa by Sex Chromosomes. Biotechnology, 3: 160-164.
DOI: 10.3923/biotech.2004.160.164
URL: https://scialert.net/abstract/?doi=biotech.2004.160.164
DOI: 10.3923/biotech.2004.160.164
URL: https://scialert.net/abstract/?doi=biotech.2004.160.164
REFERENCES
- Archawaranon, M., 2002. Zoogeography of various hill mynah phenotypes in Thailand. J. Biol. Sci., 2: 645-647.
CrossRefDirect Link - Archawaranon, M. and B. Techatraisak, 2002. Subspecific size variation in the hill mynahs Gracula religiosa in Thailand. J. Biol. Sci., 2: 785-788.
CrossRefDirect Link - Levan, A., K. Fredga and A.A. Sandberg, 1964. Nomenclature for centromeric position on chromosomes. Hereditas, 52: 201-220.
CrossRefDirect Link - Archawaranon, M. and R.H. Wiley, 1988. Control of aggression and dominance in white-throated sparrows by testosterone and its metabolites. Horm. Behav., 22: 497-517.
PubMedDirect Link - Shields, G.F., G.H. Jarrell and E. Redrupp, 1982. Enlarged sex chromosomes of woodpeckers (Piciformes). Inst. Aectic Biol. Div. Life Sci., 99: 767-771.
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