Chromosomal analysis of the water buffaloes and their crosses in the Philippines
1990
Mayid, M.A.
The karyotype of Philippine carabao (2n = 48) consisted of 6 metacentric, 4 submetacentric and 38 acrocentric chromosomes, including two sex chromosomes. The X chromosome was the largest acrocentric and the Y chromosome was small but not the smallest acrocentric chromosome. In Murrah buffalo (2n = 50) there are 5 meta and 5 sub metacentric chromosomes, 40 acrocentric, including the sex chromosomes. Chromosome pair 4 in the carabao karyotype was the 4/9 tandem fusion product of Murrah karyotype. All F1 hybrids had 2n = 49 chromosome complements. A single longest metacentric chromosome was also produced here by tandem fusion of one member of chromosome pair 4p and 9 which can serve as a marker to differentiate whether this is crossbred or not. The F2 animals comprised two populations carrying 2n = 49 and 2n = 50 chromosomes. There is greater percentage (60%) of 2n =50 chromosomes. The 2n =48 chromosomes was not observed, may be due to the limited number (10 animals) of samples. No chromosomal abnormalities in the animals with reproductive problem, such as repeat breeders were observed probably due to the small number of animals and use of ordinary Giemsa-staining technique. Further detail chromosome study using G and C banding methods were recommended to confirm the tandem fusion and to establish different types of chromosomal aberrations which can cause reproductive problems in water buffaloes.
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