Publication: Synaptomenal complex analysis of four breeds of Bos taurus taurus x B. taurus indicus hybrids
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Date
2000-12-01
Advisor
Coadvisor
Graduate program
Undergraduate course
Journal Title
Journal ISSN
Volume Title
Publisher
Hereditas-distribution
Type
Article
Access right
Acesso aberto
Abstract
The synaptonemal complex (SC) was analyzed in four F1 hybrids of Bos taurus taurus and B. taurus indicus including Gyr-Simmental (G-S), Nelore Simmental (N-S), Gyr-Holstein-Friesian (G-H) and Nelore-Piemontese (N-P). We analysed the frequency of various types of SC abnormalities and the frequency of cells with SC abnormalities. The results were compared with similar observations made on purebred animals. All the animals studied possessed 29 autosomal and one sex bivalent. The frequency of cells with abnormalities in the hybrids were 28.0% in the N-P, 29.1% in the G-S, 33.3% in the N-S and 40.0% in the G-H. The frequency of cells with abnormalities in the four hybrids was 31.5%; 57.9% of these abnormalities occurred in zygotene and 42.0% occurred in pachytene. The comparisons among the hybrids and among the hybrids and their parental breeds showed that the only significant difference was between Gyr and Gyr-Holstein-Friesian animals. Some aspects of the relationship between the frequency of cells with anomalies and the fertility of hybrids are discussed.
Description
Keywords
Animal cell, Animal experiment, Animal genetics, Animal tissue, Autosome, Breeding, Cattle, Cattle disease, Chromosome bivalent, Comparative study, Gene frequency, Genetic analysis, Hybrid, Male, Male infertility, Nonhuman, Testis, Animals, Breeding, Cattle, Cells, Cultured, Chimera, Chromosomes, Cryptorchidism, Female, Gene Frequency, Male, Meiosis, Synaptonemal Complex, Animalia, Bos taurus, Friesia, Mammalia
Language
English
Citation
Hereditas, v. 133, n. 1, p. 73-79, 2000.
