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Synaptonemal complex analysis of hybrid cattle. I. Pachytene substaging and the normal full bloods
A E Dollin1, J D Murray, C B Gillies
1Commonwealth Scientific and Industrial Research Organisation, Division of Animal Production, Blacktown, Australia.
Genome
|October 1, 1989
Abstract:
Meiotic chromosome pairing abnormalities in full-blood and hybrid Bos taurus and B. indicus cattle have been surveyed by electron microscopy of pachytene synaptonemal complex spreads. In this paper the full-blood spreads are described in detail, including the use of XY and nucleolar morphology and other measured parameters for pachytene substaging. Pairing abnormalities were observed in up to 9% of the full-blood spreads. Most of these pairing abnormalities (83%) occurred in early-pachytene spreads, suggesting that the mechanism of synaptic adjustment may operate in cattle.