THE FINE STRUCTURE OF CHROMOSOMES IN BOVINE PRIMORDIAL OOCYTES

in Reproduction

It is well known that the sequence of nuclear changes which takes place during the differentiation of the oocyte is interrupted for a relatively lengthy period towards the end of meiotic prophase. This generally occurs with the onset of the diplotene phase, although in the primordial oocytes of some mammals it is superseded by the dictyate phase (see Baker & Franchi, 1967b). The meiotic division is normally only resumed shortly before ovulation, which indicates that for a particular oocyte the `resting' period may last from a few weeks to many years (Brambell, 1956; Franchi, Mandl & Zuckerman, 1962).

On the basis of histological observations, however, certain authors have claimed that the oocytes in the cow `rest' in the pachytene stage (Henricson & Rajakoski, 1959; Rajakoski, 1965; Erickson, 1966). They consider that the diplotene stage does not appear until the

If the inline PDF is not rendering correctly, you can download the PDF file here.

 

     An official journal of

    Society for Reproduction and Fertility

 

Sept 2018 onwards Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 117 23 5
PDF Downloads 111 39 6