Morphological aspects of in vivo cleavage in Myocastor coypus (coypu) |
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Authors: | Felipe A E Teruel M T Cabodevila J A Callejas S S |
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Institution: | Address of authors: Areas de Ciencias Morfológicas y de Reproducción, Núcleo FISFARVET, Facultad de Ciencias Veterinarias, UNCPBA, B7000GHG-Tandil, Buenos Aires, República Argentina;Corresponding author: Tel.: 02293–442267;fax: 02293–442267;e-mail: |
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Abstract: | The objective of the present work was to characterize the in vivo cleavage stage of Myocastor coypus embryos. For this purpose a colpocytological follow-up and controlled mating of 18 females were performed. Specimens from the beginning of the first cleavage to the acquisition of a morula appearance were considered to be in cleavage stage. Embryos in cleavage were collected between days 3 and 6 post-coitus. Of the collected embryos, 80% presented an even number of blastomeres and the remaining 20% an odd number. Embryos from 3 to 7 cells were blastomere associations in a spherical disposition within the zona pellucida. Blastomeres were spherical or ovoid, presenting slight flattening in areas contacting with other blastomeres. Embryos of 8 and 9 cells were as a group of blastomeres slightly elongated, surrounded by a spherical zona pellucida. The percentage of peri-vitelline space occupied by the embryonic mass ranged from 74.1 to 95.8% for all the substages. The cleavage pattern, developed in the oviduct, was of a rotational holoblastic type and asynchronic. |
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