Experimental chimaerism in sheep

Composite sheep embryos (N = 110) were produced by aggregation of blastomeres from 2-, 4- or 8-cell embryos. Each composite embryo consisted of equal numbers of blastomeres from 2-8 parent embryos, the total cell number ranging from one quarter of the normal cell number to 8 times the normal cell nu...

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Bibliographic Details
Published inJournal of reproduction & fertility Vol. 70; no. 1; pp. 347 - 351
Main Authors Fehilly, C B, Willadsen, S M, Tucker, E M
Format Journal Article
LanguageEnglish
Published England 01.01.1984
Subjects
Animals
Blastomeres - physiology
Cell Aggregation
Chimera
Cleavage Stage, Ovum - physiology
Embryo Transfer
Genetic Techniques
Sheep - genetics
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Summary:Composite sheep embryos (N = 110) were produced by aggregation of blastomeres from 2-, 4- or 8-cell embryos. Each composite embryo consisted of equal numbers of blastomeres from 2-8 parent embryos, the total cell number ranging from one quarter of the normal cell number to 8 times the normal cell number. The embryos were embedded in agar and transferred to ligated sheep oviducts to allow development up to the early blastocyst stage. Of the 101 embryos subsequently recovered, 77 had formed normally organized blastocysts and 74 of these were transferred to 51 recipients. Thirty-eight recipients went to full term, producing a total of 53 lambs. Of the 48 lambs which survived to be blood typed at 60 days of age, 36 were judged to be chimaeric on the basis of their blood type and/or on the basis of external features. The proportion of chimaeras was larger amongst the lambs produced from composite embryos of the normal number of cells or more (25/26) than amongst lambs produced from composite embryos of less than the normal cell number (11/22).
ISSN:0022-4251
1470-1626
1741-7899
DOI:10.1530/jrf.0.0700347