title: Deep freezing of cattle embryos in glass ampules or French straws.
abstract: Ninety four cow embryos recovered on day 7-8 after onset of oestrus were frozen by the "Two Step" freezing procedure: 49 in pyrex glass ampules and 45 in .25 ml French semen straws. The overall survival rate was 33.7% (36.2% for embryos frozen in glass ampules; 31.1% for embryos frozen in plastic straws). 45.2% of transferred embryos resulted in pregnancies (35.7% after freezing in glass ampules v.s 52.9% after freezing in plastic straws).
authors.affiliation: Department of Obstetrics and Animal Reproduction, Faculty of Veterinary Medicine, 45 rue des Vétérinaires, 1070, Brussels, Belgium.
authors.forename: A
authors.initials: A
authors.lastname: Massip
authors.forename: P
authors.initials: P
authors.lastname: Van der Zwalmen
authors.forename: F
authors.initials: F
authors.lastname: Ectors
authors.forename: R
authors.initials: R
authors.lastname: De Coster
authors.forename: G
authors.initials: G
authors.lastname: D'Ieteren
authors.forename: C
authors.initials: C
authors.lastname: Hanzen