In vitro embryo production and embryo vitrification of genetically superior cows that culled inevitably due to health problems can accelerate genetic progress. This study was carried out to investigate whether maternal age and health status effects of high genetic merit cows affect
cryosurvival and developmental competence of IVP embryos. In this sense, the effects of ageing and four common culling causes of dairy cows [repeat breeding (RPB), udder problems (UPM), chronic endometritis (CRE), and lameness (LAM)] on in vitro embryo development, and in vivo developmental
competence after embryo vitrification were evaluated. The mean number of oocytes obtained per cow did not vary significantly between donors indifferent groups. Cleavage rates in RPB (86.0±4.2%), SEN (81.3±2.5%) and CRE (77.6±6.3%) cows which were comparable to control
(95.9±1.5%) but were significantly higher than the related rate of UPM donors (50.6±2.6%). Importantly, there was no significant difference between the blastocyst rates of different groups. Mean overall survival rate was not different between the groups and was not affected by
the blastocyst production rate. There was no significant difference between pregnancy rates of different groups. The results of the present study indicated that in cattle, neither ageing, nor these four diseases affect ovarian potential in terms of the yield and quality of in vitro embryo
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Document Type: Research Article
Publication date: November 1, 2013
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CryoLetters is a bimonthly international journal for low temperature sciences, including cryobiology, cryopreservation or vitrification of cells and tissues, chemical and physical aspects of freezing and drying, and studies involving ecology of cold environments, and cold adaptation
The journal publishes original research reports, authoritative reviews, technical developments and commissioned book reviews of studies of the effects produced by low temperatures on a wide variety of scientific and technical processes, or those involving low temperature techniques in the investigation of physical, chemical, biological and ecological problems.