Animal Reproduction (AR)
Animal Reproduction (AR)
Original Article

Corpus luteum diameter and embryo developmental stage are associated with pregnancy rate: data analysis from 17,521 embryo transfers from a commercial in vitro bovine embryo production program

A.M. Gonella-Diaza, G. Holguín, D. Montaña, D. Valbuena

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The objective of this study was to assess the association between CL diameter, embryo developmental status and recipient pregnancy rate after in vitro-produced embryo transfer. Data from a total of 17,521 embryo transfers from a commercial program were analyzed. The information was organized in pivot tables and the frequency of variables was determined with contingency tables. Additionally, a logistic regression analysis was performed to determine the odds ratio and the degree of association between the variables. Higher pregnancy rates were achieved when the CL was larger than 24 mm (39.7%) and 22 mm (33.7%) in diameter, whereas lower pregnancy rates were associated with a CL of 14 mm (24.2%). Moreover, pregnancy rate was 30.5% when the recipients had a CL greater than 20 mm in diameter, whereas pregnancy rate was 32.0% with a CL smaller than 20 mm (P ˂ 0.01). Furthermore, an association between high conception rates and CL diameter was found. With regard to embryo developmental status, higher pregnancy rates were associated with expanded blastocyst (37.0%) and blastocyst (28.8%) transfer. Low pregnancy rates were achieved when morulae were transferred (15.4%). The present results suggest that variables such as CL diameter and embryo developmental status are significantly important and must be considered for the success of an in vitro-produced bovine embryo transfer program.


corpus luteum diameter, embryo developmental stage, in vitro embryo production
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