Corpus luteum diameter and embryo developmental stage are associated with pregnancy rate: data analysis from 17, 521 embryo transfer s from a commercial in vitro bovine embryo production program
Gonella-Diaza, A MHolguin, GMontaña, DValbuena, D
The objective of th is 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 transfer s 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 o dds 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 rate s 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 morula e 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.(AU)
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