Results (
Thai) 1:
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Experimental designAfter in vitro maturation and fertilization, presumptive zygotes (n = 1,692) were randomly assigned into two groups: Control – zygotes (n = 815) cultured in 500 μL CR2aa medium (modified from Rosenkrans Jr and First [28]) supplemented only with 10% FCS and 3 mg/mL BSA fraction V; or CLA – zygotes (n = 877) cultured in the same conditions of the control group, but with additional supplementation of the culture medium with 100 μmol/L trans–10, cis–12 CLA (Matreya, LLC,Pleasant Gap, PA, USA) as described by Pereira et al. [17]. Unlike Pereira et al. [17], however, in the present study no additional antioxidants were used in the culture medium. On the 3rd day of culture (d 3) cleavage ratewas assessed. On d 5, samples of embryos at morula stage (n = 15/group) were fixed for analysis of lipidscontent. On d 7, another sample of Grade I and II embryos at blastocyst stage (3 pools of 10 embryos/group)were placed in Eppendorf tubes and stored at − 80°Cuntil RNA extraction. For both lipid content and geneexpression analysis, embryos were sampled from different batches, and the remaining d 7 and d 8 Grade I and II blastocysts from all batches underwent slow freezing for analysis of pos-thawing survival rate or were used as controls (93 and 49 from control group, and 103 and 44 from the CLA group, respectively). Blastocyst rate was assessed on d 8 considering all blastocysts produced in drops where embryos were not removed for lipidsนับ
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