6 day blastocysts from donor eggs. Could slow development be a sperm issue?

[Orangeflowers]

Hello all,

I've got the outcome on the number of blastocysts frozen with donor eggs in Prague and partner's sperm -

Fully-expanded blastocysts:

Day 5 4/AA

Day 6 4/AA

Day 6 4/AA

Hatching blastocyst

Day 6 5/AA

I am super grateful 🙏 and relieved that I have some in the freezer as only 5 fertilised from 12 collected, 9 mature. Also the grades look top.

However I'm slightly concerned they are mainly day 6, which I think statistically have slightly poorer outcomes.

I did have poor fertilisation and slow development with my own eggs, but did get my daughter from a day 6 blastocyst ❤️

I just presumed donor eggs would reach blastocyst by day 5 as my donor was 24 years old. I'm wondering if it could be down to a sperm issue? I always thought slow development was down to poor energy in older eggs and mitochondrial issues.

I am hoping to transfer one, but am worried it might not thaw ok and then it would be a wasted trip, or would they have chance to defrost another on the same or next day?

I will ask the clinic but they are slow at getting back.

Hope everyone is doing well on their journey's xx

[Nakijo]

Hi dear. I have a feeling this could be an issue with your hobby's sperm. Try finding out if its the one so you know what to do next and rid of the doubt you have now.

All the best