I guess the chicken will have evolved until it gaves birth in the (currently) most efficient way for it (with an egg). Therefore chicken = first. Disclaimer, I have neither read nor been told any of this. It just seems logical and might be bullish*t. I think that Rick F agrees and, clearly knows a lot more about this than I do.
Hi BigKev32. Sounds like you are local. We have a new club - Stockport Tri (sister club to Bramhall Runners) that might be of interest. There is training in one or other discipline almost every day. An internet search should locate our website