Breadcrumbs makes the user to navigation more easily, and not for SEO. But for SEO Google suggested to add some attributes and tags to your existing code for make it done. Here is an example
Page: SEO
Sitemap guidelines
Sitemap index file must be UTF-8 encoded.
A single Sitemap file cannot list more than 50,000 URLs and must be no …
Creating and Submitting a sitemap (or site map) of your site.
The term Sitemap/site map is meant to help users or crawlers find the informations about your site.Simply ! in other …