Perhaps you should try some spelling variations:
within progenies » sibling progenies (Expand search), in progenies (Expand search), their progenies (Expand search)
decrease litter » increased litter (Expand search), decrease after (Expand search), decreases liver (Expand search)
litter decrease » faster decrease (Expand search), life decrease (Expand search)
decrease within » decrease with (Expand search), decreases with (Expand search), disease within (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease the (Expand search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: (( decrease litter decrease within progenies ) OR ( decrease OR decrease to decrease ))~.