Perhaps you should try some spelling variations:
depressed litter » depressed mother (Expand search), depressed mothers (Expand search), depressed left (Expand search)
during depressed » during depressive (Expand search), during repressive (Expand search), feeling depressed (Expand search)
decrease during » increase during (Expand search), increases during (Expand search), increased during (Expand search)
litter decrease » faster decrease (Expand search), life decrease (Expand search)
in processing » grain processing (Expand search), in process (Expand search), in processed (Expand search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease OR decrease in processing ) OR ( decrease during depressed litter decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease OR decrease in processing ) OR ( decrease during depressed litter decrease ))*.