3319
At onset of first post - weaning estrus , sows received either an intravulval injection of 3 . 75 mg of prostaglandin analogue ( PGF ) or , served as a non - injected control ( CON ) .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None