10999
The percentage of stillborn kits per litter was significantly increased by dietary concentrations of 4 . 5 micro g sum PCBs / g feed ( 28 pg TEQWHO 2005 / g feed ) and greater .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None