21409
Groups of 10 male and female Sprague - Dawley rats were administered H . parviflora dried powder at doses of 0 , 100 , 250 , and 350mg / kg body weight / day by gavage for an 11 - week pre - mating period and a 14 - day co - habitation period , and for females , through lactation day 4 .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None