Sentence:  The number of souls in this kingdom being usually reckoned one million and a half, of these I calculate there may be about two hundred thousand couple whose wives are <WSD>breeders</WSD>; from which number I subtract thirty thousand couples who are able to maintain their own children, although I apprehend there cannot be so many, under the present distresses of the kingdom; but this being granted, there will remain an hundred and seventy thousand <WSD>breeders</WSD>. 
Meaning of the word marked with <WSD> tags:  A person who has had or who is capable of having children; a person who is focussed on the rearing of their own children.