Sentence:  Weanlings grow into feeder <WSD>pigs</WSD>, and feeder <WSD>pigs</WSD> grow into slaughter hogs. ... Ultimately the end use for virtually all <WSD>pigs</WSD> and hogs is to be slaughtered for the production of pork and other products. 
Meaning of the word marked with <WSD> tags:  A young swine, a piglet (contrasted with a hog, an adult swine).