Sentence:  The information given when the first animal was presented for slaughter was that lead paint had been consumed and that three other animals of the same herd had died and had been sent to a <WSD>knackers yard</WSD>.sic 
Meaning of the word marked with <WSD> tags:  The area of a slaughterhouse where carcasses unfit for human consumption or other purposes are rendered down to produce useful materials such as glue.