Thus the contamination of some tissues may be increased if infected animals are slaughtered by penetrative brain stunning, or if the brain and/or spinal cord is sawed;
(the contamination of some tissues; may be increased; ) (infected animals; are slaughtered; by penetrative brain stunning) (the brain and/or spinal cord; is sawed; )
the contamination of some tissues infected animals the brain and/or spinal cord
may be increased are slaughtered is sawed
by penetrative brain stunning