Greeley-based Pilgrim's Pride Corp. has put up a $50,000 reward for information leading to the arrest and conviction of vandals who have killed about 300,000 chickens being raised by contract growers in South Carolina. According to reports by The State newspaper in Columbia, S.C., vandals raised the temperature in chicken houses as high as 115 degrees on 16 family farms in Clarendon County, S.C., over the past two weeks killing chickens and costing owners roughly $1.7 million.