CattleFax ■ Herd Fertility ■ SPRING 2010 see horn fly free Talk to your supplement provider, visit www.AltosidIGR.com or call 800-347-8272. ocs on horn y control all season and see a difference in your herd. It’s a fact; cattle that are bunched-up and stressed from the constant biting of horn ies are not graing and gaining as they should be. he ideal horn y control program starts with Altosid ® IGR in your feed supplement 30 days before y emergence to manage the ies that have overwintered in your pasture.