companied with considerable sneezing and snorting. Later the ani- 

 mal shakes its head or rubs its nose on the ground. As a rule it is 

 able to survive the attack until the escape of the larvae from the 

 head, and then the symptoms abate and the animal recovers." 39 



Few sheep die from grub in the head, but preventive measures 

 are desirable. One method is the smearing of the nostrils with some 

 substance that is offensive to the flies. Smearing the nose with pine 

 tar, or a mixture of tar and fish oil, will keep the flies away. The 

 application should be made at least once a week. One of the corn- 



Fig. 11 Sheep killed by dogs. Part of a flock of 192 head in Calhoun County, 

 Mich., killed in one night by the attack of two dogs. Few of these sheep 

 were bitten or maimed; they were simply run to death. (Photo by courtesy 

 of Breeder's Gazette.) 



mon methods of applying tar to the noses of the sheep is to smear 

 it on holes two and one-half inches in diameter in a board which 

 is placed over the salt trough. The flies are most troublesome during 

 June and July. Another preventive measure is, "to provide the sheep 

 with a cool, well-ventilated and darkened resting place in which they 

 may remain during the heat of the day in the warm season." 40 



i9 The Twenty-seventh Annual Report U. S. Bureau of Animal Industry, 

 Page 453. 



40 Shaw's "Management and Feeding of Sheep." 



33 



