28 



GUAM AUIUCULTUEAL EXPERIMENT STATION. 



infestation on Fannie, one of the station cows, which lost 1G7 pounds 

 in six months, is shown in Phite VI, figure 1. 



The pure-bred Ayrshire bull, Harry Gray, bred at the Guam 

 Experiment Station, was sent to Cotot for breeding purposes Decem- 

 ber 29, 1014, weighing at that time 715 pounds. As was noted in 

 the discussion of the Cotot stock farm, the pasture was as valuable 

 as could be obtained in Guam. The bull was allowed to run free in 



Fig. 2. — Temperature chart of John Gray. 



the pasture Avitli the cows until February 13, 1915. Although he 

 was infested with ticks from the start, it was not until that time 

 that the effect of tick infestation became especially serious (fig. 3). 

 When returned to the station on February 13 he weighed 570 poimds 

 and presented the typical symptoms later described in full (PI. YI, 

 %. 2). Through a complete riddance of all ticks, the administra- 

 tion of antifebrile agents, and intestinal antiseptics, together with 



Fig. o. — Temperature cliart of Harry Gray. 



proper feed and general good care, he has slowly regained in part 

 his normal condition, weighing 018 pounds on June 30, 1915. 



Several examinations of the blood of the Ayrshire cow during the 

 periods of high fever showed the presence of a protozoan. This 

 parasite is smaller than the Piropl-asma. Ugeminwn and is round, 

 oval, or rod-shaped. Usually but one protozoan is found in a blood 

 cell. Thus far the blood of native cattle has been found free from 

 the parasites. 



