498 DISEASES OF CATTLE. 



on September 2 is moved to field No. 2A. The cattle are permitted 

 to remain 20 days on each of the fields designated 2 A, 2B, and 3. 

 At the end of this time (Nov. 1) all the ticks on the cattle have 

 dropped, and the herd is returned to field No. lA, which in the 

 meantime has become free of ticks. Later, if it is desired, the cattle 

 may be placed in field No. 4. They should not, however, be returned 

 to any of the other fields or driven across them, since these are in- 

 fested with ticks. Field No. IB will be free from ticks July 1 of the 

 following year, at which time the temporary double fence may be 

 removed and the cattle allowed to graze over the entire pasture. The 

 rest of the farm will be free of ticks by August 1. If found desirable, 

 the herd may be continued longer in field No. 3, even as late as Feb- 

 ruary 15, the only objection to this being that it will break the crop 

 rotation by preventing the sowing of oats in the fall. 



It is well, when practicable, to have double fences with an inter- 

 vening space of 15 feet between the different fields in order to pre- 

 vent the ticks getting from one field to another. If this is not pos- 

 sible on account of the expense and time required to build the extra 

 line of fence, the next Ijest thing is to throw up with a plow several 

 furrows on each side of the dividing fences. 



AMien there are streams running through the farm or the slope of 

 the land is considerable, so that ticks may be washed from one field 

 to the other during rains, the fields should be so arranged or selected 

 that the drainage is from field No. lA to No. IB, and from field No. 3 

 toward fields Nos. 2A and 2B. 



Plan reqtdring^ eight months. — The plan indicated in figure 2 is 

 begim fifteen days later than the preceding one and requires eight 

 months for its completion. The pasture is divided as before. The 

 herd is moved July 1 from field No. lA to No. IB, and on October 

 15 is moved from there to field No. 2. The herd may be continued 

 on fields Nos. 2 and 3 until February 15 in any way found most 

 convenient, since there is no danger of young ticks hatching during 

 that time. The herd is moved not later than February 15 to field 

 No. 4. All the ticks on the cattle will have dropped by December 

 20, consequently the herd may be moved to field No. 4 as early as 

 that date, if found desirable. 



By March 1 the original pasture is free and the cattle are returned 

 there. Field No. IB will be free of ticks by August 1, at which time 

 the double fence separating the two parts of the pasture may be 

 removed. The rest of the farm will not be certainly free of ticks 

 until September 1. The drainage in general should be from field No. 

 lA toward No. IB, and from field No. 4 toward field No. 2. 



Plan requiHTig four months^ with a new pasture. — The plan of rota- 

 tion represented in figure 3 involves changing the location of the 

 pasture. The oat field (field No. 4) after the grain has been har- 

 vested is reserved for this purpose. It should be sown in cowpeas, 



