200 CONTAGIOUS DISEASES. 



of, they become immune, and the disease dies out in from two 

 to four years, as it gradually loses its virulence, ajipears at a 

 later period of gestation, and attacks fewer animals. 



The best and cheapest method of disinfection is to thoroughly 

 cleanse the byres by washing and scrubbing, and then brush 

 them over with a hot 1 per cent, solution of chloride of lime. 

 Everything should be thoroughly cleansed twice a year, the 

 stalls, walls, and floors once a week, and the drains daily 

 rinsed with the chloride of lime solution. Animals showing 

 signs of abortion should be at onco isolated and provided with 

 separate attendants. 



When the fcetal membranes are retained more than twelve 

 hours they should, as far as possible, be removed by hand, and, 

 together with the dead foetus, destroyed by fire or buried in 

 quicklime. The uterus should be washed out with 1 per cent, 

 creoline, or 5 per cent, lysol solution, and this should be con- 

 tinued weekly or oftener as along as vaginal discharges continue 

 (usually two or three months after calving), and the cows not 

 put to bull until their entire discontinuance. This both pre- 

 vents the spread of the disease, and allows the majority of the 

 animals to become pregnant. 



In the apparently healthy cows and calves the vagina should 

 be carefully washed out before they are allowed to enter the 

 cow-shed, and afterwards the vulva, tail, and surrounding parts 

 washed daily with the same solution, and the sheaths of infected 

 bulls should be similarly washed out. 



Or Nocard's recommendations may be substituted. They are 

 as follows : — 



(1.) The floors, &c. are scraped, thoroughly cleansed, and 

 sprinkled with a solution of sulphate of copper. 



(2.) Each week from the date of conception the vaginas should 

 be thoroughly injected by means of a large syringe with the 

 following tepid solution : — 



Distilled water, Twenty quarts. 



36 per cent, alcohol and glycerine, aa. 3 ounces, ^iii. 

 Bichloride mercury, 2| drams, . . 3ii-ss. 



The vulva, anus, and surrounding parts of all the pregnant 

 cows should be carefully sponged with the same solution. 



After removal of the foetal membranes of an aborted cow, the 



