232 Influence of Ventilation on Milk Yield, [june, 



diseased animals, separation of the diseased animals from the 

 healthy animals, and the formation of a sound herd from 

 the healthy animals and the offspring of both are advocated. 

 Herds coming between these figures may be treated by either 

 method at the option of the owner, who should in any case 

 be allowed to reject either method and have his herd dealt 

 with by removal and slaughter of diseased animals. It is 

 recommended that the administrative authority, on becoming 

 aware of the existence of tuberculosis in a herd (to which a 

 policy of slaughter and compensation cannot reasonably be 

 applied), should require the owner to adopt one of the above 

 methods, according to the proportion of diseased animals. 

 If the owner objects his entire herd should be closely quaran- 

 tined and sales therefrom entirely prohibited. When 

 slaughter is necessary compensation is recommended, and the 

 utilisation, as far as possible, of the meat of such animals as 

 may be found fit for food. 



Education and Legislation. — A knowledge on the part of 

 the farmer of the cause and character of the disease, and its 

 methods of dissemination, is necessary if the measures for 

 eradication are to confer the greatest possible benefit ; and 

 co-operation should be secured between veterinary surgeons, 

 live stock owners, legislators, and the general public. 



Legislation is advocated providing for the compulsory 

 notification by owners and veterinary surgeons of the existence 

 of tuberculosis in a herd. Legislation is especially required 

 to prevent the sale, distribution, or use of tuberculin by any 

 persons other than those acting with the full knowledge or 

 under the direction of official authorities. 



The usual practice in milk production is to keep up the 

 temperature of cow-houses in winter as much as possible. 



Warmth, however, is only secured by 

 Influence of the exc i us i on G f f res h air, the tempera- 

 Ventilation On , . .,,11 r J.-L. 



Milk Yield ture ^ ein §" raiseo - D Y tne neat from tne 



animals' bodies, with the result that the 

 air becomes much polluted. It has been recognised in recent 

 years that this system is likely to be injurious to the health 

 of the animals, and particularly as being conducive to tuber- 



