cattle, next pigs and last of all sheep. 
The data collected in the Ukrainian SSR compared very favor- 
ably with the data obtained in the Belorussian SSR, where during 
the foot and mouth epizootic, 65.2% of mature cattle had developed 
this disease, 33.9% pigs had been attached and only 0.9% sheep had 
contracted foot and mouth disease, from among the total number of 
animals attacked by the epizootic. 
Age-wise, it was found that animals of all ages were equally 
susceptible to this disease, caused by the Ado virus, but the young 
and new born stock, were specially susceptible. 
SEASONS MOST FAVORABLE FOR THE SPREAD OF FOOT AND MOUTH 
DISEASE. 
The most favorable period for the propagation of foot and 
mouth disease in animals, has been observed to be the sutumn-winter 
months, this was evident by the commencement and immediate spread- 
ing of the foot and mouth epizootic in 1965. In the Khmel'nic'kij 
region, the foot and mouth epizootic had reached its peak in the 
spring (March-May) and Autumn (September-November) 1966-1967, 
According to the testimony of S.G, Poplaukhin (1968), the 
foot and mouth epizootic in the Altai Territory during 1949-1952 
and again from 1955 to 1956 had reached its highest peak in the 
winter months. The same theory, that foot and mouth disease is 
more rampant in the winter and autumn periods of the year, has been 
observed by S. Sh. Shaltikov (1961). N. N. Gizitdinov (1961), I.0. 
Dmitrov (1961) and S. K. V'yatkin (1961). 
V. I. Kindyakov (1970) states, that the epizootic flare-ups 
of foot and mouth disease in KAZAKHISTAN, in 77% of cases out of 
the total number occurred during the sutumn-winter periods of the 
year, after massive cattle drives. 
In our opinion, the substantial propagation of foot and mouth 
disease in the Ukraine during the autumn-winter months may be 
explained by the fairly high stability of Ano virus in lower tem- 
peratures and the various means by which foot and mouth infection 
_@an be spread. In particular, the latter was assisted by large 
fiovement of people and transport, in the autumn for preparation 
and transportation of farm products, animal drives by Sovkhoses 
and Kolkhoses ( State and Collective farms in USSR ) to the meat- 
packing plants, stables for feeding and "Zagotskot"--( "State 
purchase") and in the spring period ( this is for the Khmel'nic’ 
kig region ), it is also probably the result of field operations. 
And finally, insufficiently effective protective measures to 
combat the foot and mouth infection ( organization, quarantine- 
limits, veterinary attention, immunization of animals, etc. ) 
have also had their influence on the spreading of the foot and 
touth disease. During the summer months, the virus is very much 
(2) 
