Show pathologist TELLS OF VACCINE USE IN POULTRY FLOCKS it chicken pox has occurred on the premises of a poultry nian or on closely adjacent premises during tire tho past year it is wise to vaccinate all new additions to the flock whether young or mature stock advises dr D E madsen animal pathologist ot of the utah state agricultural college experiments show allow that there Is ii little if 1 any retardation of growth when birds are vaccinated vaccina ted before entering production says dr madsen vaccination while birds are in production however may cause a definite decrease in production and sometimes loss of a considerable number of birds the best age to vaccinate Is when the birds are between 50 and 90 days old the chicken produced vaccine should be used when non producing birds aro are immunized while the pigeon pro deuced vaccine Is probably the safest product to use q on birds which are laying care should be taken to use only a reliable product such as aa that dispensed by licensed veterinarians who according to the state law are the only persons persona authorized to administer live virus vaccines vaccine dr madson madsen warns in deciding to use the vaccine however it should be remembered says carl assistant extension that chickens cannot be immunized against a disease without actually giving them a mild case of the disease A live virus Is needed to produce immunity and some of the birds may become carriers once tl alie 1 e live virus viru 3 ha has S been brought onto the premises it may b be necessary to vaccinate a annually n thereafter |