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Iii (eding row.
Te-t and slaughter. the first •■mi1; plus the vaccination of all calves as they come on, test and - the —temporary_I'etcnTtrnrr of __ l_h e react■■ i s pills t ae vaccinat ion of female calves until there are suf!a cut replacements raised and \acemated in your own herd to take the place»<>f the-e reactors are vo can economically move them out o! until these react cos heroine n "11 pi of it aide, of rour-e 'rat i~ t" t and -laughter hut that is just spreadinir ovei a longer period of time, seems to he a very sat isfaetciry way. The third "tie, wdhout the test of the herd, • imply involves the vaccination < n regular basis of all the female calves which the man can m oduco until such time, shall we s»y—50', of tile producing herd represents animals that are or were vaccinated as calves at which time he should test to see WhoTe he stands and4 then adopt either one of the other two proceeding plans. \\'e are going up the scale all the time. We go from C to B to A or we go from B to A. And finally D. the adult vaccination. A man who has a clean herd or a recently infected herd where he has picked up an extra virulent severe strain, or family, of this organism and it is spreading through his whole herd very rapidly, may find some assistance in adult vaccination. In a great many instances it does stop the abortion rate and give the man a breather. If^ makes of course all of his animals reactors and yet production wise it does very frequently stop his abortions, slow up the storm, and put him in a position where he can draw a couple of breaths without losing too much and if he will then adopt calf vaccination he will eventually work into B or A
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