. Activities handbook. Veterinary medicine. organic phosphate systemic insecticides. The latter have been used extensively in field trials during the past few years with encouraging results. The future The National Cattle Grub Committee reports as follows: "Research in grub control now un- derway and recommended includes a study of the ecology and life cycle of the parasite in various regions, effects of movement of cattle from one climate to another on the life cycle of grubs, the apparent resistance of older cat- tle to grubs, and the possibility of induced im- munity to ; Th
. Activities handbook. Veterinary medicine. organic phosphate systemic insecticides. The latter have been used extensively in field trials during the past few years with encouraging results. The future The National Cattle Grub Committee reports as follows: "Research in grub control now un- derway and recommended includes a study of the ecology and life cycle of the parasite in various regions, effects of movement of cattle from one climate to another on the life cycle of grubs, the apparent resistance of older cat- tle to grubs, and the possibility of induced im- munity to ; The Animal Disease Eradication Division does not envision a national cattle grub eradi- cation program in the immediate future. How- ever, available reports on each new develop- ment in research and field trials are constantly examined and analyzed in light of possible ap- plication to cattle grub eradication. HOG CHOLERA The cholera chronicle Hog cholera is reported to have been in this country since the early 1830's. Some reports indicate that it was here before then. During the latter part of the 19th century it devastated the swine population of the country. As late as 1913 an epidemic of this was responsi- ble for killing 10 percent of the hogs in the United States. After much trial and error, research scien- tists of the former Bureau of Animal identified a virus as the cause of hog cholera. Following this, vaccination with live hog chol- era virus and serum was started. This type of immunization saved the swine of the country. Periodic outbreaks, however, con- tinued to occur. Investigations revealed that they were due to no vaccination or. in some cases, were directly attributable to the virulent virus used in the immunization. HOG CHOLERA REPORTED Fiscal Year 1960. PUERTO RICO U S DEPARTMENT OF AGfitCUlTuBf ?^EG 60 (n> S057 AGBICUIIUBAI SESEAHtCM SfBviCE 32. Please note that these images are extracted from scanned page images that may have
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