7. Never underestimate the weight of the hog. Better overestimate 

 the weight, as it is possible to give too little serum, but utterly impos- 

 sible to give too much. 



8. Tincture of iodine is universally recognized as the most efficient 

 skin disinfectant, hence it is recommended that the site of injection 

 be painted with tincture of iodine. Allow about one minute for drying 

 before injection is made. 



9. Carefully force all air out of the syringe before making the in- 

 jection, as air bubbles are calculated to cause abscesses. 



10. Serum should remain potent for at least six months if kept in 

 original sealed bottles in refrigerator. 



11. Destroy all unused bottles of serum which have been opened. 



13. The injection should be made behind the ear of large hogs, espe- 

 cially those which are to be slaughtered within four to six weeks after 

 vaccination. (See Fig. 33.) The site of injection is in the depression 

 behind the jaw, and slightly below and a little behind base of ear. This 

 location is recommended in preference to ham injection, on account 

 of possibility of abscesses following the injection. Another desirable 

 site for injection in large hogs is under the skin in axillary space — 

 depression between chest and elbow. (See Fig. 32.) 



14. Never mix serum and virus. Always inject them separately; 

 serum on one side and virus on the other. Use a special syringe for 

 each. 



15. Handle pregnant sows with care while vaccinating. The in- 

 jection of serum and virus will not cause abortion, but rough and 

 careless handling will cause it. 



16. After each injection is made immerse syringe in a clean basin 

 containing carbolic acid, one teaspoonful ; warm water, one-half gallon. 



17. Keep vaccinated hogs in a small lot for twenty-one days after 

 the operation, before they are allowed to mingle with unvaccinated hogs 

 or run at large on public roads, commons or ranges. 



18. \\ e recommend immunizing the whole herd, then immunize 

 each litter of pigs at or just before weaning time. This gives protection 

 against cholera at a very reasonable cost. Make it a practice to raise 

 only immune hogs, in which your investments in swine will be almost 

 as safe as U. S. Government bonds. Losses from this disease can be 

 entirely eliminated by maintaining a cholera-immune herd at all times. 



19. Pigs from immune sows are themselves immune while they are 

 subsisting alone on the mother's milk. As soon as they begin to eat 

 about the premises they become susceptible to the disease. 



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