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sonably certain, however, that where failure has followed its 

 use, it was because the serum was improperly prepared 

 or not skilfully administered. Various experiment stations 

 have found that there is a loss of only about ten per cent, 

 of the hogs treated in herds already infected, and of only 

 one or two per cent, in well herds where the serum treat- 

 ment has been carefully used. The manufacture of serum 

 by the state, or official inspection of its manufacture by pri- 

 vate plants, will make its use as a cholera preventive still 

 more effective. No one is justified in neglecting to treat his 

 herd with the serum when hog cholera threatens. 



TOPICS FOR INVESTIGATION 



1. Have you any hogs that do not seem to be thriving? 

 If so, can you judge what is the matter? Do they cough? 

 Do they lack appetite? Do they look rough coated, and 

 run down ? Is it likely that they have tuberculosis ? That 

 they have worms ? Have they the thumps ? 



2. Examine several hogs out of your herd for the pres- 

 ence of lice. Are your hogs ever treated for lice? Why 

 is it that lousy hogs never thrive well ? 



3. Compare all the different types of hog-houses used 

 in your neighborhood. How many are clean, light, well 

 ventilated, and have the windows so placed that the pens 

 receive the sunlight during the spring farrowing season? 



4. Discuss the value of the cholera serum as a pre- 

 ventive for hog cholera. How would you proceed to get 

 state and government help for the care of hogs if any of 

 them showed symptoms of hog cholera? What are some 

 of the symptoms ? 



5. Show how to keep a book account of a pen of pigs, 

 five in number, for a season of six months. The items 

 should include labor costs, feed and equipment. 



6. Show upon the map the relative standing of the 

 hog states of the Union. Has there been a falling off or 

 an increase in hog production during the last ten years? 

 Refer to the last census report of the United States De- 

 partment of Agriculture. 



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