PIGGERIES 201 



slightly above the level of the floor and may be lined with galvanised 

 sheet iron or zinc to prevent rotting. The trough may be soaked 

 thoroughly in petroleum to prevent the pigs chewing the wood. Every- 



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Fig. 157. 



thing must be very strong, and hardwood is to be preferred, at least for 

 the vertical posts. The construction will be clear from the figure. 



A second trough should be provided inside the yard for drinkin^ 



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^42" 



Fig. 153. 



purposes, so constructed as not to be easily upset. Good troughs of 

 reinforced concrete manufactured in this country can be obtained. 



Cost. — For reasons of cost, design No. 1 would be more likely to be 

 adopted than design No. 2. 



A piggery to design No. 1 would cost about £160 in the Transvaal and 



