138 



RADIOISOTOPES IN BIOLOGY AND AGRICULTURE 



animal. This may result in some splattering of urine, which, however, 

 has not been found serious. 



Swine. Swine present a more difficult problem than the animals dis- 

 cussed so far in that they cannot be held in place by means of a stanchion. 

 This difficulty was overcome by the use of a swine metabolism stall which 



Fig. 4-16. Method for occasional collection of samples of urine from male and female 

 swine requiring no restraint of the animal. The rubber tubing is sealed at the end. 

 {Courtesy of L. K. Bustad, Bioloi/y Section, Radiological Sciences Department, General 

 Electric Company, from work performed ttnder AEC Contract ir-31-109-£'n^-52.) 



was too narrow to permit the animal to turn around and in which an elec- 

 trically charged wire was employed to keep the animal in the proper posi- 

 tion. The hog soon learns how to avoid contact with the charged wire 

 and becomes reasonably comfortable and perhaps even mentally at rest 

 in the unit. A schematic diagram is presented in Fig. 4-14 (17). The 

 unit as described will accommodate animals from about 100 to 350 lb. 



