IX. KKP^KCTS OF DKFICIENCY 



17<) 



(/. Ixvquirementx for UcproducHon 



The requirements for egg production are low. .V diet composed primarily 

 of polished rice and sardine meal and containing 0.12 mg. of PGA per 

 kilogram of diet In' microbiological assay was found by Taylor"'" to be 

 ade(iuatc for egg production. Further supplementation with 1.0 mg. of 

 PHA per kilogram yielded no increase in egg production although the 

 hat(hal)ility of fertile eggs was increased. These results are in agreement 

 with those of Schweigert d al.,-'^ who reported that egg production and 

 hatchability on a basal diet containing 0.42 mg. of VC\ per kilogram fde- 



FlG. 11. Normal turkey (left) and PG.\-doficipn1 turkey (right i, siiowinfj; symp- 

 toms of cervical paralysis. 



termined l)y microbiological assay) and composed primarily of corn and 

 casein were not impro\'ed by the addition of 2.0 mg. of PGA. This was ob- 

 ser\'ed with both turkeys and hens. The average PGA content of the eggs 

 l)efore and after supplementation of the hen diet was 0.12 and 0.21 y per 

 gram in the ca.se of the turkey and 0.099 and 0.133 7, respectively, in the 

 case of the chicken. For poults from hens adeciuately supplemented with 

 PG.V, 0.8 mg. of the \itamin per kilogram appeared to be adeciuate. Tiie 

 reciuirement was higher for poults from hens which recei\ed no supplemen- 

 tation. Thus, although 0.45 mg. of PGA per kilogram of diet (measured by 



*» I.. W. Taylor, J'onllri/ Sci. 26, 372 (1947). 



*' H. S. Schweigert, H. L. Clermau, I', li. I'e.irsoii, and K. M. Sherwood, ./. Xiilrilion 

 35, 89 (1948). 



