Association of plasma 5'-nucleotidase and alkaline phosphatase with production traits in chickens: genetic and phenotypic variability.

Heritability of plasma alkaline phosphatase and 5'-nucleotidase enzyme activities at 20, 35 and 50 weeks of age ranged from 0.047 to 0.275.

Association of plasma 5'-nucleotidase and alkaline phosphatase with production traits in chickens: effects of age and housing systems.

The housing system, age of pullets and their interaction had a significant effect on plasma 5'-nucleotidase and alkaline phosphatase activities. Activities were higher in birds in cages than in those on the floor, reflecting perhaps the stress of caging. Activities increased with age.

Relationship of serum guanase levels with economic characters in Zebu purebred and temperate x Zebu crossbred dairy cattle.

Serum guanase levels of Indian Zebu (Hariana) cattle and its crosses with different exotic levels of temperate breeds of dairy cattle were estimated in 527 animals, and their associations with economic characters were determined. The overall mean value of serum guanase level was 13.46 +/- 0.