Assessment of hormone status and its correlation with milk production during different stages of lactation in indigenous and crossbred cows

The study was undertaken to determine and compare the activity of important enzymes and its correlation with milk production in cattle. The study was done on each of six Gir, Kankrej and Crossbred cattle. The animals were divided in to three groups viz. 0-90 days of lactation (Group I), 91-180 days of lactation (group II) and 181 till dry stage (group III). Blood was collected aseptically before and after milking and clear plasma was separated and stored until analyzed.