(Department of Animal Breeding and Genetics, College of Veterinary and Animal Sciences, Mannuthy, 1980) Girija, C R; KAU; Krishnan, Nair B R
With the objective of studying the peak yield, persistency, their relation with other production traits and the shape of the lactation curves, the data on the production and reproduction records of 298 Jersey x Zebu and 69 Brown Swiss x Zebu crossbred cows maintained at Livestock farms of Kerala Agricultural University were utilized. Persistency was calculated as a ratio of the yield from the attainment of peak yield to the 305 days yield and the yield upto the peak yield.
