Dr. D. N. RankPARINEETA KAKATI2018-01-092018-01-092016http://krishikosh.egranth.ac.in/handle/1/5810039121The data for the present investigation were obtained from the performance records of 1249 Frieswal cattle daughters of 71 sires maintained at three Military Farms viz. Guwahati, Dimapur and Bengdubi of Assam, Nagaland and West Bengal states respectively of Eastern Command. The data distributed over a period of 13 years from 2000-2012, were used to estimate least-squares means of three traits viz. lactation length (LL), 305-day milk yield (305-DY) and calving interval (CI). The age at first calving (AFC) was considered as covariable. Effect of farm, parity, type of calving, period of birth and season of birth were investigated on these three traits by least-squares (LS) method.enAnalysisThesis