Vol. 10, Special Issue 12 (2021)

Author(s):
KB Savalia, AR Ahlawat, MD Odedra, AD Verma and HH Savsani

Abstract:
The present study was carried out using data of first lactation records of 513 Gir cows sired by 75 bulls spread over a period of 34 years (1981 to 2014), maintained at Cattle Breeding Farm, Junagadh Agricultural University, Junagadh. Analysis was carried out by least squares analysis method described by Harvey (1966) and Duncan’s new multiple range test as modified by Kramer. The overall least squares means for age at first calving (AFC) was 1558.63 ± 23.30 days. Season of birth had non-significant effect on AFC while period of birth had highly significant (P< 0.01) effect on AFC.