Abstract:The data on age at first calving for 539 records of crossbred cows of differentfilial/genetic groups were considered for the present investigation. These crossbreds belonged to eightfilial/genetic groups (F1, F2, F3, F4, F5, F6, F7 and F8) maintained at Livestock Experiment StationQadirabad District Sahiwal from 1991 to 2014 (24 years). The duration of 24 year was divided into 6periods (P1, P2, P3, P4, P5 and P6) of four years each. Each year was further divided into threeseasons as winter (November-February),… Show more
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