GENETIC ANALYSIS OF PRODUCTION AND REPRODUCTION TRAITS OF TRIPLE CROSS (HF 25% X J 25% X KANKREJ 50%) CATTLE ON AN ORGANIZED FARM
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Date
2006
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Anand Agricultural University, Anand
Abstract
Present study was undertaken for genetic analysis of production and
reproduction trits of HJK triple cross (HF 25% x J 25% x Kankrej 50%) maintained at
Livestock Research Station, AAU, Anand, Gujarat from 1990 to 2005. The study
included analysis of 572 lactation records of 223 HJK triple cross cows of three
generations belonging to 36 sires. Data were scrutinized for abnormality and finally
266 lactation records of 126 cow progenies of 21 sires having complete set of all
necessary records were used for genetic analysis. Various traits like Calf weight
(CW), Weight at first calving (WFC), Age at first calving (AFC), Service period (SP),
Calving interval (CI), Breeding efficiency (BE), Lactation length (LL), Dry period
(DP), Lactation milk yield (LY), Standard lactation milk yield (SLMY), Lifetime total
lactation days (LTTLD), Lifetime total milk yield (LTTMY), Average milk production
per day of lactation length (MY/LL), Average milk production per day of calving
interval (MY/CI), Average milk production per day of lifetime milking days
(MY/PL), Average milk production per day of lifetime calving intervals (MY/HL),
Peak yield (PY), Days to attain peak milk yield (DAPMY), Persistency of lactation,
Milk production efficiency per kg of WFC (MPEK), Milk production efficiency per
kg of WFC and lactation days (MPEKD), genetic and non-genetic factors affecting
the traits, lactation curve dynamics and path analysis have been studied.