Impact of additive direct and maternal heritability on production efficiency traits in Jersey crossbred cattle

POONAM RATWAN; MANOJ KUMAR; ANSHUMAN KUMAR; A K CHAKRAVARTY; AJOY MANDAL

doi:10.56093/ijans.v88i7.81480

Authors

POONAM RATWAN Ph.D. Scholar, Animal Genetics and Breeding Division, ICAR-National Dairy Research Institure, Karnal
MANOJ KUMAR Assistant Professor, Animal Genetics and Breeding Division, LUVAS, Hisar, Haryana, India.
ANSHUMAN KUMAR Ph.D. Scholar, Animal Genetics and Breeding Division, ICAR-National Dairy Research Institure, Karnal
A K CHAKRAVARTY Principal Scientist and Head, Animal Genetics and Breeding Division, ICAR-National Dairy Research Institure, Karnal, Haryana, India.
AJOY MANDAL Principal Scientist, Animal Genetics and Breeding Division, Eastern Regional Station, ICAR-National Dairy Research Institute, Kalyani, Nadia, West Bengal 741 235 India

https://doi.org/10.56093/ijans.v88i7.81480

Keywords:

Heritability, Jersey crossbred, Maternal effects, Milk production efficiency traits

Abstract

Variance components, direct and maternal heritability were estimated for milk production efficiency traits namely, milk yield per day of lactation length (MY/LL) and milk yield per day of calving interval (MY/CI) in Jersey crossbreds maintained at Eastern Regional Station of ICAR-National Dairy Research Institute, West Bengal (India). Data analyses were done using restricted maximum likelihood (REML) method with six alternative animal models (direct and including or excluding maternal associated effects). The best model was chosen after testing the improvement of the log-likelihood values and it revealed direct heritability estimates as 0.47 and 0.25 for MY/LL and MY/CI traits, respectively. Maternal heritability (0.14) was found to be important for MY/LL trait and permanent environmental maternal effect contributed 12% to the total phenotypic variance of the MY/CI. Direct heritability estimates were high (0.47) for MY/LL and moderate for MY/CI (0.25) trait suggesting that there is ample scope of improvement through selection for milk production efficiency traits in Jersey crossbred maintained at organized
herds.

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