Genetic analysis of persistency in HF crossbred cattle at an organized farm of northern India |
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| Authors: | Nisha Sharma Raman Narang Neeraj Kashyap Soni Kumari Simarjeet Kaur Poonam Ratwan |
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| Affiliation: | 1.Animal Genetics and Breeding Division,ICAR-National Dairy Research Institute,Karnal,India;2.Animal Genetics and Breeding Division,Guru Angad Dev Veterinary and Animal Sciences University,Ludhiana,India;3.Department of Animal Genetics and Breeding,Guru Angad Dev Veterinary and Animal Sciences University,Ludhiana,India;4.Animal Genetics Division,Indian Veterinary Research Institute,Izatnagar,India |
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| Abstract: | The present study was undertaken to estimate effect of various genetic and non-genetic factors on persistency of milk production and to identify the most appropriate persistency method that fits best in our environment. In the present study, effects of different non-genetic factors, viz. year, season, days to attain peak yield, and genetic group based on the level of exotic inheritance on persistency of milk yield in crossbred cattle were studied. Data comprised of 686 first lactation daily milk yield records of crossbred cattle that were maintained at GADVASU dairy farm over a period of 25 years from 1991 to 2015 were utilized to calculate persistency coefficients by four methods, viz., Ludwick and Peterson method (P1), Mahadevan method (P2), ratio method (P3), and Prasad et al. method (P4). Overall least squares means for persistency by Ludwick and Peterson method (P1), Mahadevan method (P2), ratio method (P3), and Prasad et al. method (P4) were 0.896?±?0.096, 1.385?±?0.224, 187.207?±?26.398, and 0.621?±?0.098, respectively. Effect of sires was significant (P?P?P?
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