Abstract
The objective of the present study was to study the effect of mastitis on milk yield in dairy cows by accounting the correlations among repeated records on monthly milk yield. The data were collected from monthly milk yield records of 482 dairy cows maintained at three Military Dairy Farms at Agra, Bareilly and Lucknow of Uttar Pradesh (India) for the period from 2011 to 2013. The overall prevalence of mastitis during study period was observed as 24.69%. Mixed modelling using four covariance structures (simple, compound symmetry, autoregressive and unstructured) was used to estimate effect of mastitis on milk yield by adjusting the effects of breed, mastitis, age, calving season, farm, month in lactation and random effects of each cow. On the basis of goodness fit criteria, unstructured covariance structure showed reliable results and estimated 36.76 kg losses due to mastitis in monthly milk yield in dairy cows.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
