Effect of mastitis on lactation curves in purebred Jersey cows

BARADA SHANKAR MOHANTY; MED RAM VERMA; VIJAY BAHADUR SHARMA; SAGARIKA MISHRA; VIJAY KUMAR PATIL

doi:10.56093/ijans.v88i7.81479

Authors

BARADA SHANKAR MOHANTY M.V.Sc. Scholar, Division of Livestock Economics, Statistics and Information Technology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh 243 122 India
MED RAM VERMA Principal Scientist, Division of Livestock Economics, Statistics and Information Technology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh 243 122 India
VIJAY BAHADUR SHARMA Ph.D. Scholar, Division of Livestock Economics, Statistics and Information Technology, Division of Livestock Economics, Statistics and Information Technology.
SAGARIKA MISHRA Assistant Project Officer, Orissa State Poultry Products Co-operative Marketing Federation Limited, Bhubaneswar, Odisha
VIJAY KUMAR PATIL Director, Central Cattle Breeding Farm, Sunabeda, Koraput, Odisha

https://doi.org/10.56093/ijans.v88i7.81479

Keywords:

Dairy cow, Jersey, Lactation curve, Mastitis, Purebred

Abstract

Mastitis is a most frequently occurring disease in dairy cattle which causes severe losses in milk production. In our study, we had collected 9960 weekly test day milk yield (WTDMY) records over a period of five years (2010– 2015) of 130 purebred Jersey cows reared at Central Cattle Breeding Farm, Sunabeda, Odisha under Ministry of Agriculture, Government of India. To study the lactation pattern of above milk data, we used six different lactation curve models, viz. Wilmink (WK), Wood (WD), Brody (BRD), Morant and Gnanasakthy (MG), Mitscherlich × Exponential (ME) and Ali and Schaeffer (AS). It was observed that in healthy and cows affected with mastitis, Ali and Schaeffer (AS) model showed best fit giving highest value of adjusted coefficient of determination (R² _adj.= 0.963) and lowest value of root mean square of error (0.303), Akaike’s information criterion (–97.887) and Schwartz Bayesian Information Criterion (–89.081). Testing of residuals was carried out by several tests, viz. the Shapiro- Wilk’s test, the run test and the Durbin-Watson (DW). Summary measures revealed that the loss of milk production due to mastitis with respect to healthy cows was 4.43%. Lactation persistency was estimated by ratio method and Mahadevan method. Higher persistency was observed in healthy cows.

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