2-Title: Development of prediction models for assessment of length of productive life in Frieswal cattle
Authors: MM Chopade, RS Deshmukh, BN Ramteke, SD Ingole, VB Dongre and MP Sawane
Source: Ruminant Science (2021)-10(1):9-12
How to cite this manuscript: Chopade MM, Deshmukh RS, Ramteke BN, Ingole SD, Dongre VB and Sawane MP (2021). Development of prediction models for assessment of length of productive life in Frieswal cattle. Ruminant Science 10(1):9-12.
The present study was carried out on Frieswal cattle (Holstein Friesian × Sahiwal cattle) maintained at Military Dairy Farm, Pimpri, Pune, Maharashtra. The data from the year 1983 to 2019 spread over 36 years was utilized for research purpose. The length of productive life was predicted using the explanatory variables lactation length, dry period and inter-calving period. The data were normalized for all the variables under the study and the cows with abnormal records are removed from the study. Further, the prediction equations were developed for the lifetime traits like the length of productive life up to three lactations (LPL3), length of productive life up to five lactations (LPL5) and length of productive life up to seven lactations (LPL7). It was observed that amongst the five lactations the incorporation of cumulative lactation length instead of individual lactation length has increased the accuracy of prediction. The highest accuracy of prediction for the length of productive life till seven lactations was observed when the cumulative lactation length model (cumll3 and cumll5) viz. 376.13-0.09 cumll3 + 1.20 cumll5 were used with coefficient of determination value as 82.58% and RMSE as 0.61%.
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