STATISTICAL INVESTIGATIONS TO MILK YIELD DATA OF JERSEY AND HOLSTEIN FRIESIAN CROSS BREEDS
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Date
2019-04
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UHF,NAUNI
Abstract
ABSTRACT
The present investigation entitled “Statistical Investigations to Milk Yield Data of
Jersey and Holstein Friesian Cross Breeds” was carried out at the main campus dairy farm
of Dr Yashwant Singh Parmar University of Horticulture and Forestry, Nauni, Solan (HP).
Secondary data on milk yield for Jersey and Holstein Friesian crossbred cows for 37 years
from 1978-2014 were considered for the variability analysis. The data were subjected to
variability analysis in order to test the variability among seven lactations/different months.
Among seven lactations, maximum mean milk yield (litres) was observed at lactation 4 and
minimum in lactation 1 in both crossbred cows, whereas in different months milk yield of
Jersey crossbred cows, maximum monthly mean milk yield (litres) was observed in July
month and minimum in November month. The milk yield of Holstein Friesian crossbred
cows was maximum in November month and minimum in September month. Bartlett’s Chisquare
test for testing the heterogeneity of variances suggested that there were significant
variability among seven lactations/ different months with respect to monthly milk yield of
both crossbred cows. Wricke’s Ecovalence, Finlay & Wilkinson’s and Eberhart & Russell’s
models suggested that lactation 5 in Jersey crossbred cows and lactation 7 in Holstein
Friesian crossbred cows was found most stable lactation. Quadratic model was found best
fitted for prediction of monthly milk yield on the basis of high value of Adj. R2, low value of
RMSE and Theil’s inequality coefficient, while ARIMA (6, 0, 2) was the best fitted model
for prediction of monthly milk yield. Maximum seasonal index in monthly milk yield was
obtained in season 3 and minimum in season 1 for monthly variation and maximum seasonal
index in monthly milk yield was obtained in season 3 and minimum in season 1 with respect
to seasonal variation.
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