[Analysis of the cow milk productivity traits variation. Ph. D. thesis for obtaining of the Doctor degree in the sector of Agricultural sciences sub-sector of Animal breeding]
2007
Jonkus, D.
The promotional paper of Daina Jonkus Analysis of the Cow Milk Productivity Traits Variation was elaborated within 2001-2005 in Institute of Agrobiotechnology, Faculty of Agriculture of Latvian University of Agriculture, in Scientific Laboratory of Agronomical Analyses of the Latvia University of Agriculture, in Training and Research Farm Vecauce of the Latvia University of Agriculture and in the samples at Kurzeme artificial insemination station milk quality testing laboratory. The aim of the work to determine the variation of milk productivity traits and their affecting factors in the Latvian brown breed cows. To reach the aim the following tasks were put forward: to clarify the milk productivity end productivity traits fluctuations during pasture and indoor feeding periods; to evaluate the variation of the milk productivity traits during pasture and indoor feeding periods; to evaluate the repeatability of the cow milk productivity traits within a short period of time; to determine and evaluate the influence of separate physiological factors (lactation, lactation phase, daily average milk yield level, heating time) and environmental factors (feeding, air temperature, air humidity) on the milk productivity traits; to compare actual and recorded calculated milk productivity for precision assessment in breeding.
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