Milk Production Curves Obtained from Cows Raised in Türkiye According to Years and Determination of Production Differences with the Help of Cluster Analysis and Friedman Test

In the study, cluster analysis and Friedman tests were used to create curves for cow milk yields in Türkiye between 2010-2023 and to determine yield differences. For this purpose, milk yield records obtained from TUIK for the years in question were used. Since data before 2010 could not be accessed, 2010 was taken as the starting date. When the figures obtained in the study are examined, it is striking that the years generally show similar curves. These curves generally show a decrease from January to February, then an increase until May. Milk yield values, which reach their peak in May, decrease again until November. After this month, a new increase is noted in December. The months showing maximum and minimum values in the graphs of 2016 and 2017 are different. Therefore, different curves were obtained for these years compared to other years. When the curves of all years, cluster analysis and Friedman test results are examined in general, it can be said that the highest production was determined in May and the lowest production in November. The reason for these differences should be investigated for the years 2016 and 2017, when different curve results were obtained. The findings of this study are important in terms of providing preliminary information for those who will conduct model studies on milk production in our country. In addition to the evaluation of curve graphs, it has been seen from the research findings that different statistical techniques such as cluster analysis and Friedman test give effective results in this type of data. Both cluster analysis and Friedman test methods are test methods that can be used safely in new studies where curve graphs will be made.