Correlation Analysis of the Season, Parity, Lactation Period and Milk Yield and Milk Composition of Dairy Cow
Author(s): WEI Lin-lin, YANG Ji-ye, QIN Xue, YANG Zhong, YANG Lin, DU Guang-hua, GONG Rui-juan, YANG De-cheng
Pages: 10-14
Year: 2015 Issue: 19
Journal: China Dairy Cattle
Keyword: Holstein cow; Season; Parity; Lactation period; Milk yield; Milk composition; Correlation analysis;
Abstract: This study studied 5733 Holstein cows’ DHI measurement data during November 2013 to October 2014 (12 months) from a dairy farm located in YanBei, Shanxi to investigate the variation of milk yield and milk composition with the season, parity, lactation period. The SPSS software was used to analyze the inlfuence of the season, parity and lactation period on milk yield and milk composition, as well as the correlation between milk yield and other milk components. The results showed that season and lactation period had a signiifcant impact on milk yield, fat, protein, urea nitrogen, and somatic cell count. The parity significantly affect the milk yield and other dairy ingredients, except urea nitrogen. The study also showed that there was a signiifcant negative correlation between milk yield and fat, protein and somatic cell count, and a signiifcant positive correlation between milk yield and urea nitrogen. There was a signiifcantly negative correlation between milk fat percentage and protein percentage, somatic cell count and urea nitrogen; there was a signiifcant positive correlation between milk protein percentage and somatic cell count, and a negative correlation with urea nitrogen. There was a significant negative correlation between somatic cell count and urea nitrogen.
Pages: 10-14
Year: 2015 Issue: 19
Journal: China Dairy Cattle
Keyword: Holstein cow; Season; Parity; Lactation period; Milk yield; Milk composition; Correlation analysis;
Abstract: This study studied 5733 Holstein cows’ DHI measurement data during November 2013 to October 2014 (12 months) from a dairy farm located in YanBei, Shanxi to investigate the variation of milk yield and milk composition with the season, parity, lactation period. The SPSS software was used to analyze the inlfuence of the season, parity and lactation period on milk yield and milk composition, as well as the correlation between milk yield and other milk components. The results showed that season and lactation period had a signiifcant impact on milk yield, fat, protein, urea nitrogen, and somatic cell count. The parity significantly affect the milk yield and other dairy ingredients, except urea nitrogen. The study also showed that there was a signiifcant negative correlation between milk yield and fat, protein and somatic cell count, and a signiifcant positive correlation between milk yield and urea nitrogen. There was a signiifcantly negative correlation between milk fat percentage and protein percentage, somatic cell count and urea nitrogen; there was a signiifcant positive correlation between milk protein percentage and somatic cell count, and a negative correlation with urea nitrogen. There was a significant negative correlation between somatic cell count and urea nitrogen.
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