Analysis Of Dynamic Data Of DHI And Blood Biochemical Indexes Of Different Lactation Days And Fetal Cows

This study selected two farms in a large-scale farming base in Nanping City,Fujian Province.Data were collected from a total of 43,403 lactating cows produced during the 29 months from March 2015 to July 2017 in the 29 months from March 2015 to July 2017 1042 dairy cattle pasture blood biochemical indicators of the test report.The effects of different parity,days of lactation and natural month on the DHI and blood biochemical indexes of dairy cows were analyzed.The results show:1.In different parity on the performance of lactating cattle results analysis,we can see that parity has a significant impact on daily output,and in the second parity in the daily output was significantly higher than the other groups;somatic cell number with the tire The number of somatic cells increased significantly on the 6th birth,and the number of somatic cells on the 6th parity was significantly higher than that of other groups.There was a significant linear positive or negative correlation between any of the milk components except for somatic cells and dry matter Relationship;Fetal times for the biochemical indicators of blood have a significant impact,including triiodothyronine and thyroxine content in the 6th parity was significantly lower than the other groups.2.The difference between most of the milk production during the natural month was significant,with a high value from January to February;the dry matter content was significantly higher in September and October,with an increasing trend;the change of somatic cell number The trend from high to low,reaching the highest in September;between the milk composition,in addition to protein content and the natural month,somatic cells and dry matter,the other two any significant difference between any two,indicating that any two There is a significant linear positive or negative correlation between.3,With the increase of lactation days,in addition to the daily output of fat,milk protein,lactose and somatic cells are there is an upward trend,with the increase in days of lactation,there is a downward trend in daily output;in the Among the milk components,except for somatic cells and dry matter,the differences between any two of the other two were significant,indicating that there was a significant linear positive or negative correlation between any two components...