Study On Seasonal Variation Characteristics Of Milk Yield And RAW Milk Composition In Liangcheng County,Wulanchabu City

This study analyzes the milk yield and compositi on of Holstein dairy cows from 2012 t o 2017 in the Haigao ani mal husbandr y of Liangcheng County,Wulancha bu City,and discusses the seasonal variation of milk production and milk composition of Holstein dairy cows in this area.To provide a scientific basis for the i mprovement of the feed nutrient regulation ability of pasture and the e ffe ctive and reasonable supply of raw milk.The results show:1.Milk production increased significantly from lat e February,reaching the highest level of milk production in June and July,or an increase of 8%.The di ffer ence was significant at P< 0.05;it began to decline at the e nd o f Septe mber and reached milk production in Nove mber a nd Dece mbe r.The a mount wa s the lowe st with a decrease of 7%,with a significant differenc e of P<0.05.2.The trend of seasonal changes in milk fat percentage,milk protein rate,and milk e nergy are opposite t o the seas onal changes in milk production,that is,they ha ve droppe d significa ntly since January of each year and reache d the lowest mil k composition in July,a drop of 10%.%;Since August,it has risen significantly,reaching the highest level of milk in December,an increase of 11%.3.There is no significant difference in the production of various component s of milk in each month of each year,which is related to the concentration effect.4.Milk pr oduction i s related to changes in energy and te mperature per kilogra m of milk,a nd it is more likely to affect milk production and energy per kilogra m of milk when winter temper atures drop.5.Milk yield,4% standard mi lk,and energy calibration standards The overall milk production changes with se asonal trends are ba sically the sa me,but the change in milk production is greater than 4%.Standard Milk and Energy Ca libration Standard Milk produc tion.The magnitude of change.