High Producing Dairy Cow Diet Supplemented With Different Levels Of Fat Effect

The experiment was conducted to study the effects of different levels of additive fat in early lactation and cows were fed northeast hay and corn silage as roughage. Two factors and four levels were used in experimental design, 21 cows were chosen according to ages , parity Jactation period ,milk production and BW. They were random divided into 7 groups of 3. Group A was basic . Group B: the corn oil was added at 1 % of DM of diet. Group C: the corn oil was added at 2.5% of DM of diet. Group D: the corn oil was added at 4% of DM of diet. Group BI : the soy phosphatide was added at 1% of DM of diet. Group C1: the soy phosphatide was added at 2.5% of DM of diet. Group D1: the soy phosphatide was added at 4% of DM of diet .There were three parts in this experiment .The first was feeding experiment, recording weight ,estrus time after DMI ,milk yield and milk fat percentage .The second was digestive trail, measuring all kinds of nutrients in the diets and faeces and working out respective digestibility .The third was colleted the blood sample and and was measured the EE and cholesterol in the blood. The SPSS statistical analysis software was used in the experiment-Results:The milk yield of groups C, B1 and C1 were higher than those of groups A , D and D1 (P<0.01).Group d was more significant than group B (P<0.05).At the same time ,groupsC1 and D1 were more significant than group D in milk fat percentage .About the DIM ,ADG and diestrus ,group B was more significant thanD1 group(P<0.05).But other groups were more early than control group from calfing to estrus. (P<0.05).In the digestibility of diet nutrition ,groups B1 and B were more significant than groups A ,D1 and D . (P<0.05).Digestibility of CP was similar . (P>0.05).In the digestibility of NDF, groups A ,B1 and d were significant than group D. At thesame time ,in the digestibility of ADF ,group A was more significant than group D (P<0.05).But in the digestibility of CF ,B ,B1 and C1 groups were more significant than groups D and D1 .According to digestibility of Ca, group A was more significant than groups D and D1 (P<0.05),but in the digestibility of P ,every group was similar (P>0.05).Group A was more significant than groups C, D1 and D in EE of blood (P<0,01).At the same time group D1 was more significant than groups B1 ,B and A . (P<0,01).In the cholesterol, groups A and B were more significant than groups D and D1 groups (P<0.01),while group D1 was more significant than other groups . Conclusion:Trial diet added at 2.5% of DM in the form of soy phosphatide , using northeast hay and corn silage as roughage. It was more important to raise milk yield and improve health condition and fertility . But milk fat percentage was not reduced. The experiment found a new feed additives for dairy cattle and got more economical benefit with lower production cost.