Effect Of Different Dietary Energy Levels On The Production Performance And The Reproductive Performance Of First Calving Cows During Perinatal Period

The effect of different energy levels on the production performance and the reproductiveperformance within antenatal2weeks to postnatal6weeks were investigated in first calving, and tostudy feeding pattern of the basal diet supplemented with high-energy feed, to provide a scientific basisfor reasonably preparing the diet, optimized milk quality, improved dairy cattle feeding economicbenefits. Nine Healthy China Holsteins of first calving in late pregnancy period, date due calving andsimilar weights were selected, and were assigned randomly into three groups each with three heads,with straw of millet and whole corn silage, under the stable content of crude protein circumstances. Thecontrol group was China Dairy cow Raise Standard2004Diet.120%energy diet to be the high energygroup and110%energy diet to be the middle energy group, Call ANOVA of SAS statistics software insignificance test analyzed.The results showed that: at the production performance, the dry matter intakes decreased with1.46kg/（dP﹤0.05）、1.34kg/（dP﹤0.05）respectively in the high energy group and middle energy group,one week test. There were no significant difference on dry matter intakes（P﹥0.05）.each group6weeksafter the calving. With the increasing of energy level, the reduce of weight to be slow（P﹥0.05）. Therewere no significant difference in the average milking production and4%FCM(4%standard diary)（P﹥0.05）. At the first milking week, milk fat percentage was increased27.5%（P﹤0.05）in the high energygroup, and24.2%（P﹤0.05）in the middle energy group compared with the control group. For themiddle energy group was no significant difference.At the fifth milking week, milk fat percentage wasincreased35.2%（P﹤0.05）in the high energy group, and15.78%（P﹤0.05）in the middle energy groupcompared with the control group, For the middle energy group was increased16,8%（P﹤0.05）.At thesixth milking week, milk fat percentage was increased28.01%（P﹤0.05）in the high energy group, and7.49%（P﹤0.05）in the middle energy group compared with the control group, For the middle energygroup was increased19.09%（P﹤0.05）.At the fourth milking week, the lactoprotein percentagesincreased21.3%（P﹤0.05）in the high energy group, and6.3%（P﹤0.05）in middle energy groupcompared with the control group, For the middle energy group was increased14.1%（P﹤0.05）.At thefifth milking week, the lactoprotein percentages was increased17.5%（P﹤0.05）in the high energygroup, and2.38%（P﹤0.05）in middle energy group compared with the control group, For the middleenergy group was increased14.7%（P﹤0.05）.At the sixth milking week, the lactoprotein percentageswas increased13.4%（P﹤0.05）in the high energy group, and7.27%（P﹤0.05）in middle energy groupcompared with the control group, For the middle energy group was increased5.71%（P﹤0.05）.Theeconomic benefits increased2.14yuan/head/d in the high energy group, and1.83yuan/head/d inmiddle energy group.At the reproductive performance,The body condition within40days after calving was that themarks got in the high energy group and the middle energy group were0.1point（P﹥0.05) and0.13point（P﹥0.05）higher respectively compared with the control group. The main result of the averagedays of the first service after delivery was that the high energy group was the shortest（P﹥0.05）, and the following was the middle energy group（P﹥0.05）.In this test, The120%energy diet was the relatively suitable for first calving during perinatalperiod through economic benefits and various index.