Effect Of Hyprofat And Alfalfa On Dairy Cows Under Heat-Stressed Condition Or With Low Quality Roughages

This paper studied the effect of hyprofat and alfalfa on cattles under heat-sressed condition or with low quality roughages ,the mechanisms were also initially concerned.In experiment I,48 Holstein dairy cows were randomly divided intoGroupⅠ (controlgroup),Ⅱ,ⅢandⅣ, according to their parturition numbers, milk yield and lactation period. The test lasted 50 days, during which GroupⅡwas added with 400g hyprofat, GroupⅢwas supplemented 2.5kg alfalfa hay ,400g hyprofat and 2.5kg alfalfa hay were added to groupⅣat the same time, while there was nothing addition in the control concentrate. The results showed:(1) feeding hyprofat and alfalfa hay could lessen the decline tendency of milk yield which were raised respectively by 12.6%,14.08%,26.31%(p﹤0.01) compared with the control.(2) The milkfat percentage of GroupⅡ,ⅢandⅣwere raised respectively by 4.91%,15.34%, 14.11% compared with the control. Lactoprotein, SNF and density had little change.(3) T3 levels of the serum of GroupⅡ,ⅢandⅣwere all increased by 7.56%,13.95%and 19.19%(p﹤0.05)compared with the control. The change of T4 level of the serum was same to which of T3. T4 levels of the serum of GroupⅡ,ⅢandⅣwere all raised by 14.49%,14.5%and 27.39%(p﹤0.05)compared with the control. COR level of the serum of GroupⅡ,ⅢandⅣ was decreased by 6.06%,17.54%and 10.37% compared with the control. PRL level of the serum of GroupⅡ,ⅢandⅣ was raised by8.55%,5.02% and 20.58% compared with the control.(4)Milk yield of GroupⅡ,ⅢandⅣ was increased respectively by 2.06kg/head/day,2.3 kg/head/day and 4.3 kg/head/day.In a year(305 days)the milk yield would be raised 628.3kg,701.5kg and 1311.5kg.The added profit would be 397.85yuan,442.3yuan and 747.25yuan.GroupⅣcould achieve the greatest profit.In experiment II,10 Holstein dairy cows which parturition numbers was from 1 to 3 were randomly divided into Group I(control group), Group II according to their parturition numbers, milk yield and lactation period. The test lasted 60 days.The two groups had the same concentrate.The roughage of control group was composed of soybean straw,corn straw and peanut vine,while that of Group II was made of alfalfa silage. The results showed:(1)The alfalfa silage group increased the DMI by 16.67% compared with the control. There was significant difference between them( p﹤0.01).(2)The milk yield was significantly raised by feeding alfalfa silage (p﹤0.01).(3)The milkfat percentage was significantly raised by feeding alfalfa silage (p﹤0.05).There was little change in lactoprotein, SNF and density.(4)Alfalfa silage could achieved great profit. In a year(305 days)the milk yield of a cow fed with alfalfa silage would be raised by 2516kg,the added profit would be 1945.9yuan. In experiment III,10 and 4 Holstein dairy cattles which were in early lactation were respectively chosen from two farmers.The 14 Holstein dairy cows were randomly divided into Group I(control group), Group II according to their parturition numbers, milk yield. Group II was supplemented 300g hyprofat while there was no addition in the control group. The test lasted 50 days. The results showed:(1) DMI of Group II was significantly increased by 7.17%( p﹤0.01).(2) The milk yield of Group II was raised by 9.69%( p﹤0.01).(3) The milkfat percentage Group II was raised by 0.19%( p﹤0.05).The lactoprotein decreased by 0.02% compared with the control group ,and SNF,milk density had little change.(4)The level of GLU and HBDH of the serum were respectively decreased by 6.03%,13.05% by hyprofat as compared with the control group. The level of BUN of the serum was increased by 4.08%.There was no significantiy difference between the two groups.(5) The milk yield of the hyorofat group could be raised by 2.23kg/head/day.In one year(305 days),there would be added 813.9kg/head,and the added profit would be 411.75yuan.