5867

5482

كارشناسي ارشد

علوم دامي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1389

نه،55ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

محمد خوروش، مسعود عليخاني

حميدرضا رحماني، مسيح ا... فروزمند

14/2/90

احمد رياسي، امير حسين گلي

مهندسي كشاورزي

ID5482

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Study of Immune Response and Production Performance of Transition Dairy Cows Fed Calcium Salt of Soybean Oil Mehdi Karimian Karimianmehdi1985@gmail com Date of Submission 2011 3 2 Department of Animal Science Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor M Khorvash khorvash@cc iut ac ir Abstract The objective of this study was to investigate the effect of feeding calcium salt of soybean oil at transition period of Holstein dairy cows Twenty four multiparous Holstein dairy cows 700 50 kg and 260 days in pregnant were used in a completely randomized design Treatment were 1 control cows that were not fed fat before and after calving 2 cows were fed fat just after calving 3 cows were fed just before calving and 4 cows were on fat before and after calving Cows in their respective treatments were received supplemental fat at 2 1 2 2 2 of DM at close up first 21 DIM and between 21 60 DIM respectively Also productive performance and immune function of cows were investigated at these periods At all periods diets were isocaloric and isonitrogenic Cows were fed as TMR ad libitum at two equal portions in the morning and evening meals Furthermore dry matter intake body weight changes milk production and milk composition and feed efficiency were studied Using two times on 30 and 40 DIM SRBC 10 shot the immune function of cows were investigated Ten days after each stimulation date blood samples were taken of jugular vein of stimulated cows to measure the antibody titer Also white blood cells lymphocytes neutrophils and monocytes counts were measured To study plasma lipid fractions blood samples were taken on the days 14 7 0 7 14 21 28 35 42 49 and 56 relative to calving All data were analyzed using the mixed model procedure of SAS SAS 9 1 Cow was the specified term for the random effect and covariance structure was modeled using an auto regressive structure Feeding the calcium salt of soybean oil reduced dry matter intake before and after calving but it was not changed in cows on fourth treatment Cows on the third treatment had the highest milk production among treatments P 0 0001 It may be attributed to the greater DMI in cows on it P 0 05 Milk composition was similar among treatments and did not affect by treatments Feed efficiency improved in cows fed supplemental fat P 0 01 Before calving there was no difference in plasma concentrations of triglycerides VLDL LDL HDL and cholesterol among treatments but after calving plasma concentrations of triglycerides and LDL cholesterol in second treatment was the highest among treatments P 0 07 and P 0 09 mmol l 1 respectively There was no difference among treatments after first SRBC injection but was highest in cows fed fourth treatment after second injection P 0 08 No difference was observed in white blood cells lymphocytes neutrophils and monocytes counts among treatments whereas cows fed the second treatment had the highest eosinophil count relative to other treatments P 0 05 Results of current experiment indicated that feeding fat after calving can improve productive performance but not immune function Also cows on fat supplements before and after calving had optimal level of production with the highest immune function Key words Linoleic Acid Dry Matter Intake Antibody Titer Sheep Red Blood Cells Feed Efficiency

محمد خوروش، مسعود عليخاني

حميدرضا رحماني، مسيح ا... فروزمند

احمد رياسي، امير حسين گلي