7745

7210

كارشناسي ارشد

علوم دامي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1391

دوازده،75ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

غلامرضا قرباني، مسعود عليخاني

محمد خوروش، سعيد انصاري

1/3/92

جمشيد رزمجو، اميرحسين مهدوي

مهندسي كشاورزي

ID7210

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Investigation of contrast effects of alfalfa particle size and fat source on performance of dairy cows Mahdi Saebi Far Yamahdi110121@hotmail com Date of submission january 2013 Department of animal science Isfahan University of technology isfahan 84156 83111 iran Degree M Sc Language Farsi 1 Gholam Reza Ghorbani Professor supervisor 2 Masoud Alikhani Associate Professor supervisor Abstract This study was conducted to determine the effects between alfalfa particle size PS with two unsaturated fat source on dairy cows Eight mid lactation cows DIM 132 12 with average milk yield 37 6 were selected A replicated 4 4 Latin square design with 2 2 factorial arangment of treatments was used to determining the single and contrast effects of treatments on production and chewing activity Rations was based on different alfalfa PS and oil sources including 1 TMR made of 2 mm alfalfa and soy oil 2 TMR made of 5 mm alfalfa and soy oil 3 TMR made of 2 mm alfalfa and yellow grease and 4 TMR made of 5 mm alfalfa and yellow grease Treatments including soy oil consumed more feed P 0 05 than those had included yellow grease because of its palatability and lower hipophagic effects of soy oil Crude protein digestibility was higher for alfalfa with short PS that probably P 0 05 Digestion of NDF and ADF was effected by fat sources as treatments of soy oil had lower digestion for fiber P 0 05 Particle size of alfalfa hay did not affect milk production but fat production tended to be higher for short PS P 0 15 and fat protein P 0 15 tended to be significantly for lower PS Eating and ruminating time did not differ between treatments but total chewing time and for treatment with long particle size was higher P 0 05 Ratio of chewing time to DMI neutral detergent fiber acid detergent fiber and physically effective NDF was significantly higher for lower PS P 0 05 Two hours after feeding rumen fluid pH did not have diference between treatments but in 4th hours after feeding yellow grease had a significantly higher pH in rumen P 0 05 Result of this study showed that yellow grease did not have adverse effects on performance and can be replaced with soy oil in dairy cows ration Keywords dairy cow particle size soy oil yellow grease

غلامرضا قرباني، مسعود عليخاني

محمد خوروش، سعيد انصاري

جمشيد رزمجو، اميرحسين مهدوي