پديد آورنده :
اسماعيلي، مرتضي
عنوان :
بررسي وضعيت اندازه ذرات خوراك مصرفي گاوهاي شيري در گاوداري هاي استان اصفهان و تاثير آن بر فعاليت هاي متابوليكي، سلامت حيوان، توليد و تركيبات شير
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي
صفحه شمار :
يازده،49ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
محمد خوروش، غلامرضا قرباني
استاد مشاور :
سعيد انصاري مهياري، احمد رياسي
توصيفگر ها :
الياف موثر فيزيكي , گله هاي گاو شيري , توليد و درصد چربي شير
تاريخ نمايه سازي :
29/8/92
استاد داور :
مسعود عليخاني، علي نصيرپور
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Investigating the feed particle size of dairy cow in Isfahan dairy farms and its impact on metabolic activities animal health and milk production Morteza Esmaeili esmaeilim @gmail com Date of Submission Department of Animal Science Isfahan University of Technology Isfahan Iran Degree M Sc Language Farsi Supervisor M Khorvash khorvash@cc iut ac ir G R Ghorbani ghorbani@cc iut ac ir Abstract The current study was conducted to investigate the conditions of Isfahan industrial dairy farms in terms of particle size and the supply of physically effective fibre and its effects on physiological responses health production and milk component In this experiment a total of industrial dairy cattle farms were studied One group of the high producing cows mean kg and mid lactation Mean days per farm with cows having more than two parturitions were chosen and studied for a week with daily evaluation of feed particle size the pattern of feed residual milk production and composition Within this week chewing activity was recorded for duration of hrs and rumen pH was measured at the end of the week The results indicated that farms were different in terms of feed particle size The differences in geometric mean particle size was up to mm and considering the physically effective fiber based on university of Pennsylvania new recommendations the differences were up to percent among the herds P Subsequently these herds were divided into groups based on geometric mean particle size of the feed as fine medium and coarse particles It was observed that increasing particle size was associated with an increase in physically effective NDF P As days passed cows were tending to select in favour of fine particles and against coarse particles but no differences between treatments in the selection process of the material according to Pennsylvania sieves were detected However selection against effective physical fiber increased with particle size increasing P Increase in particle size did not affect the eating behavior of the herd but these herds tended to increase rumination with increasing particle size Herds in the medium particle size group significantly showed more rumination activity relative to those in fine particle size group P This phenomenon led to a change in the production of milk milk fat and other milk fat related parameters with varying the particle size so that the animals in medium particle size group had the highest performance and the fine particle size group had the poorest performance P The fat to protein ratio was less than one in fine particle size group and was significantly lower compared to the other treatments P accordingly it seems that these cows have been in sub acute acidosis condition Generally it could be concluded that based on these results herds offered feed with a geometric mean particle size of mm and physically effective fiber of had the best productive performance and health status and smaller or higher particle size would negatively affect performance and health of dairy cattle Keywords feed particle size physically effective fiber dairy cattle herd milk production milk fat PDF created with pdfFactory trial version www pdffactory com
استاد راهنما :
محمد خوروش، غلامرضا قرباني
استاد مشاور :
سعيد انصاري مهياري، احمد رياسي
استاد داور :
مسعود عليخاني، علي نصيرپور
