پديد آورنده :
كياني، ابوالفضل
عنوان :
تاثير دفعات دوشش بر كميت و كيفيت شير، متابوليت هاي خون و برخي فراسنجه هاي توليد مثلي گاوهاي تازه زا
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي
صفحه شمار :
ده،43ص.: جدول،
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
احمد رياسي، سعيد انصاري مهياري
استاد مشاور :
غلامرضا قرباني، محمد خوروش
توصيفگر ها :
گاو هلشتاين , توليد و تركيبات شير
تاريخ نمايه سازي :
10/2/92
استاد داور :
مسعود عليخاني، علي نصيرپور
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Effect of milking frequency on milk production blood metabolites and some reproductive parameters of Holstein dairy cows during early lactation Abolfazl Kiani Kiany00000@yahoo com Date of Submission December 19 2012 Department of Animal Science Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi riasi@cc iut ac ir Supervisor A Riasi and S Ansari Abstract An experiment was conducted to study the effects of different milking frequencies on milk and reproductive performance of Holstein dairy cows during early lactation For this pourpose 21 multiparous Holsteins dairy cows were assigned in three treatments and 7 cows in each Treatments were 1 three times milking per day for 42 days after calving 3X 2 milking six times per day for 21 days after calving and then change to three times subsequently 6X 3X and 3 milking six times per day for 42 days after calving 6X Average daily dry matter intake DMI body weight changes average daily milk production and its composition some blood metabolites and progesterone concentrations and also the reproductive parameters were measured every week Results showed that the milking strategies had no significant effect on DMI In 42 days weight loss in treatment 6x was more than the other treatments and these differences tend to be statistically significant P 0 1 Average milk and FCM yield were greater in 6x cows than 3x during the first and second 21 days of lactation P 0 05 These traits also were greater in 6x cows than 3x during the total experimental period P 0 05 However the 6x 3x treatment had no significant difference with the other treatments Miilk fat was affected by milking strategies During the first 21 days of lactation and in total experimental period 6x cows had higher P 0 05 daily milk fat yield than 3x cows Among blood metabolites 6x cows had higher NEFA concentration than 3x cows P 0 05 however the other metabolites and progesterone were not significantly affected by treatments Reproductive parameters including the number of artificial insemination per cow days to first insemination and open days were not affected by milking strategies The results showed that 6 times milking per day during the first 42 days of lactation may increase milk production in Holstein dairy cows without any negative effect on reproductive parameters Keywords milking frequency Holstein cows milk production blood metabolites reproduction
استاد راهنما :
احمد رياسي، سعيد انصاري مهياري
استاد مشاور :
غلامرضا قرباني، محمد خوروش
استاد داور :
مسعود عليخاني، علي نصيرپور
