اثر تغذیه انواع متفاوت کنجاله سویا و دانه جو فرآوری شده متفاوت روی عملکرد گاوهای هلشتاین شیری با تولید بالا
Subject Areas : Camel
ا. خطیبی شهری
1
(
Department of Animal Science, Imam Reza International University of Mashhad, Mashhad, Iran
)
م. دانش مسگران
2
(
گروه علوم دامی-دانشگاه فردوسی مشهد-مشهد-ایران
)
د. زحمتکش
3
(
Department of Animal Science, University of Zanjan, Zanjan, Iran
)
Keywords: کنجاله سویا, گاوهای هلشتاین, جو آسیاب شده, جو پرک شده, کنجاله سویا محافظت شده با زایلوز,
Abstract :
بیست و چهار گاو شیری هلشتاین در یک طرح کاملاً تصادفی برای بررسی اثر کنجاله سویا (SM) و کنجاله سویا محافظت شده با زایلوز (XSM) در ترکیب با جو آسیاب شده (GB) یا جو پرک شده (FB) روی ماده خشک مصرفی، تولید شیر، تخمیر شکمبه‌ای و پاسخ‌های خونی استفاده شدند. دوره آزمایش 30 روز به طول انجامید. جیره‌ها شامل تهیه 85/19 درصد سیلاژ ذرت، 02/12 درصد علوفه یونجه، 72/0 درصد کاه گندم و 41/67 درصد کنسانتره با متوسط 17 درصد پروتیئن خام (براساس DM) روزانه دوبار پیشنهاد شدند. ماده خشک مصرفی (DMI) (051/0P=) و مقدار شیر (0001/0>P) با XSM در جیره‌های با GB یا FB کاهش یافت (05/0>P). جیره‌های تغذیه شده حیوانات محتوی XSM چربی شیر تصحیح شده (FCM 3.5%) و انرژی تصحیح شده شیر (ECM) کمتری نسبت به جیره‌های محتوی SM (05/0>P) داشتند. چربی شیر و مواد جامد نه درصد چربی در XSM به طور معنی‌داری بیشتر از SM (05/0>P) بودند اما درصد پروتئین شیر پایین‌تر بود (05/0>P). مقایسه جیره‌های GB در مقابل FB و SM در مقابل XSM نشان داد که مقدار پروتئین شیر برای جیره‌های حاوی FB (05/0>P) و حاوی SM (001/0>P) بالاتر بود. متابولیت‌های خونی به طور معنی‌داری بین تیمارها متفاوت بود (05/0>P). جیره‌های حاوی XSM سطوح پایین‌تری از اسیدهای چرب غیر استریفه و سطوح بالاتری نیتروژن اوره‌ای خون نسبت به جیره‌های حاوی SM (05/0>P) داشتند. غلظت‌های استات، پروپیونات، والرات و بوتیرات به طور معنی‌داری بین جیره‌ها متفاوت بود (05/0>P). براساس نتایج آزمایش ما، کنجاله سویا در ترکیب با جو آسیاب شده ممکن است عملکرد گاوهای شیری هلشتاین را تغییر دهد.
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