نوع مقاله : مقاله پژوهشی
نویسنده
نویسنده مسئول، گروه علوم دام و طیور، دانشکده فناوری کشاورزی ابوریحان، دانشکدگان کشاورزی و منابع طبیعی، دانشگاه تهران، پاکدشت، ایران.
چکیده
اثر بیکربنات سدیم و مکمل بافری pHmax بر ساخت چربی شیر در شرایط افت چربی شیر، با استفاده از 24 راس گاو شیرده هلشتاین در قالب طرح بلوکهای کاملاً تصادفی بررسی شد. افت چربی شیر به‌مدت 10 روز در همه گاوها با تغذیه جیره حاوی نشاسته بالا القاء گردید. آزمایش در دو دوره شامل دوره اول (روز یک تا 20)، اختصاص گاوها به‌طور تصادفی به تیمارهای 1- شاهد، 2- جیره پایه + 0/8 درصد pHmax و 3- جیره پایه + 0/8 درصد بیکربنات سدیم و دوره دوم (روز 21 تا 30)، تغذیه همه گاوها با جیره شاهد انجام شد. مکملهای بافری بر افزایش غلظت چربی شیر مؤثر بودند، بدون این‌که مصرف خوراک، تولید شیر، غلظت پروتئین و لاکتوز را تحت تأثیر قرار دهند. غلظت کل اسیدهای چرب ترانس در تیمارهای آزمایشی در مقایسه با شاهد کاهش یافت. نسبت ترانس-10 به ترانس-11 در گاوهای دریافت‌کننده ترکیبات بافری در مقایسه با شاهد کم‌تر شد که بیانگر تأثیر این ترکیبات بر بهبود ساخت چربی شیر از طریق تحریک مسیرهای طبیعی بیوهیدروژناسیون اسیدهای چرب در شکمبه میباشد. افزودن مکملهای بافری ساخت چربی شیر را افزایش داد به‌طوری که این اثرات تا یک هفته پس از حذف ترکیبات مذکور ماندگار بود. بنابراین استفاده از بیکربنات سدیم و pHmax میتواند چربی شیر را در گاوهای شیری تغذیه‌شده با جیرههای حاوی نشاسته بالا و تحت شرایط افت چربی شیر حفظ نماید. هم‌چنین، استفاده از pHmax هزینههای استفاده از ترکیبات بافری رایج مانند بیکربنات سدیم را کاهش میدهد.
کلیدواژه‌ها
عنوان مقاله [English]
Effect of supplementation of sodium and magnesium-based buffer compounds on milk fat synthesis of Holstein cows under milk fat depression conditions
نویسنده [English]
- Behzad Khorrami
Department of Animal and Poultry Sciences, College of Aburaihan, University of Tehran
چکیده [English]
Effect of sodium bicarbonate and pHmax buffer supplement on milk fat synthesis under milk fat depression conditions, using of 24 Holstein lactating cows were investigated in a completely randomized block design. Milk fat depression was induced in all cows for 10 d by feeding a diet containing high levels of starch. The experiment was conducted in two periods including: first period (day 1 to 20), allocation of cows to the treatments 1) control, 2) basal diet + 0.8% pHmax and 3) basal diet + 0.8% sodium bicarbonate and in the second period (days 21 to 30), all cows were fed the control diet. Buffer supplements increased milk fat concentration, without affecting dry matter intake, milk yield, and milk protein and lactose concentrations. The concentration of total trans fatty acids decreased in the experimental treatments compared to the control. The trans -10: trans -11 ratio was lower in cows receiving the buffer supplements compared with cows receiving the control, which indicating the effect of these compounds on the improvement of milk fat synthesis by stimulating normal fatty acid biohydrogenation pathways in the rumen. Addition of buffer supplements increased milk fat synthesis, which persisted for one week after cessation of mentioned compounds. Therefore, using of sodium bicarbonate and pHmax can maintain milk fat in dairy cows fed with diets containing high starch and under milk fat depression conditions. Also, using of pHmax reduces the costs of using common buffer compounds such as sodium bicarbonate.
کلیدواژه‌ها [English]
- Buffer supplement
- Dairy cow
- Milk fat depression
- Sodium bicarbonate
- Trans fatty acid
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