نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه علوم دامی، دانشکده کشاورزی، دانشگاه صنعتی اصقهان، اصفهان، ایران.

2 استاد،هیئت علمی دانشگاه صنعتی اصفهان

3 . استاد، گروه علوم دامی، دانشکده کشاورزی، دانشگاه صنعتی، اصفهان ایران

4 دانشیار،اصفهان- دانشگاه صنعتی اصفهان- دانشکده کشاورزی- گروه علوم دامی

5 دانشیار دانشگاه صنعتی اصفهان، تخصص: فیزیولوژی پرندگان/ ایمونولوژی

6 مربی،بخش تحقیقات علوم دامی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی اصفهان، سازمان تحقیقات آموزش و ترویج کشاورزی، اصفهان. ایران

7 استادیار. محقق، موسسه فیزیولوژی و زیست‏شناسی سلولی، دانشگاه دامپزشکی هانوفر، هانوفر، آلمان

چکیده

اثر سطوح اسیدوز متابولیکی خفیف ایجاد شده توسط جیره آنیونی بر عملکرد گاوهای شیری در دوره انتقال، با استفاده از 12 رأس گاو هلشتاین طی بازه زمانی 21 روز پیش از زمان زایش، بررسی شد. در هفته پیش از زایش، گاوها با توجه به pH ادرار (UpH)، به گروه توصیه شده 6/3 تا 7 (R UpH) و کمتر از 6/3 (low UpH) تقسیم شدند. میانگین pH ادرار در گروهR UpH، 6/7 و در low UpH، 5/8 بود(p<0/01) . غلظت سرمی کلسیم در پیش از زایمان تحت تأثیر قرار نگرفت، اما در دو ساعت پس از زایمان، در گروه low UpH افزایش یافت (P<0/01). غلظت سرمی خون گاوهای low UpH در پیش از زایمان تمایل به افزایش داشت (P=0/08). مصرف خوراک در پیش از زایش تحت تاثیر رار نگرفت، اما گاوهای low UpH مصرف خوراک و تولید شیر بیشتری در  هفته اول پس از زایمان داشتند (P<0/05). در روز پیش از زایمان، غلظت پروتئین کل و گلوبولین خون در گروه low UpH کاهش یافت(P<0/05). پس از زایش نیز، غلظت نیتروژن اوره ای، پروتئین کل، گلوبولین خون و پروتئین شیر در این گاوها کم تر بود (P<0/05). بنابراین، القای سطوح بالاتر اسیدوز متابولیکی نسبت به سطح توصیه شده در پیش از زایش میتواند غلظت کلسیم خون و عملکرد گاوهای دوره انتقال را بهبود دهد.

کلیدواژه‌ها

عنوان مقاله [English]

The effect of Induction of different levels of mild metabolic acidosis by anionic diet on mineral homeostasis and performance of transition Holstein dairy cows

نویسندگان [English]

  • Abbas Rajaeerad 1
  • Gholam Reza Ghorbani 2
  • Mohammad Khorvash 3
  • Ali Sadeghi-Sefidmazgi 4
  • Amir Hossein Mahdavi 5
  • Masoud Boroumand Jazi 6
  • Mirja Rosmarie Wilkens 7

1 Ph.D. student, Department of Animal Sciences, College of Agriculture, Isfahan University of Technology, Isfahan, Iran

2 Professor, Department of Animal Sciences, College of Agriculture, Isfahan University of Technology, Isfahan, Iran.

3 Professor, Department of Animal Sciences, College of Agriculture, Isfahan University of Technology, Isfahan, Iran.

4 Associate Professor, Department of Animal Sciences, College of Agriculture, Isfahan University of Technology, Isfahan, Iran

5 Department of Animal Sciences, College of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran

6 Researcher, Animal Science Research Department, Isfahan Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization(AREEO), Isfahan, Iran.

7 Researcher, Institute of Physiology and Cell Biology, University of Veterinary Medicine of Hannover, Hannover, Germany

چکیده [English]

The effects of different levels of mild metabolic acidosis by anionic diet on the performance of transition dairy cows were investegieted in 12 cows from 3 weeks (wk) before calving. One wk before calving, cows assigned to two groups according to urine pH (UpH) to recommended level (R UpH=6.2 to 7) and less than 6.3 (low UpH). The average prepartum urine pH was 6.7 and 5.8 for R UpH and low UpH groups, respectively (P<0.01). The prepartum serum concentration of Ca was not affected by the experimental groups, but significantly increased in the low UpH group within 2 h after calving. A trend was observed for higher serum concentration of phosphorus in the low UpH cows before calving. Although no significant difference was observed in prepartum DMI, but postpartum DMI and milk production were higher during wk 1 after calving in low UpH group (P<0.05). Total concentrations of protein and globulin were decreased on the day before calving in low UpH group. Also, after calving the concentrations of BUN, total protein, globulin, and milk protein were lower in this group of cows (P<0.05). Therefore, the induction of higher levels of metabolic acidosis in comparison to the recommended level before calving, can improve serum concentration of Ca and performance of transition cows.

کلیدواژه‌ها [English]

  • Anionic diet
  • Calcium homeostasis
  • Transition period
  • Urine pH
  • Performance

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