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فراسنجه‌های متابولیک، وضعیت ضداکسیداتیو، تغییرات وزن بدن و عملکرد گاوها طی دوره انتقال

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار، گروه علوم دامی، دانشکده کشاورزی، دانشگاه صنعتی اصفهان، اصفهان، 83111-84156، ایران

2 دانشجوی دکتری، گروه علوم دامی، دانشکده کشاورزی، دانشگاه صنعتی اصفهان، اصفهان، 83111-84156، ایران

3 دانشیار، گروه علوم دامی، دانشکده کشاورزی، دانشگاه صنعتی اصفهان، اصفهان، 83111-84156، ایران

چکیده

در این پژوهش، تفاوت­های متابولیک و وضعیت ضد­اکسیداتیو، تغییرات وزن و عملکرد تولیدی شمار 12 راس ﮔﺎو هلشتاین یک­بار زایش (وزن زایش 48±643) در مقایسه با 15 راس گاو چندبار زایش (وزن زایش 65±773) طی دوره انتقال بررسی شدند. نمونه خون جهت تجزیه فراسنجه­های متابولیک و ضد­اکسیداتیو در روزهای 14-، 1+ و 21+ (نسبت به زایمان)، وزن بدن و نمره بدنی در روزهای 21-، 1+ و 21+، مصرف خوراک در کل دوره و تولید شیر اندازه­گیری شد. خوراک مصرفی بین دو گروه پیش از زایمان مشابه بود ولی پس از زایمان، مصرف خوراک، تولید شیر و راندمان تولید شیر در گاوهای چندبار زایش بیشتر از گاوهای یک­بار زایش بود. وزن بدن و نمره بدنی در هر دو گروه گاوهای یک­بار و چندبار زایش روندی کاهشی در طی دوره انتقال داشتند ولی گاوهای چندبار زایش شدت توازن منفی انرژی (02/0P=) و تمایل (07/0P=) به کاهش وزن بیشتری پس از زایمان داشتند. غلظت اسیدهای چرب غیراستریفه، بتاهیدروکسی بوتیرات و کلسترول در هر دو گروه مشابه بود، هرچند سطح گلوکز خون گاوهای یک­بار زایش بیشتر از گاوهای چندبار زایش بود. از لحاظ وضعیت ضداکسیداتیو، غلظت مالون دی آلدهید زمان زایمان بیشتر و کل ظرفیت آنتی اکسیدانی پس از زایمان کمتری برای گاوهای یک­بار زایش نسبت به چندبار زایش مشاهده شد. از نظر ارتباط بین فراسنجه­های مختلف با عملکرد، سطح مالون دی­آلدهید خون همبستگی معنی­دار بالایی با توازن انرژی و همچنین عملکرد تولیدی گاوها داشت. نتایج نشان می­دهد گاوهای یک­بار زایش تحت شرایط تنش اکسیداتیو بیشتری نسبت به گاوهای چندبار زایش هستند ولی شدت بار متابولیک و توازن منفی انرژی کمتری طی دوره انتقال دارند.

کلیدواژه‌ها


عنوان مقاله [English]

Metabolic profile and antioxidative status, body weight, and performance of dairy cows in the periparturient period

نویسندگان [English]

  • Ebrahim Ghasemi 1
  • Mohammad Hossein Safari Foroshani 2
  • Masood Alikhani 3
  • Javad Shirani-Shamsabadi 2
1 Assistant Professor, Department of Animal Science, College of Agriculture, Isfahan University of Technology, Iran
2 Ph.D. Candidate, Department of Animal Science, College of Agriculture, Isfahan University of Technology, Iran
3 Associate Professor, Department of Animal Science, College of Agriculture, Isfahan University of Technology, Iran
چکیده [English]

In this study, the metabolic and antioxidative differences, BW changes and performane of12 primiparous (parturition BW 643±48 kg BW) and 15 multiparous (parturition BW 773±65 kg) cows were investigated during transition period. Blood sample for antioxidative and metabolic parameters on d -14, +1, and +21 (relative to parturition), DMI throughout the entire period, BW and BCS on d -21, +1, and +21 and milk yeild were measured. In prepartum, both groups had similar DMI, but DMI and milk yield were greater in multiparous than primiparous cows in postpartum. BW and BCS were decreased in both primiparous and multiparous cows during transition period, but multiparous cows tended to have more BW loss and negative energy balance after parturition. Concentrations of non-esterified fatty acids, beta hydroxy butyrate, and cholesterol were similar, but glucose level was lower in multiparous than primiparous cows. Regarding antioxidative status, primiparous cows had lower antioxidative status as malondialdehyde concentration at parturition was higher and that of total antioxidative status at postpartum were lower than multiparous cows. Regarding performance related parameters, mlondialdehyde level could be an apropriate index of energy balance, health and performance status. It is concluded that primiparous cows were under more oxidative stress during transtion period, but metabolic load and negative energy balance were more sever in multiparous cows.

کلیدواژه‌ها [English]

  • antioxidative status
  • metabolic profile
  • Multiparous
  • primiparous
  • Transition period
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