نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه علوم دامی، دانشکده کشاورزی، دانشگاه شهرکرد، ایران.

2 استاد، گروه علوم دامی، دانشکده کشاورزی، دانشگاه شهرکرد، ایران.

3 استاد گروه علوم دامی دانشکده کشاورزی دانشگاه شیراز

چکیده

چکیده
هدف این پژوهش، بررسی اثر جایگزینی الیاف سلولزی (کاه گندم) با الیاف غیر سلولزی (تفاله چغندرقند) در جیره گاوهای شیری دوره انتقال (از روز 21 پیش از زایش و تا روز 42 پس از زایش) بود. بدین منظور، 21 روز پیش از زایش، از 36 راس گاو هلشتاین چند شکم زایش با میانگین وزن 59/6 ± 697 کیلوگرم و نمره بدنی 0/22 ± 3/3 استفاده شد. پیش از زایش، گاوها به دو گروه تقسیم شدند و جیره‌های دارای 7/17 درصد کاه گندم و یا 7/17 درصد تفاله چغندرقند، دریافت کردند. پس از زایش نیز هر گروه به دو زیر گروه تقسیم شد و جیره‌ای بر پایه 5 درصد کاه گندم یا تفاله چغندرقند دریافت کردند. نتایج نشان دادند که تفاوت در منبع الیافی جیره، تأثیری بر مصرف خوراک در دوره پیش از زایش نداشت؛ ولی گوارش‏ پذیری ماده خشک و ماده آلی و دیوارۀ سلولی در گاوهایی که جیره دارای تفاله چغندر قند مصرف کرده بودند، بیشتر بود. گوارش‏ پذیری ماده خشک (p=0/05) و دیواره سلولی (p=0/06) در گاوهایی کمتر بود که در دورههای پیش از زایش و نیز پس از زایش، کاه گندم مصرف کرده بودند. شیر تصحیح شده بر پایۀ چربی و انرژی و همچنین درصد چربی شیر در گاوهایی که پیش از زایش تفاله چغندرقند دریافت کردند، تمایل به افزایش داشت (p=0/09). نتایج این پژوهش نشان داد که تغذیه منابع الیافی غیر سلولزی، می‏تواند عملکرد گاوهای دوره انتقال را بهبود بخشد.

کلیدواژه‌ها

عنوان مقاله [English]

The effect of fiber source on dry matter and energy intake, nutrient digestibility, and performance in transition dairy cows

نویسندگان [English]

  • Ali Nargeskhani 1
  • Ali Moharrery 2
  • Hossein Mehraban 2
  • Mohammad Javad Zamiri 3

1 Department of Animal Sciences, Agricultural College, Shahrekord University, Shahrekord, Iran

2 Animal Science Department, Agricultural College, Shahrekord University

3 Department of Animal Science, Agricultural College, Shiraz University, Shiraz, Iran

چکیده [English]

This study was conducted to compare the effect of a cellulosic (wheat straw; WS) and non-cellulosic (beet pulp; BP) forage source on high producing
dairy cows during the transition period (three weeks before to six weeks after calving). Multiparous Holstein cows (n=36) with mean body weight of
697±59.6 kg and body condition score of 3.3±0.22 were used in the experiment. Before calving, the cows received diets containing 7.17% WS (n=18)
or BP (n=18). After calving, the cows in each group were divided into two subgroups (n=9), and received the diets containing 5% BP or WS.
Prepartum dry matter intake (DMI) was similar between dietary treatments but prepartum digestibility of DM (P=0.05) and neutral detergent fiber (P=
0.06) was lower in cows feeding on the WS diet. The yield of energy-corrected milk, 4% fat-corrected milk and milk fat percentage tended to be
higher in the cows fed with the BP diet during the prepartum period (P = 0.09). In conclusion, the results showed that feeding non-cellulosic forages
during the transition period may improve the performance in dairy cows.

کلیدواژه‌ها [English]

  • Keywords: Digestibility
  • Milk production
  • Sugar beet pulp
  • Transition period
  • wheat straw
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