کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5538892 | 1552360 | 2017 | 32 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Restricting the time of access to fresh forage reduces intake and energy balance but does not affect the digestive utilization of nutrients in beef heifers
ترجمه فارسی عنوان
محدود کردن زمان دسترسی به علوفه تازه باعث کاهش تعادل مصرف و انرژی می شود اما بر مصرف گوشت مواد مغذی در تلیسه های گوشت گاو تاثیر نمی گذارد
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کلمات کلیدی
ADFT24NDFDCEVFADOMIDMIN intakeMEB - MONEIngestion - آلزایمرvolatile fatty acid - اسید چرب فرارacid detergent fibre expressed inclusive of residual ash - الیاف پاک کننده اسید بیانگر شامل خاکستر باقی مانده استstandard deviation - انحراف معیارMetabolizable energy - انرژی متابولیزه شدهgross energy - انرژی ناخالصRuminal fermentation - تخمیر شفافstandard error of the means - خطای استاندارد از وسایلFasting - روزه داریCoefficient of Variation - ضریب تغییرDigestibility - قابلیت هضمorganic matter - ماده آلیdry matter - ماده خشکSEM - مدل معادلات ساختاری / میکروسکوپ الکترونی روبشیurinary purine derivatives - مشتقات پورین ادرارdry matter intake - مصرف ماده خشکbody weight - وزن بدنcrude protein - پروتئین خامMicrobial protein - پروتئین میکروبیBeef cattle - گاو گوشت گاو
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
چکیده انگلیسی
The effect of restricting the time of access to a high-quality fresh forage on the intake and digestion of nutrients was studied in heifers. Twenty-four Hereford heifers (body weight (BW) 153 ± 18 kg) housed in metabolic cages were randomized according to a BW-based block design and were randomly assigned to receive one of the four following treatments: 24, 8, 6 or 4 h of daily access to freshly cut pasture (Lolium multiflorum and Trifolium repens) (T24, T8, T6 and T4, respectively). Their feeding behavior (classified according to the categories of 'eating', 'ruminating' or 'other'), intake rate, intake and digestibility of nutrients, ruminal environment, microbial protein synthesis and blood markers of energy and protein metabolism were assessed. The intake for all of the feed fractions decreased at an increasing rate (from 6 h of access) as the time of access to forage decreased (linear: P < 0.001; quadratic: P < 0.035). During the first 4 h of feeding, animals linearly increased the eating time and the intake rate (P < 0.001 and P = 0.006, respectively), and decreased the ruminating time (P = 0.014) as the time of access to forage decreased. Neither forage digestibility, nor ruminal microbial protein synthesis efficiency, were affected by the restrictions. The metabolizable energy balance linearly decreased (P < 0.001) and N retention decreased at an increasing rate (from 8 h of access; linear: P < 0.003, quadratic P < 0.030), with decreasing time of access to forage. The ruminal pH and NH3-N concentration were affected by treatment and time (P < 0.001). Ruminal pH increased at an increasing rate (from 8 h of access) as the time of access to forage decreased. Meanwhile, NH3-N concentration linearly decreased as the time of access to forage decreased. There was a significant interaction between treatment and time for pH and NH3-N (P < 0.001), being both variables less stable during the day in restricted animals than in unrestricted ones. The concentrations of blood glucose, urea and insulin were not affected by the restrictions. In general, the effects of the restriction seem to have been less evident on digestion than on ingestion. Fasting beef heifers led to behavioral changes in order to maintain the dry matter intake, but these changes resulted insufficient when the time of access to forage drops below 6 h per day.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Animal Feed Science and Technology - Volume 226, April 2017, Pages 103-112
Journal: Animal Feed Science and Technology - Volume 226, April 2017, Pages 103-112
نویسندگان
Alicia Félix, José Luis Repetto, Natalia Hernández, AnalÃa Pérez-Ruchel, Cecilia Cajarville,