کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8490884 | 1552342 | 2018 | 33 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of rumen undegradable protein on intake, digestibility and rumen kinetics and fermentation characteristics of dairy heifers
ترجمه فارسی عنوان
اثرات پروتئین غیر قابل انجماد شکمبه بر مصرف، هضم و کینتینات شکمبه و ویژگیهای تخمیر تلیسه های شیری
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کلمات کلیدی
VFACPIRDPRUPEMSiNDF - IndfVolatile fatty acids - اسیدهای چرب فرارNitrogen balance - تعادل نیتروژنRån - شتمindigestible neutral detergent fibre - فیبر مواد شوینده بی حس کنندهDOM - قضاوتorganic matter - ماده آلیdigestible organic matter - ماده آلی قابل هضمdry matter - ماده خشکCrude protein intake - مصرف پروتئین خامRate of digestion - میزان هضمRate of passage - نرخ عبورNitrogen - نیتروژنcrude protein - پروتئین خامRumen degradable protein - پروتئین قابل تجزیه استmetabolizable protein - پروتئین متابولیزه کنندهMicrobial protein - پروتئین میکروبیRumen undegradable protein - پروتئین نامنظم رامنefficiency of microbial protein synthesis - کارآیی سنتز پروتئین میکروبی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
چکیده انگلیسی
The aim of this work was to evaluate the influence of increasing amounts of rumen undegradable protein (RUP) on intake, nutrient digestibility, rumen kinetics and fermentation characteristics and N use efficiency of dairy Holstein heifers. Eight rumen-cannulated Holstein heifers (initial body weight 276â±â8.3âkg) were used in a replicate 4âÃâ4 Latin square design with four dietary RUP amounts in the total dietary protein, as follows: 38% of RUP (38RUP), 44% of RUP (44RUP), 51% of RUP (51RUP) and 57% of RUP (57RUP). The experimental period was 84 days, subdivided into four periods of 21 days (14 days for adaptation + 7 days for collections). Eight spot collections of faeces, urine, ruminal content and omasal digesta were performed at 9-h intervals, as follows: on 15th day samples were collected at 0600âh and 1500âh; on 16th day samples were collected at 0000âh, 0900âh and 1800âh; on 17th day samples were collected at 0300âh, 1200âh and 2100âh. Two complete rumen evacuations were performed: one on 19th day 4âh after morning feeding and another on 21st day immediately before morning feeding. Total (kg/day) and relative (g/kg of body weight) intake of dry matter, crude protein (CP), neutral detergent fibre corrected for ash and protein were not affected (Pâ>â 0.10) by dietary RUP amounts. Ruminal (Pâ=â 0.06) and intestinal (Pâ=â 0.09) digestibilities of CP presented a tendency to decrease with increasing RUP. There were no effects of dietary RUP amounts (Pâ>â 0.10) on the rates of ingestion, passage and digestion (%/h) as well on the total volatile fatty acid concentration in the rumen. Urinary N excretion presented a tendency (Pâ=â 0.08) to decrease with increasing RUP. In addition, retained N presented a tendency (Pâ=â 0.09) to increase according to dietary RUP amounts and greater values were observed for treatments 51RUP and 57RUP. Microbial protein synthesis, microbial efficiency and the efficiency of use of N for microbial synthesis decreased with increasing RUP (Pâ<â 0.05). Metabolisable protein flow presented a tendency to increase (Pâ=â 0.091) and greater values were observed for 51RUP and 57RUP. In general, urinary N excretion decreased, while the flow of metabolisable protein and RUP increased with increasing RUP levels. As a consequence of this pattern, the treatments 51RUP and 57RUP presented increases in the retained N.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Animal Feed Science and Technology - Volume 244, October 2018, Pages 1-10
Journal: Animal Feed Science and Technology - Volume 244, October 2018, Pages 1-10
نویسندگان
Alex L. Silva, Edenio Detmann, Luciana N. Rennó, Alexandre M. Pedroso, Marta M.S. Fontes, Valber C. Morais, Anna L.L. Sguizzato, Marcelo B. Abreu, Polyana P. Rotta, Marcos I. Marcondes,