کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11025844 | 1666506 | 2018 | 28 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Evaluation of collection days and times to estimate urinary excretion of purine derivatives and nitrogen compounds in grazing Nellore cattle
ترجمه فارسی عنوان
ارزیابی روز و زمان جمع آوری تخمک های ادراری مشتقات پورین و ترکیبات نیتروژن در گاو نر
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کلمات کلیدی
آلتوئین، گاو، مجموعه زمان، کراتینین، حجم ادرار،
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
چکیده انگلیسی
The objectives of this study were to evaluate the effects of collection day and 4-hour collection times on the urinary excretion of creatinine, purine derivatives (PD), and nitrogen compounds in grazing Zebu cattle. Five Nellore heifers (300â¯Â±â¯15.2â¯kg body weight [BW]) were used in a 5â¯Ãâ¯5 Latin square design. Five treatments were tested: a mineral mixture supplied at 60â¯g/day (g/d) (control - CON); two treatments higher in salt and urea to achieve a reduced ad libitum intake of supplements: one with 39.7% crude protein (CP) on a dry matter (DM) basis (RI40) and another with 69.4% CP (RI70), both fed ad libitum; and two supplements with restricted feeding rates relative to BW: both with 20.3% of CP fed at 5â¯g/kg BW (BW5) or 10â¯g/kg BW (BW10). Each experimental period lasted 17 d (12 used for adaptation and 5 for sample collection). Six collection times at 4-hour intervals were established for each 24-hour collection day. For total urine collection, a Foley catheter was used and the collection bag attached to the animal was emptied every 4â¯h. Collection day, collection time, treatment or their interactions (Pâ¯>â¯0.05) had no effect on urinary excretions of creatinine, allantoin, uric acid, and PD, nor on their ratio with creatinine. However, an interaction between collection times and treatment (Pâ¯<â¯0.05) was observed for the excretions of urinary nitrogen and urea nitrogen, and for their ratio with creatinine. The results supported the use of a single day-collection estimate the excretion of purine derivatives and nitrogen compounds in beef cattle kept in pasture. A single urine collection for 4-hour obtained at any time during the day was adequate to estimate the purine derivatives excretion. However, using a single 4-hour urine collection to estimate the urinary excretion of nitrogen compounds in grazing Zebu cattle is not recommended.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Livestock Science - Volume 217, November 2018, Pages 85-91
Journal: Livestock Science - Volume 217, November 2018, Pages 85-91
نویسندگان
J.M. Júnior, L.N. Rennó, S.C. Valadares Filho, M.F. Paulino, E. Detmann, G.C.C. Menezes, T.S. Martins, R.M. Paula, J.P.P. Rodrigues, M.I. Marcondes,