Influence of polymer-coated slow-release urea on total tract apparent digestibility, ruminal fermentation and performance of Nellore steers
Objective Two experiments were performed to evaluate the effects of coated slow-release urea on nutrient digestion, ruminal fermentation, nitrogen utilization, blood glucose and urea concentration (Exp 1), and average daily gain (ADG; Exp 2) of steers. Methods Exp 1: Eight ruminally fistulated steer...
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Asian-Australasian Association of Animal Production Societies
2017-01-01
|
| Series: | Asian-Australasian Journal of Animal Sciences |
| Subjects: | |
| Online Access: | http://www.ajas.info/upload/pdf/ajas-30-1-34.pdf |
| _version_ | 1828356460084461568 |
|---|---|
| author | R. Gardinal G. D. Calomeni N. R. B. Cônsolo C. S. Takiya J. E. Freitas J. R. Gandra T. H. A. Vendramini H. N. Souza F. P. Rennó |
| author_facet | R. Gardinal G. D. Calomeni N. R. B. Cônsolo C. S. Takiya J. E. Freitas J. R. Gandra T. H. A. Vendramini H. N. Souza F. P. Rennó |
| author_sort | R. Gardinal |
| collection | DOAJ |
| description | Objective Two experiments were performed to evaluate the effects of coated slow-release urea on nutrient digestion, ruminal fermentation, nitrogen utilization, blood glucose and urea concentration (Exp 1), and average daily gain (ADG; Exp 2) of steers. Methods Exp 1: Eight ruminally fistulated steers [503±28.5 kg body weight (BW)] were distributed into a d 4×4 Latin square design and assigned to treatments: control (CON), feed grade urea (U2), polymer-coated slow-release urea A (SRA2), and polymer-coated slow-release urea B (SRB2). Dietary urea sources were set at 20 g/kg DM. Exp 2: 84 steers (350.5±26.5 kg initial BW) were distributed to treatments: CON, FGU at 10 or 20 g/kg diet DM (U1 and U2, respectively), coated SRA2 at 10 or 20 g/kg diet DM (SRA1 and SRA2, respectively), and coated SRB at 10 or 20 g/kg diet DM (SRB1 and SRB2, respectively). Results Exp 1: Urea treatments (U2+SRA2+SRB2) decreased (7.4%, p = 0.03) the DM intake and increased (11.4%, p<0.01) crude protein digestibility. Coated slow-release urea (SRA2+SRB2) showed similar nutrient digestibility compwared to feed grade urea (FGU). However, steers fed SRB2 had higher (p = 0.02) DM digestibility compared to those fed SRA2. Urea sources did not affect ruminal fermentation when compared to CON. Although, coated slow-release urea showed lower (p = 0.01) concentration of NH3-N (−10.4%) and acetate to propionate ratio than U2. Coated slow-release urea showed lower (p = 0.02) urinary N and blood urea concentration compared to FGU. Exp 2: Urea sources decreased (p = 0.01) the ADG in relation to CON. Animals fed urea sources at 10 g/kg DM showed higher (12.33%, p = 0.01) ADG compared to those fed urea at 20 g/kg DM. Conclusion Feeding urea decreased the nutrient intake without largely affected the nutrient digestibility. In addition, polymer-coated slow-release urea sources decreased ruminal ammonia concentration and increased ruminal propionate production. Urea at 20 g/kg DM, regardless of source, decreased ADG compared both to CON and diets with urea at 10 g/kg DM. |
| first_indexed | 2024-04-14T02:59:09Z |
| format | Article |
| id | doaj.art-65c8c7bf26ed498bad688496632d5ebc |
| institution | Directory Open Access Journal |
| issn | 1011-2367 1976-5517 |
| language | English |
| last_indexed | 2024-04-14T02:59:09Z |
| publishDate | 2017-01-01 |
| publisher | Asian-Australasian Association of Animal Production Societies |
| record_format | Article |
| series | Asian-Australasian Journal of Animal Sciences |
| spelling | doaj.art-65c8c7bf26ed498bad688496632d5ebc2022-12-22T02:15:58ZengAsian-Australasian Association of Animal Production SocietiesAsian-Australasian Journal of Animal Sciences1011-23671976-55172017-01-01301344110.5713/ajas.16.005823549Influence of polymer-coated slow-release urea on total tract apparent digestibility, ruminal fermentation and performance of Nellore steersR. Gardinal0G. D. Calomeni1N. R. B. Cônsolo2C. S. Takiya3J. E. Freitas4J. R. Gandra5T. H. A. Vendramini6H. N. Souza7F. P. Rennó8 Department of Animal Nutrition and Production, School of Veterinary Medicine and Animal Science, University of Sao Paulo (USP), Pirassununga, SP 13635-900, Brazil Department of Animal Nutrition and Production, School of Veterinary Medicine and Animal Science, University of Sao Paulo (USP), Pirassununga, SP 13635-900, Brazil Department of Animal Nutrition and Production, School of Veterinary Medicine and Animal Science, University of Sao Paulo (USP), Pirassununga, SP 13635-900, Brazil Department of Animal Nutrition and Production, School of Veterinary Medicine and Animal Science, University of Sao Paulo (USP), Pirassununga, SP 13635-900, Brazil Department of Animal Sciences, Federal University of Bahia, Salvador, BA 40170-110, Brazil Department of Animal Sciences, Universidade Federal da Grande Dourados, Dourados, MS 79804-970, Brazil Department of Animal Nutrition and Production, School of Veterinary Medicine and Animal Science, University of Sao Paulo (USP), Pirassununga, SP 13635-900, Brazil Petrobrás, CENPES, 21040-000, Rio de Janeiro, RJ, Brasil Department of Animal Nutrition and Production, School of Veterinary Medicine and Animal Science, University of Sao Paulo (USP), Pirassununga, SP 13635-900, BrazilObjective Two experiments were performed to evaluate the effects of coated slow-release urea on nutrient digestion, ruminal fermentation, nitrogen utilization, blood glucose and urea concentration (Exp 1), and average daily gain (ADG; Exp 2) of steers. Methods Exp 1: Eight ruminally fistulated steers [503±28.5 kg body weight (BW)] were distributed into a d 4×4 Latin square design and assigned to treatments: control (CON), feed grade urea (U2), polymer-coated slow-release urea A (SRA2), and polymer-coated slow-release urea B (SRB2). Dietary urea sources were set at 20 g/kg DM. Exp 2: 84 steers (350.5±26.5 kg initial BW) were distributed to treatments: CON, FGU at 10 or 20 g/kg diet DM (U1 and U2, respectively), coated SRA2 at 10 or 20 g/kg diet DM (SRA1 and SRA2, respectively), and coated SRB at 10 or 20 g/kg diet DM (SRB1 and SRB2, respectively). Results Exp 1: Urea treatments (U2+SRA2+SRB2) decreased (7.4%, p = 0.03) the DM intake and increased (11.4%, p<0.01) crude protein digestibility. Coated slow-release urea (SRA2+SRB2) showed similar nutrient digestibility compwared to feed grade urea (FGU). However, steers fed SRB2 had higher (p = 0.02) DM digestibility compared to those fed SRA2. Urea sources did not affect ruminal fermentation when compared to CON. Although, coated slow-release urea showed lower (p = 0.01) concentration of NH3-N (−10.4%) and acetate to propionate ratio than U2. Coated slow-release urea showed lower (p = 0.02) urinary N and blood urea concentration compared to FGU. Exp 2: Urea sources decreased (p = 0.01) the ADG in relation to CON. Animals fed urea sources at 10 g/kg DM showed higher (12.33%, p = 0.01) ADG compared to those fed urea at 20 g/kg DM. Conclusion Feeding urea decreased the nutrient intake without largely affected the nutrient digestibility. In addition, polymer-coated slow-release urea sources decreased ruminal ammonia concentration and increased ruminal propionate production. Urea at 20 g/kg DM, regardless of source, decreased ADG compared both to CON and diets with urea at 10 g/kg DM.http://www.ajas.info/upload/pdf/ajas-30-1-34.pdfSlow-release UreaAmmoniaAverage Daily GainNon-protein Nitrogen |
| spellingShingle | R. Gardinal G. D. Calomeni N. R. B. Cônsolo C. S. Takiya J. E. Freitas J. R. Gandra T. H. A. Vendramini H. N. Souza F. P. Rennó Influence of polymer-coated slow-release urea on total tract apparent digestibility, ruminal fermentation and performance of Nellore steers Asian-Australasian Journal of Animal Sciences Slow-release Urea Ammonia Average Daily Gain Non-protein Nitrogen |
| title | Influence of polymer-coated slow-release urea on total tract apparent digestibility, ruminal fermentation and performance of Nellore steers |
| title_full | Influence of polymer-coated slow-release urea on total tract apparent digestibility, ruminal fermentation and performance of Nellore steers |
| title_fullStr | Influence of polymer-coated slow-release urea on total tract apparent digestibility, ruminal fermentation and performance of Nellore steers |
| title_full_unstemmed | Influence of polymer-coated slow-release urea on total tract apparent digestibility, ruminal fermentation and performance of Nellore steers |
| title_short | Influence of polymer-coated slow-release urea on total tract apparent digestibility, ruminal fermentation and performance of Nellore steers |
| title_sort | influence of polymer coated slow release urea on total tract apparent digestibility ruminal fermentation and performance of nellore steers |
| topic | Slow-release Urea Ammonia Average Daily Gain Non-protein Nitrogen |
| url | http://www.ajas.info/upload/pdf/ajas-30-1-34.pdf |
| work_keys_str_mv | AT rgardinal influenceofpolymercoatedslowreleaseureaontotaltractapparentdigestibilityruminalfermentationandperformanceofnelloresteers AT gdcalomeni influenceofpolymercoatedslowreleaseureaontotaltractapparentdigestibilityruminalfermentationandperformanceofnelloresteers AT nrbconsolo influenceofpolymercoatedslowreleaseureaontotaltractapparentdigestibilityruminalfermentationandperformanceofnelloresteers AT cstakiya influenceofpolymercoatedslowreleaseureaontotaltractapparentdigestibilityruminalfermentationandperformanceofnelloresteers AT jefreitas influenceofpolymercoatedslowreleaseureaontotaltractapparentdigestibilityruminalfermentationandperformanceofnelloresteers AT jrgandra influenceofpolymercoatedslowreleaseureaontotaltractapparentdigestibilityruminalfermentationandperformanceofnelloresteers AT thavendramini influenceofpolymercoatedslowreleaseureaontotaltractapparentdigestibilityruminalfermentationandperformanceofnelloresteers AT hnsouza influenceofpolymercoatedslowreleaseureaontotaltractapparentdigestibilityruminalfermentationandperformanceofnelloresteers AT fprenno influenceofpolymercoatedslowreleaseureaontotaltractapparentdigestibilityruminalfermentationandperformanceofnelloresteers |