Influence of polymer-coated slow-release urea on total tract apparent digestibility, ruminal fermentation and performance of Nellore steers
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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.
Abstract
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.
참고문헌 (35)
- Sinclair LA, "The partial replacement of soybean meal and rapeseed meal with feed grade urea or a slow-release urea and its effect on the performance and metabolism and digestibility in dairy cows", Animal, 6, pp.920~927 (2012)
- Ayasan T, "Importance of milk urea nitrogen of dairy cow nutrition", J Agric Fac Gaziosmanpasa Univ, 26, pp.27~33 (2009)
- Galo E, "Effects of a polymer coated urea product on nitrogen metabolism in lactating Holstein dairy cattle", J Dairy Sci, 86, pp.2154~2162 (2003)
- Reynolds CK, "Nitrogen recycling through the gut and the nitrogen economy of ruminants: An asynchronous symbiosis", J Anim Sci, 86, pp.E293~E305 (2008)
- Taylor-Edwards CC, "Influence of slow-release urea on nitrogen balance and portal drained visceral nutrient flux in beef steers", J Anim Sci, 87, pp.209~221 (2009)
- Cherdthong A, "Effects of urea-calcium mixture in concentrate containing high cassava chip on feed intake, rumen fermentation and performance of lactating dairy cows fed on rice straw", Livest Sci, 136, pp.76~84 (2011)
- Russell JB, "A net carbohydrate and protein system for evaluating cattle diets: I. Ruminal fermentation", J Anim Sci, 70, pp.3551~3561 (1992)
- Pinos-Rodríguez JM, "Effects of a slow-release coated urea product on growth performance and ruminal fermentation in beef steers", Ital J Anim Sci, 9, pp.e4~ (2010)
- Calomeni GD, "Effects of polymer-coated slow-release urea on performance, ruminal fermentation, and blood metabolites in dairy cows", R Bras Zootec, 44, pp.327~334 (2015)
- Valadares Filho SC, "Effect of replacing alfalfa silage with high moisture corn on nutrient utilization and milk production", J Dairy Sci, 83, pp.106~114 (2000)
- NRC, "Nutrient requirements of beef cattle" (2000), National Academies Press
- AOAC International, "Official Methods of Analysis" (2000), Association of Official Analytical Chemists
- Van Soest PJ, "Methods for dietary fibre, neutral detergent fibre and non-starch polysaccharides in relation to animal nutrition", J Dairy Sci, 74, pp.3583~3597 (1991)
- Casali AO, "Influence of incubation time and particles size on indigestible compounds contents in cattle feeds and feces obtained by in situ procedures", R Bras Zootec, 37, pp.335~342 (2008)
- Vendramini THA, "Effects of a blend of essential oils, chitosan or monensin on nutrient intake and digestibility of lactating dairy cows", Anim Feed Sci Technol, 214, pp.12~21 (2016)
- Broderick GA, "Automated simultaneous determination of ammonia and total amino acids in ruminal fluid and in vitro media", J Dairy Sci, 63, pp.64~75 (1980)
- Fujihara T, "The effect of protein infusion on urinary excretion of purine derivatives in ruminants nourished by intragastric nutrition", J Agric Sci, 109, pp.7~12 (1987)
- Estimation of Microbial Protein Supply to Sheep and Cattle Based on Urinary Excretion of Purine Derivatives – An Overview of Technical Details, "Chen XB", International Feed Researches Unit, Rowett Research Institute, ~ (1992)
- Valadares RFD, "Effect of replacing alfalfa silage with high moisture corn on ruminal protein synthesis estimated from excretion of total purine derivatives", J Dairy Sci, 82, pp.2686~2696 (1999)
- Machado Neto OR, "Performance, carcass traits, meat quality and economic analysis of feedlot of young bulls fed oilseeds with and without supplementation of vitamin E", R Bras Zootec, 41, pp.1756~1763 (2012)
- H.S. Xin, "Effects of Polyurethane Coated Urea Supplement on In vitro Ruminal Fermentation, Ammonia Release Dynamics and Lactating Performance of Holstein Dairy Cows Fed a Steam-flaked Corn-based Diet", ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES, 23(4), pp.491~500 (2010), 아세아·태평양축산학회
- Santiago BT, "Slow-release urea in diets for lactating crossbred cows", R Bras Zootec, 44, pp.193~199 (2015)
- Wilson G, "Evaluation of factors responsible for reduced voluntary intake of urea diets for ruminants", J Anim Sci, 41, pp.1431~1437 (1975)
- Rennó LN, "Effects of feeding dietary urea levels on intake and total digestibility for steers of four genetic groups", R Bras Zootec, 34, pp.1775~1785 (2015)
- Highstreet A, "Response of Holstein cows to replacing urea with a slowly rumen released urea in a diet high in soluble crude protein", Livest Sci, 129, pp.179~185 (2010)
- Leng RA, "Factors affecting the utilization of ‘poor-quality’ forages by ruminants particularly under tropical conditions", Nutr Res Rev, 3, pp.277~303 (1990)
- Underwood EJ, "The Mineral Nutrition of Livestock" (1999), CABI Publishing, CAB International
- Gardinal R, "Effects of polymer coated slow-release urea on ruminal fermentation and nutrient total tract digestion of beef steers", R Bras Zootec, 45, pp.63~70 (2016)
- Benedeti PDB, "Soybean meal replaced by slow release urea in finishing diets for beef cattle", Livest Sci, 165, pp.51~60 (2014)
- Sinclair LA, "Partial replacement of soyabean meal and rapeseed meal with a slow release urea source (Optigen) and its effect on microbial growth and metabolism in vitro", British Society of Animal Science. Annual Meeting, pp.228~ (2008)
- Holder VB, "The effects of crude protein concentration and slow release urea on nitrogen metabolism in Holstein steers", Arch Anim Nutr, 67, pp.93~103 (2013)
- Alvarez Almora EG, "Effects of supplemental urea sources and feeding frequency on ruminal fermentation, fiber digestion, and nitrogen balance in beef steers", Anim Feed Sci Technol, 171, pp.136~145 (2012)
- Taylor-Edwards CC, "Effects of slow-release urea on ruminal digesta characteristics and growth performance in beef steers", J Anim Sci, 87, pp.200~208 (2009)
- Tedeschi LO, "Performance of growing and finishing cattle supplemented with a slow-release urea product and urea", Can. J Anim Sci, 82, pp.567~573 (2002)
- Bourg BM, "Effects of a slow-release urea product on performance, carcass characteristics, and nitrogen balance of steers fed steam-flaked corn", J Anim Sci, 90, pp.3914~3923 (2012)