摘要
The objectives of this study were to determine the effects of using different buffer sources and monensin on total tract apparent digestibility of nutrients and ruminal constituents of feedlot lambs fed high grain diets. Twenty-four lambs cannulated in the rumen were used in a randomized complete block design. Animals were fed diets containing 90% concentrate and 10% hay with addition of two limestone sources of different particle sizes and sodium bicarbonate, with or without monensin addition. Experimental treatments were arranged in a 2 × 3 factorial, with two monensin (0 or 30 mg/kg of diet) and three buffers: L = 1.3% limestone; FL = 1.3% filler limestone, and L + SB = 1.3% limestone + 1% sodium bicarbonate (DM basis). Dry matter, organic matter and crude protein digestibilities were higher (P < 0.05) for animals fed FL, when compared to other buffer treatments. Similarly, NDF digestibility was higher (P < 0.01) for treatments containing monensin compared to treatments without monensin. There were no differences in ruminal pH, water intake, ruminal acetate:propionate, and ruminal butyrate concentration. There was an interaction (P < 0.05) between FL and monensin addition for ruminal NH3-N, VFA, acetate, and propionate concentrations. Concentrations of these two VFA were lower (P < 0.05) when the ionophore was added. There was an interaction between the L + SB and monensin for total VFA (P < 0.01), acetate (P < 0.01), and propionate (P < 0.05) concentrations, with lower (P < 0.05) concentrations in treatments without monensin. The use of FL improved digestibility of DM, and it may be used in feedlot systems in which high concentrate diets are fed to lambs; however, the cost of this product in relation to limestone should be considered. Monensin increased NDF digestibility, as well as showed a positive interaction with FL and sodium bicarbonate; therefore, the use of monensin is recommended in high concentrate diets for finishing lambs.
摘要译文
他的研究是为了确定使用不同的缓冲源和莫能菌素对养分和饲喂高谷物饲料育肥羔羊瘤胃成分的总消化道表观消化率的影响。插管在瘤胃二十四羔羊在一个随机完全区组设计中使用。动物喂含90％浓缩物和10％的干草并加入不同粒径和碳酸氢钠，有或没有莫能菌素加入两种石灰石源饮食。实验处理被安排在一个2×3因子，具有两个莫能菌素（0或30mg / kg饲料）和三个缓冲器L \x3d 1.3％的石灰石; FL \x3d 1.3％的填料石灰石，和L SB \x3d 1。3％的石灰石1％碳酸氢钠（干物质为基础）。干物质，有机物和粗蛋白消化率较高（P同样，NDF的消化率较高（P瘤胃醋酸：丙酸，和瘤胃丁酸浓度。有一个交互作用（P和丙酸浓度。这两个VFA的浓度较低（P01），乙酸（P并且它可以在饲养场系统，其中高浓缩物日粮被送入羊羔使用;然而，这种产品就石灰石的成本应该加以考虑。莫能菌素增加NDF的消化率，以及表现出与FL和碳酸氢钠的良性互动;因此，使用莫能菌素，建议在高精料日粮整理羔羊。
A.L. Gastaldello Jr.[a]; A.V. Pires[a]; I. Susin[a]; C.Q. Mendes[b]; M.A.A. Queiroz[c]; R.C. Amaral[a]; R.S. Gentil[a]; E.M. Ferreira[d]; G.B. Mourão[a]; M.L. Eastridge[e]. Limestone with different particle size and sodium bicarbonate to feedlot lambs fed high grain diets with or without monensin[J]. Small Ruminant Research, 2013,114(1): 80–85