Department of Animal Sciences, University of Florida, Gainesville 32611, USA.
J Anim Sci. 2010 Jun;88(6):2055-61. doi: 10.2527/jas.2009-2092. Epub 2010 Feb 12.
Mature horses were used to determine apparent DM, OM, NDF, and CP digestibility values of 2 bermudagrass (BG; Cynodon dactylon) hays, Coastal (CB) and Tifton 85 (T85), and Florigraze perennial peanut (PP; Arachis glabrata) hay. In addition, N, Ca, and P balances were determined in horses fed those hays. Five mature Thoroughbred geldings and 1 Quarter Horse gelding (mean initial BW = 542 +/- 37 kg) were used (5 horses for the last period) in a 3 x 3 repeated Latin square design, with 2 horses per hay and 3 adjustment and collection periods. Horses were randomly assigned to pairs and the initial hay to be fed. Each period consisted of a 10-d adjustment phase, followed by a 4-d total fecal and urine collection phase. Horses were fed at 1.5 (period 1), 1.7 (period 2), or 2% (period 3) of their BW daily (DM basis). The 2 BG were grown under similar conditions, with CB and T85 being cut at 4 and 5 wk of regrowth, respectively, and PP being of a late first cutting. The compositions (DM basis) of PP, CB, and T85, respectively, were 93, 94, and 93% DM; 92, 94, and 94% OM; 46, 73, and 77% NDF; 34, 37, and 42% ADF; 11, 10, and 8% CP; 1.10, 0.28, 0.27% Ca; and 0.19, 0.15, and 0.19% P, respectively. Least squares means (pooled SE) for apparent digestibility of PP, CB, and T85, respectively, were 65, 53, and 52% (1) DM digestibility; 67, 53, and 52% (1) OM digestibility; 44, 50, and 46% (4) NDF digestibility; and 66, 60, and 57% (1) CP digestibility. Digestibility values of DM and OM were greater (P < 0.001) for PP than for the BG. Digestibility of CP was greater (P = 0.001) for PP than for CB or T85, with no difference (P = 0.37) between PP and BG hays in NDF digestibility. There were no differences between CB and T85 for DM digestibility (P = 0.67), OM digestibility (P = 0.59), CP digestibility (P = 0.11), and NDF digestibility (P = 0.48). Nitrogen (P = 0.01) and P balances (P = 0.04) were greater for PP than BG hays, whereas N balance of CB was greater (P = 0.01) than that of T85. There were no differences among all hays in Ca balance (P = 0.54) and between the BG in P balance (P = 0.34). Results indicated that PP, CB, and T85 are suitable forages for horses.
使用成熟马来确定 2 种百喜草(Cynodon dactylon)干草,沿海(CB)和蒂夫顿 85(T85)以及佛罗里格雷斯多年生花生(Arachis glabrata)干草的表观 DM、OM、NDF 和 CP 消化率值。此外,还确定了马对这些干草的氮、钙和磷平衡。5 匹成熟的纯血马和 1 匹夸特马(平均初始 BW = 542 +/- 37 kg)在 3 x 3 重复拉丁方设计中使用(最后一个周期为 5 匹马),每匹马有 2 匹马和 3 个调整和收集期。马被随机分配到对中,并提供最初要喂的干草。每个周期由 10 天的调整期和 4 天的总粪便和尿液收集期组成。马以其 BW 的 1.5%(第 1 期)、1.7%(第 2 期)或 2%(第 3 期)(DM 基础)进行喂养。2 种 BG 在相似条件下生长,CB 和 T85 分别在再生的第 4 和第 5 周收割,而 PP 则是第一次收割的后期。PP、CB 和 T85 的组成(DM 基础)分别为 93、94 和 93% DM;92、94 和 94% OM;46、73 和 77% NDF;34、37 和 42% ADF;11、10 和 8% CP;1.10、0.28 和 0.27% Ca;和 0.19、0.15 和 0.19% P。PP、CB 和 T85 的表观消化率的最小二乘平均值(合并 SE)分别为 65%、53%和 52%(1)DM 消化率;67%、53%和 52%(1)OM 消化率;44%、50%和 46%(4)NDF 消化率;和 66%、60%和 57%(1)CP 消化率。与 BG 相比,PP 的 DM 和 OM 消化率更高(P < 0.001)。PP 的 CP 消化率高于 CB 或 T85(P = 0.001),而 PP 与 BG 干草之间的 NDF 消化率无差异(P = 0.37)。CB 和 T85 之间的 DM 消化率(P = 0.67)、OM 消化率(P = 0.59)、CP 消化率(P = 0.11)和 NDF 消化率(P = 0.48)无差异。与 BG 干草相比,PP 的氮(P = 0.01)和磷平衡(P = 0.04)更大,而 CB 的氮平衡大于 T85(P = 0.01)。所有干草之间的钙平衡(P = 0.54)和 BG 之间的磷平衡(P = 0.34)没有差异。结果表明,PP、CB 和 T85 是适合马的饲料。