Johnson L J, Cross D L, Jenkins T C, Khalilan A, Redmond L M
Clemson University, SC 29634-0361.
J Anim Sci. 1991 Jun;69(6):2608-16. doi: 10.2527/1991.6962608x.
Two studies evaluated the effects of ammonium carbamate (AC) on preservation and digestibility of high-moisture (HM) Coastal bermudagrass (Cynodon dactylon) hay. A 3 X 7 factorial arrangement of treatments in a completely random design was used to estimate the efficacy of AC in laboratory conditions. Treatments were 25, 30, or 35% moisture (M) forage treated with levels (L) of 0, 1.14, 2.28, 3.42, 4.56, 5.70, or 6.84% AC. Nitrogen in forage increased (P less than .01) linearly due to M and L. There was a linear decrease (P less than .01) in ADF N due to M. Neutral detergent fiber decreased (P less than .01) linearly as M increased and increased (P less than .01) linearly with increased L. Acid detergent fiber decreased (P less than .01) linearly due to L. There was an M X L interaction (P less than .01) for hemicellulose (HC) concentrations and total aerobic fungal counts. The digestibility of HM hay treated with a product (ACNH) containing 57% AC was compared to that of untreated hay (UH) and UH plus urea (UHU) when fed to lambs (four lambs per treatment). Digestibility of NDF and hemicellulose (P less than .01) and ADF (P less than .05) was increased for ACNH forage compared with UH or UHU. Ammonium carbamate seems to be beneficial for preserving HM forage, and an admixture containing ammonium carbamate is effective for increasing the digestibility of Coastal bermudagrass hay.
两项研究评估了氨基甲酸铵（AC）对高水分（HM）海滨雀稗（狗牙根）干草保存和消化率的影响。采用完全随机设计的3×7析因处理排列方式，在实验室条件下估计AC的功效。处理方式为水分含量（M）分别为25%、30%或35%的草料，分别用0%、1.14%、2.28%、3.42%、4.56%、5.70%或6.84%的AC水平（L）进行处理。由于水分含量和AC水平，草料中的氮含量呈线性增加（P＜0.01）。由于水分含量增加，酸性洗涤纤维氮含量呈线性下降（P＜0.01）。中性洗涤纤维随着水分含量增加呈线性下降（P＜0.01），随着AC水平增加呈线性增加（P＜0.01）。由于AC水平，酸性洗涤纤维呈线性下降（P＜0.01）。半纤维素（HC）浓度和总需氧真菌数量存在水分含量×AC水平的交互作用（P＜0.01）。将含有57%AC的产品（ACNH）处理的HM干草与未处理的干草（UH）和未处理干草加尿素（UHU）喂给羔羊（每个处理4只羔羊）时的消化率进行比较。与UH或UHU相比，ACNH草料的中性洗涤纤维和半纤维素消化率（P＜0.01）以及酸性洗涤纤维消化率（P＜0.05）有所提高。氨基甲酸铵似乎有利于保存HM草料，且含有氨基甲酸铵的混合物可有效提高海滨雀稗干草的消化率。
