Assefa Shimelis, Duguma Belay, Worku Zemene
Department of Animal Sciences, College of Agriculture and Veterinary Medicine, Jimma University, P.O. Box 307, Jimma, Oromia, Ethiopia.
Heliyon. 2024 Jul 31;10(15):e35581. doi: 10.1016/j.heliyon.2024.e35581. eCollection 2024 Aug 15.
Evaluation of feed chemical composition is essential for predicting nutrient deficiencies and improving feed for optimal livestock productivity. However, variation in agro-ecological zones (AEZs) might affect the chemical composition of feeds. The main objective of this study was to evaluate and compare the chemical composition of major feed resources in the midland and lowland AEZs of the Majang zone in southwest Ethiopia. A total of eight representative samples of feed resources were collected from lowland (Godere district) AEZ (500-1500 m above sea level) and midland (Mangashi district) AEZ (1501-2300 m above sea level). The samples were analysed for dry matter (DM), ash, crude protein (CP), ether extract (EE), neutral detergent fibre (NDF), acid detergent fibre (ADF) and acid detergent lignin (ADL). The result revealed significant differences (p < 0.05) in the chemical composition traits between the two AEZs in the study area. For example, the DM, ash and NDF contents of were higher ( < 0.05) in the lowland AEZ, while the ADF and ADL contents were higher in the midland; had higher ( < 0.05) ADF content in the lowland, while stover had higher ( < 0.05) DM, ash and ADF contents in the lowland. stover showed higher ( < 0.05) DM, ash, ADF and ADL contents in the lowland, while had higher ( < 0.05) ash and CP contents in the lowland and higher ( < 0.05) ADF and ADL contents in the midland AEZ; Atella (a traditional alcohol byproduct) had greater ( < 0.05) ash and ADF contents in the lowland. Regardless of the AEZs, the DM, ash, NDF, ADF, EE, CP and ADL contents of the feed samples varied from 89.97 ± 0.33 % in to 92.50 ± 0.01 in Sorghum bicolor stover, 4.27 ± 0.19 in to 12.37 ± 0.42 in elephant grass, 51.66 ± 0.38 in to 66.10 ± 0.25 in , 32.21 ± 0.29 in to 42.58 ± 0.44 in , 0.63 ± 0.15 in to 2.55 ± 0.03 in 4.77 ± 0.01 in Zea mays stover to 11.83 ± 0.02 in and 10.31 ± 0.07 in Z. mays stover to 19.41 ± 0.07 % DM in , respectively. From this study it was concluded that variation in AEZ has a significant effect on chemical composition traits of the feeds in the study area. The results of the study revealed that stands out as a valuable protein source, while crop residues may require additional protein supplementation to meet livestock requirements in the study area.
评估饲料化学成分对于预测营养缺乏情况和改进饲料以实现最佳畜牧生产力至关重要。然而，农业生态区（AEZs）的差异可能会影响饲料的化学成分。本研究的主要目的是评估和比较埃塞俄比亚西南部马让地区中部和低地农业生态区主要饲料资源的化学成分。总共从低地（戈德雷区）农业生态区（海拔500 - 1500米）和中部（曼加希区）农业生态区（海拔1501 - 2300米）采集了八个具有代表性的饲料资源样本。对样本进行了干物质（DM）、灰分、粗蛋白（CP）、乙醚提取物（EE）、中性洗涤纤维（NDF）、酸性洗涤纤维（ADF）和酸性洗涤木质素（ADL）分析。结果显示，研究区域内两个农业生态区的化学成分特征存在显著差异（p < 0.05）。例如，低地农业生态区的DM、灰分和NDF含量较高（p < 0.05），而中部地区的ADF和ADL含量较高；低地的[具体名称1]的ADF含量较高（p < 0.05），而低地的[具体名称2]秸秆的DM、灰分和ADF含量较高（p < 0.05）。低地的[具体名称3]秸秆的DM、灰分、ADF和ADL含量较高（p < 0.05），而低地的[具体名称4]的灰分和CP含量较高（p < 0.05），中部农业生态区的ADF和ADL含量较高（p < 0.05）；阿特拉（一种传统酒精副产品）在低地的灰分和ADF含量较高（p < 0.05）。无论农业生态区如何，饲料样本的DM、灰分、NDF、ADF、EE、CP和ADL含量分别在[具体名称5]的89.97 ± 0.33%至双色高粱秸秆的92.50 ± 0.01%、[具体名称6]的4.27 ± 0.19%至象草的12.37 ± 0.42%、[具体名称7]的51.66 ± 0.38%至[具体名称8]的66.10 ± 0.25%、[具体名称9]的32.21 ± 0.29%至[具体名称10]的42.58 ± 0.44%、[具体名称11]的0.63 ± 0.15%至[具体名称12]的2.55 ± 0.03%、玉米秸秆的4.77 ± 0.01%至[具体名称13]的11.83 ± 0.02%以及玉米秸秆的10.31 ± 0.07%至[具体名称14]的19.41 ± 0.07% DM之间变化。从本研究得出结论，农业生态区的差异对研究区域内饲料的化学成分特征有显著影响。研究结果表明，[具体名称15]是一种有价值的蛋白质来源，而在研究区域内，作物残渣可能需要额外补充蛋白质以满足牲畜需求。
