Bekele Wondimagegne, Kassa Getachew, Taddes Teklewold, Girma Muluken, Mengistu Alemayehu, Assefa Getnet
Debre Berhan University, P.O. Box 445, Ethiopia.
Gent University, St. Pietersniewstrat 33, 9000 Gent, Belgium.
Heliyon. 2022 Aug 10;8(8):e10181. doi: 10.1016/j.heliyon.2022.e10181. eCollection 2022 Aug.
This research was conducted to evaluate the replacement potential of nilotica dried leaf meal for Noug Seed Cake (NSC) to supplement low quality grass hay in the diet of crossbred sheep (25% Dorper). In doing so, four treatments were set up in such a way that 0%, 33%, 67%, and 100% NSC is replaced with dried leaf of nilotica from a conventional supplement while the treatments were kept isonitrogenous. The experiment was set up in a Randomized Complete Block Design, with initials weight used as the blocking factor. Twenty animals were allocated to the four treatments. The experiment consisted of hundred days of feeding trial followed by evaluation of carcass components at the end. In addition, the experimental feed ingredient was studied for gas production, methane (CH) production, fractional rate of degradation (Kd), and dry matter digestibility (IVDMD). In view of chemical composition, grass hay contained lower crude protein (CP = 3.2% DM) and high cell wall contents that makes it lower quality feed. On the other hand, leaf meal was moderate in quality (CP = 14.3% DM) that can support moderate level of ruminant production. In an study, nilotica was found to have lower (P < 0.01) levels of CH, total gas, kd, and IVDMD compared to the other feed ingredients. This indicates that tannin have an effect on nilotica feed. Partial and complete replacement of NSC with nilotica leaf meal significantly increased total dry matter intake (TDMI) (P < 0.001). Average daily gain (ADG) and dressing percentage was also higher for leaf meal supplemented groups. Hot carcass weight was in the range of 14.8-17.8 kg, which is higher than the national average carcass weight for Ethiopian sheep, and it was also found to be higher when NSC was partially (33%) as well as completely replaced by the leaf meal. In general, NSC can be replaced either partially or completely with leaf meal in the diet of 25% Dorper crosses while weight gain as well as carcass yield is promoted. The maximum inclusion level of nilotica was 61.3% or 319.2 g per day for 25% Dorper cross sheep fed natural pasture hay as a basal diet.
本研究旨在评估尼罗罗非鱼干叶粉替代诺格籽饼（NSC）以补充杂种绵羊（25%杜泊羊）日粮中低质量禾本科干草的潜力。为此，设置了四种处理方式，将传统补充料中的NSC分别以0%、33%、67%和100%的比例用尼罗罗非鱼干叶替代，同时各处理保持等氮水平。试验采用随机完全区组设计，以初始体重作为区组因素。将20只动物分配到四种处理组。试验包括为期100天的饲养试验，最后评估胴体组成。此外，还对试验饲料原料进行了产气、甲烷（CH）产生、降解率（Kd）和干物质消化率（IVDMD）的研究。从化学成分来看，禾本科干草粗蛋白含量较低（CP = 3.2%干物质）且细胞壁含量高，使其成为低质量饲料。另一方面，叶粉质量中等（CP = 14.3%干物质），能够支持中等水平的反刍动物生产。在一项研究中，发现尼罗罗非鱼的CH、总气体、Kd和IVDMD水平低于其他饲料原料（P < 0.01）。这表明单宁对尼罗罗非鱼饲料有影响。用尼罗罗非鱼叶粉部分或完全替代NSC显著提高了总干物质摄入量（TDMI）（P < 0.001）。补充叶粉组的平均日增重（ADG）和屠宰率也更高。热胴体重在14.8 - 17.8千克之间，高于埃塞俄比亚绵羊的全国平均胴体重，并且当NSC被叶粉部分（33%）和完全替代时，热胴体重也更高。总体而言，在25%杜泊羊杂交种的日粮中，NSC可以被叶粉部分或完全替代，同时促进体重增加和胴体产量。以天然牧场干草为基础日粮喂养的25%杜泊羊杂交种，尼罗罗非鱼的最大添加水平为61.3%或每天319.2克。
