Livestock Research Department, Arid Lands Cultivation Research Institute, City of Scientific Research and Technological Applications, Alexandria, Egypt.
Department of Animal and Fish Production, Faculty of Agriculture, University of Alexandria, Alexandria, Egypt.
Anim Biotechnol. 2023 Nov;34(4):935-946. doi: 10.1080/10495398.2021.2003806. Epub 2021 Nov 13.
Two and experiments were accomplished to investigate the impacts of integrated feed additives (IFA, combination of protected fat, lysine, and methionine plus yucca extract, eucalyptus essential oil, and direct-fed microbial) on gas production (GP), ruminal fermentation and degradability parameters and lamb performance, digestibility, and nitrogen balance. In the experiment, responses of graded doses (0, 25, 50, 75, 100, and 125 g IFA/kg DM) were evaluated. In the experiment, 15 Barki male lambs (30.43 ± 0.74 kg BW ± SE) were individually allotted in complete randomized design into three treatments (five animal/treatment) as control (basal diet without additive), low dose (50 g/kg DM) and high dose (100 g/kg DM) for 120 days. results showed that both doses (100 and 125 g/kg DM) quadratically decreased ( < 0.001) GP and ammonia nitrogen (NH-N) concentration. experiment revealed that dry matter intake was increased ( = 0.016) with low dose compared to high dose. Inclusion of high dose decreased blood serum glucose concentrations ( > 0.05) and ruminal protozoal populations ( = 0.094) compared with low dose and control diet. Both doses of IFA increased ( < 0.05) serum urea, creatinine, and triglyceride concentrations, while decreased ( < 0.001) ruminal NH-N concentrations. These results suggested that, although IFA was effective to modify ruminal fermentation process and feed degradability, such aspects did not improve performance of growing lambs.
进行了两项实验，以研究综合饲料添加剂（IFA，由保护脂肪、赖氨酸和蛋氨酸与丝兰提取物、桉树精油和直接饲喂微生物组成）对产气量（GP）、瘤胃发酵和降解参数以及羔羊性能、消化率和氮平衡的影响。在实验中，评估了不同剂量（0、25、50、75、100 和 125 g IFA/kg DM）的反应。在实验中，将 15 只 Barki 雄性羔羊（30.43±0.74 kg BW±SE）单独分配到完全随机设计的三个处理中（每个处理五个动物）：对照组（不含添加剂的基础日粮）、低剂量（50 g/kg DM）和高剂量（100 g/kg DM），为期 120 天。结果表明，两个剂量（100 和 125 g/kg DM）均二次降低（ < 0.001）了产气量和氨氮（NH-N）浓度。实验表明，与高剂量相比，低剂量增加了干物质采食量（ = 0.016）。与低剂量和对照组相比，高剂量组的血清葡萄糖浓度（ > 0.05）和瘤胃原虫数量（ = 0.094）降低。IFA 的两个剂量均增加（ < 0.05）了血清尿素、肌酐和甘油三酯浓度，同时降低（ < 0.001）了瘤胃 NH-N 浓度。这些结果表明，尽管 IFA 有效调节了瘤胃发酵过程和饲料降解性，但这些方面并没有提高生长羔羊的性能。
