Sadeghi Kian, Parnian-Khajehdizaj Farhad, Ganjkhanlou Mahdi, Zamanzad-Ghavidel Samad, Faraji Reza, Palangi Valiollah, Kowsar Rasoul
Department of Animal Science, Campus of Agriculture and Natural Resources, University of Tehran, Karaj, 31587-77871, Iran.
Animal Science Research Department, East Azarbaijan Agricultural and Natural Resources Research and Education Center, AREEO, Tabriz, Iran.
Sci Rep. 2024 Dec 28;14(1):31114. doi: 10.1038/s41598-024-82410-x.
The objective of this research was to examine the impact of feeding biologically treated rumen digesta (BTRD) to Holstein steer calves at levels of 0, 10, 20, and 30% (DM-based) on feed consumption, nutrient digestion, growth performance, rumen fermentation, and plasma metabolites. Sixteen Holstein steer calves with an initial BW of 113 ± 8 kg were randomly allocated in a randomized complete design. Dietary inclusion of BTRD in calves diet did not altered (P < 0.05) total intakes of DM, OM, and CP, when compared to those on the control diet over the experiment, but improved (P < 0.01) NDF and ADF consumption. Dietary inclusion of BTRD by 20% increased significantly DM and OM digestibility, average daily gain and feed efficiency (FE) (P < 0.05) and decreased feed conversion ratio (FCR) during 60 to 120 days. Plasma glucose, triglyceride, total protein, creatinine, or urea-N concentrations between treatments were not affected, but uric acid was reduced linearly (P = 0.02) in steers given BTRD supplements. Supplemented diets containing BTRD had the highest levels of plasma cholesterol and HDL, which increased with increasing BTRD inclusion levels. BTRD supplements were found to lower MDA levels in steers than control diets. This study found that dietary BTRD supplementation improved performance and health status of Holstein steer calves as well as their oxidative parameters.
本研究的目的是检验以0%、10%、20%和30%（基于干物质）的水平向荷斯坦犊牛饲喂生物处理瘤胃消化物（BTRD）对饲料消耗、养分消化、生长性能、瘤胃发酵和血浆代谢物的影响。16头初始体重为113±8千克的荷斯坦犊牛被随机分配到完全随机设计中。与实验期间的对照日粮相比，犊牛日粮中添加BTRD并未改变（P<0.05）干物质、有机物和粗蛋白的总摄入量，但提高了（P<0.01）中性洗涤纤维和酸性洗涤纤维的消耗量。日粮中添加20%的BTRD显著提高了干物质和有机物的消化率、平均日增重和饲料效率（FE）（P<0.05），并降低了60至120天期间的饲料转化率（FCR）。各处理间血浆葡萄糖、甘油三酯、总蛋白、肌酐或尿素氮浓度不受影响，但补充BTRD的犊牛血浆尿酸呈线性降低（P=0.02）。含有BTRD的补充日粮血浆胆固醇和高密度脂蛋白水平最高，且随着BTRD添加水平的增加而升高。研究发现，与对照日粮相比，BTRD补充剂可降低犊牛的丙二醛水平。本研究发现，日粮中添加BTRD可改善荷斯坦犊牛的生产性能、健康状况及其氧化参数。
