Glucevic Cinthya, Ghavipanje Navid, Robles-Jimenez Lizbeth E, Radic-Schilling Sergio, Gonzalez Ronquillo Manuel
Departamento de Ciencias Agropecuarias y Acuícolas, Universidad de Magallanes, Punta Arenas 6200000, Chile.
Department of Animal Science, Faculty of Agriculture, University of Birjand, Birjand 97175-331, Iran.
Animals (Basel). 2025 Jul 4;15(13):1976. doi: 10.3390/ani15131976.
Two experiments were carried out to evaluate the inclusion impacts of macroalgae (Gs) for grazing sheep. Experiment (Exp.) 1 studied the effect of Gs on in vitro gas production (IVGP), dry matter (DM) digestibility (IVDMD), and methane (CH) emission using three fistulated sheep and 96 h incubation of samples. In Exp. 2, ten Dohne Merino ewes [5-year-old; 47 ± 0.14 kg body weight (BW)] were randomly assigned to dietary treatments supplemented with Gs at 0 or 450 g DM/d per animal. The study lasted 31 days and was preceded by an adaptation period of 9 days. The BW, body conditional score (BCS), and blood were sampled at the first and the last day of the trial. The results of Exp. 1 showed that Gs supplementation reduced (MCP, = 0.026) gas production (A), lag time ( = 0.013), and IVDMD ( = 0.071), while it enhanced partition factor (PF96; = 0.004) and microbial crude protein (MCP) ( = 0.054). The concentration of CH decreased after 3 h ( = 0.0002), 6 h ( = 0.013), and 12 h ( = 0.010) with a tendency at 9 h ( = 0.109) and 24 h ( = 0.068). In Exp. 2, there were no diet effects on the initial BW (IBW, = 0.77), final BW (FBW, = 0.91), and average daily gain (ADG, = 0.24) of ewes; however, Gs supplementation decreased BCS ( = 0.004). Of all blood parameters, only the concentration of glucose ( = 0.021) and albumin ( = 0.011) decreased in the Gs group. Overall, our results revealed that the dietary inclusion of Gs (at 450 g DM/d) affected neither the BW nor ADG of ewes; however, Gs was accompanied by lesser IVGP and CH emission.
进行了两项试验以评估大型海藻（Gs）对放牧绵羊的添加影响。试验1使用三只安装了瘤胃瘘管的绵羊，对样品进行96小时培养，研究了Gs对体外产气（IVGP）、干物质（DM）消化率（IVDMD）和甲烷（CH）排放的影响。在试验2中，将十只多内美利奴母羊（5岁；体重47±0.14千克）随机分配到日粮处理组，每只动物每天补充0或450克DM的Gs。研究持续31天，之前有9天的适应期。在试验的第一天和最后一天采集体重、体况评分（BCS）和血液样本。试验1的结果表明，添加Gs降低了（MCP， = 0.026）产气（A）、滞后时间（ = 0.013）和IVDMD（ = 0.071），而提高了分配因子（PF96； = 0.004）和微生物粗蛋白（MCP）（ = 0.054）。3小时（ = 0.0002）、6小时（ = 0.013）和12小时（ = 0.010）后CH浓度降低，9小时（ = 0.109）和24小时（ = 0.068）时有降低趋势。在试验2中，日粮对母羊的初始体重（IBW， = 0.77）、最终体重（FBW， = 0.91）和平均日增重（ADG， = 0.24）没有影响；然而，添加Gs降低了BCS（ = 0.004）。在所有血液参数中，Gs组只有葡萄糖浓度（ = 0.021）和白蛋白浓度（ = 0.011）降低。总体而言，我们的结果表明，日粮中添加Gs（每天450克DM）对母羊的体重和ADG均无影响；然而，Gs伴随着较低的IVGP和CH排放。
