Abstract Microalgae, have gained significant attention as a source of beneficial biomolecules such as long chain n-3 polyunsaturated fatty acid (PUFA), and are considered to be an effective strategy to enhance ruminant milk with PUFA. However, milk fatty acids (FA) profile is affected by ruminant biohydrogenation process and consequently by possible adaptations of rumen microbiome related with the duration of diet supplementation. Thus, the aim of the present study was to investigate a long-term response of dietary inclusion of microalgae Schizochytrium sp., at three different levels with moderate forage to concentrate ratio (50/50) on milk chemical composition and fatty acid profile of both goats’ blood plasma and milk. For this purpose, twenty-four dairy goats were divided into four homogeneous sub-groups. All the goats were fed individually with alfalfa hay and concentrates. The concentrates of the control group (CON) had no microalgae, while those of the treated groups were supplemented daily with 20 (ALG20), 40 (ALG40) and 60 (ALG60) g Schizochytrium sp./kg concentrates. The mean milk yield was not affected, while the fat content was decreased in ALG40 and ALG60 groups, compared with the CON and ALG20 ones. In blood plasma the proportions of C16:0, C18:0, cis-9 C18:1 and C18:2n6c decreased (P

中文翻译：

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裂殖壶菌属的膳食补充水平的影响。关于山羊血浆和牛奶的牛奶化学成分和脂肪酸谱

摘要 微藻作为长链 n-3 多不饱和脂肪酸 (PUFA) 等有益生物分子的来源受到了极大的关注，被认为是用 PUFA 增强反刍动物乳汁的有效策略。然而，乳脂肪酸 (FA) 谱受反刍动物生物氢化过程的影响，因此受与日粮补充持续时间相关的瘤胃微生物组可能的适应性影响。因此，本研究的目的是研究饮食中包含微藻裂殖壶菌属的长期反应，在三种不同水平下，中等粗饲料与浓缩物的比例 (50/50) 对两者的牛奶化学成分和脂肪酸谱的影响山羊的血浆和牛奶。为此，将 24 只奶山羊分为四个同质亚组。所有的山羊都单独饲喂苜蓿干草和浓缩物。对照组 (CON) 的浓缩物没有微藻，而处理组的浓缩物每天补充 20 (ALG20)、40 (ALG40) 和 60 (ALG60) g Schizochytrium sp./kg 浓缩物。与CON组和ALG20组相比，ALG40组和ALG60组的平均产奶量没有受到影响，而脂肪含量降低。在血浆中，C16:0、C18:0、cis-9 C18:1 和 C18:2n6c 的比例降低（P 与 CON 和 ALG20 相比。在血浆中，C16:0、C18:0、cis-9 C18:1 和 C18:2n6c 的比例降低（P 与 CON 和 ALG20 相比。在血浆中，C16:0、C18:0、cis-9 C18:1 和 C18:2n6c 的比例降低（P