Dipartimento di Agraria, Sezione di Scienze Zootecniche, Università degli studi di Sassari, Viale Italia 39, 07100 Sassari, Italy.
Department of Animal Science, Laboratory of Nutritional Physiology and Feeding, Agricultural University of Athens, Iera Odos 75, GR-11855 Athens, Greece.
Animal. 2022 Apr;16(4):100501. doi: 10.1016/j.animal.2022.100501. Epub 2022 Apr 1.
Spent coffee ground (SCG) is a byproduct of coffee beverage preparation and a potential source of carbohydrate, protein, and phenolic compounds for livestock feeding. In this study, the effects of SCG supplementation in the diet of lactating goats on milk production traits and health status were studied. The antioxidant status of blood and milk was also evaluated. Twenty-four Saanen goats were fed a total mixed ration containing commercial concentrate, soybean, and haylage; they were divided into three groups: control diet (CON), SCG50 (50 g/d SCG), and SCG100 (100 g/d SCG). The experiment lasted 6 weeks. Linear and quadratic contrasts were used to evaluate the effects of the byproduct doses. SCG supplementation did not affect milk production, but influenced some milk fatty acids. SCG supplementation increased the contents of C18:1, cis-9, trans-11 C18:2, odd and branched-chain fatty acids, and total conjugated linoleic acid. Most of the haematological and biochemical parameters were within the physiological range for goats. The basophil, eosinophil, and glucose contents were quadratically affected by SCG, whereas platelet count increased linearly with the SCG dose. The SCG supplementation had a positive effect on the blood antioxidant status, as evidenced by an increase in ferric reducing antioxidant power and a decrease in malondialdehyde. The SCG supplementation had no effect on the milk antioxidant status. The results show that SCG (up to 100 g/d) did not negatively affect milk production and health status in goats. However, quadratic effects on some antioxidant and biochemical parameters suggest that further investigations are necessary, especially with regard to the optimisation of the supplement dose.
废咖啡渣（SCG）是咖啡饮料制备的副产品，也是牲畜饲料中碳水化合物、蛋白质和酚类化合物的潜在来源。本研究探讨了在泌乳山羊日粮中添加 SCG 对产奶性能和健康状况的影响。还评估了血液和牛奶的抗氧化状态。24 只萨能奶山羊饲喂含有商业浓缩饲料、大豆和青贮饲料的全混合日粮，分为三组：对照组（CON）、SCG50（50g/d SCG）和 SCG100（100g/d SCG）。实验持续 6 周。线性和二次对比用于评估副产物剂量的影响。SCG 补充剂不影响产奶量，但影响一些牛奶脂肪酸。SCG 补充剂增加了 C18:1、顺-9、反-11 C18:2、奇数和支链脂肪酸以及总共轭亚油酸的含量。大多数血液学和生化参数均在山羊的生理范围内。嗜碱性粒细胞、嗜酸性粒细胞和葡萄糖含量受 SCG 的二次影响，而血小板计数随 SCG 剂量呈线性增加。SCG 补充剂对血液抗氧化状态有积极影响，表现为铁还原抗氧化能力增加，丙二醛减少。SCG 补充剂对牛奶抗氧化状态没有影响。结果表明，SCG（高达 100g/d）不会对山羊的产奶量和健康状况产生负面影响。然而，对一些抗氧化和生化参数的二次影响表明，需要进一步研究，特别是要优化补充剂量。
