Good Clinical Practice Research Centre, The University of Queensland, School of Veterinary Science, Gatton, Queensland 4343, Australia.
Terragen Biotech Pty Ltd., Coolum Beach, Queensland 4573, Australia.
J Dairy Sci. 2019 Mar;102(3):2188-2195. doi: 10.3168/jds.2018-15411. Epub 2019 Jan 11.
Probiotics intended to improve plant health and productivity of pastures grazed by dairy cow are becoming commercially available in Australia. Great Land (GL; Terragen Biotech Pty Ltd., Coolum Beach, QLD, Australia) is one such biologic soil conditioner and spray-on probiotic with a label claim of "acting to improve plant health and productivity." The objective of this study was to quantify the effect of GL on the milk quality of cows grazing pasture top-dressed with GL. Lactating dairy cows of mixed age and breed (primarily Holstein-Friesian), in their second lactation or greater, and at least 80 d in milk were enrolled and randomly allocated into 1 of 2 study groups: a treatment cow group (n = 98; cows grazed pasture that was top-dressed with GL according to the product label) and a control cow group (n = 114; cows grazed untreated pasture). As required, both groups were supplemented at the same rate with a mixed ration during the grazing period. Composite milk samples were collected weekly from each cow during the study and analyzed to determine milk components. Milk volumes were recorded at each milking using the herd management software of the study farm. Mean differences in the milk component variables were compared using mixed-effects linear regression models. After controlling for the effect of days in milk, cow lactation, and time since a cow entered the study, the treatment cows produced an average of 1.21 L/cow per day more milk (95% confidence interval: 0.34-2.08 L/cow per day) and more milk protein (0.03 kg/d; 95% confidence interval: 0.01-0.05 kg/d) than the control cows. Pasture cover and pasture consumption did not differ between the GL-treated and the untreated study paddocks grazed by the treatment or control cows. A limited amount of published data have examined the effect of probiotic pasture treatment on the milk quality of dairy cows. This study suggests that application of such products may be beneficial. The mechanisms associated with this type of outcome remain to be investigated.
旨在改善奶牛牧场植物健康和生产力的益生菌在澳大利亚正逐渐商业化。Great Land（GL；Terragen Biotech Pty Ltd.，昆士兰州库鲁姆海滩）是一种生物土壤调节剂和喷雾益生菌，其标签声称“有助于改善植物健康和生产力”。本研究的目的是量化 GL 对放牧 GL 追肥牧场奶牛牛奶质量的影响。混合年龄和品种（主要是荷斯坦-弗里森）的泌乳奶牛，处于第二次泌乳或更高阶段，并且至少有 80 天的泌乳期，被招募并随机分配到 2 个研究组之一：治疗奶牛组（n = 98；奶牛放牧 GL 追肥的牧场根据产品标签）和对照奶牛组（n = 114；奶牛放牧未处理的牧场）。如需要，两组在放牧期间以相同的速度用混合日粮补充。在研究期间每周从每头奶牛收集混合牛奶样本并进行分析以确定牛奶成分。使用研究农场的 herd management software 记录每次挤奶的牛奶量。使用混合效应线性回归模型比较牛奶成分变量的平均差异。在控制牛奶天数、奶牛泌乳和奶牛进入研究的时间的影响后，治疗奶牛每天产奶量平均增加 1.21 升/头（95%置信区间：0.34-2.08 升/头），牛奶蛋白增加 0.03 千克/天（95%置信区间：0.01-0.05 千克/天）比对照奶牛多。GL 处理和未处理的研究围场中放牧的治疗和对照奶牛的牧场覆盖率和牧场消耗量没有差异。有限的已发表数据研究了益生菌牧场处理对奶牛牛奶质量的影响。本研究表明，应用此类产品可能是有益的。与这种结果相关的机制仍有待研究。
