Rothamsted Research, North Wyke, Okehampton, EX20 2SB, Devon, UK.
Alltech Bioscience Centre, Sarney, Summerhill Road, Dunboyne, Co. Meath, Ireland.
Sci Rep. 2023 Feb 16;13(1):2747. doi: 10.1038/s41598-023-29717-3.
The form (organic versus inorganic) of minerals (Se, Zn, Cu and Mn), supplemented to sheep (Charolais × Suffolk-Mule (mean weight = 57 ± 2.9 kg) at two European industrial doses, on the return of micronutrients to pasture via nutrient partitioning and composition in sheep urine and faeces was investigated. This gave four treatments in total with 6 animals per treatment (n = 24). The form of the supplemented minerals did not influence the excretory partitioning of micronutrients (Se, Zn, Cu and Mn) between urine and faeces, nor on their concentrations in the excreta. The two doses trialed however, may influence the Se flux in the environment through altering the ratios of Se:P and Se:S ratios in the faeces and Se:S ratio in the urine. Administration of the mineral supplements also improved the retention of P in sheep reducing its excretion via urine. Although the concentrations of readily bioavailable micronutrients in the faeces were not affected by the mineral forms, there were differences in the more recalcitrant fractions of Se, Zn and Cu (as inferred via a sequential extraction) in faeces when different forms of supplemental minerals were offered. The potential impact of these differences on micronutrient flux in pasture requires further investigation.
研究了在返回牧场时，通过养分分配和绵羊尿液和粪便中的组成，向绵羊（夏洛莱×萨福克-穆勒杂种（平均体重= 57 ± 2.9 公斤）补充两种欧洲工业剂量的矿物质（硒、锌、铜和锰）时，矿物质（硒、锌、铜和锰）的形式（有机与无机）对返回的微量营养素的影响。这总共给出了四种处理方法，每种处理方法有 6 只动物（n = 24）。补充矿物质的形式并没有影响微量元素（硒、锌、铜和锰）在尿液和粪便之间的排泄分配，也没有影响它们在排泄物中的浓度。然而，试验的两种剂量可能会通过改变粪便中的硒：磷和硒：硫比以及尿液中的硒：硫比来影响环境中的硒通量。施用矿物补充剂还可以提高绵羊对磷的保留率，减少其通过尿液的排泄。尽管粪便中易生物利用的微量元素浓度不受矿物形式的影响，但当提供不同形式的补充矿物质时，粪便中硒、锌和铜的更顽固部分（如通过顺序提取推断）存在差异。这些差异对牧场中微量营养素通量的潜在影响需要进一步研究。
