Schryver H F, Oftedal O T, Williams J, Soderholm L V, Hintz H F
J Nutr. 1986 Nov;116(11):2142-7. doi: 10.1093/jn/116.11.2142.
Changes in the mineral composition of mare milk during lactation were studied. Milk samples were obtained from five Thoroughbred mares one to three times weekly from the first to the eighth week of lactation and from two of the mares for an additional 8 wk. Samples averaging 500 mL were obtained after oxytocin was administered to the mares. Each sample was analyzed for total solids, ash, calcium, phosphorus, magnesium, sodium, potassium, copper and zinc. The concentration of all constituents except sodium and potassium decreased throughout lactation. The rates of decline of ash, calcium, phosphorus and magnesium concentration were similar, but the rates of decline of the other elements differed. Thus, the mineral composition of mare milk should be described in terms of the stage of lactation of the mare. The total solids and ash content of mare milk were 12 and 0.61% respectively, at the end of the first week of lactation, 10.5 and 0.45% at 4 wk, 10 and 0.38% at 8 wk and 10.2 and 0.32% at 16 wk. The calcium, phosphorus and magnesium concentrations at the end of the same periods were 1345, 943 and 118 micrograms/g of milk at 1 wk; 1070, 659 and 86 at 4 wk; 831, 574 and 58 at 8 wk and 700, 540 and 43 micrograms/g of milk at 16 wk. Copper and zinc concentrations were 0.85 and 3.1, 0.55 and 2.2, 0.29 and 1.9 and 0.28 and 1.8 microgram/g of milk at 1, 4, 8 and 16 wk, respectively.
研究了哺乳期母马乳汁中矿物质成分的变化。在哺乳期的第1至8周，每周从5匹纯种母马中采集1至3次乳汁样本，其中2匹母马的样本采集时间延长至额外的8周。向母马注射催产素后采集平均500毫升的样本。对每个样本分析总固体、灰分、钙、磷、镁、钠、钾、铜和锌。除钠和钾外，所有成分的浓度在整个哺乳期都有所下降。灰分、钙、磷和镁浓度的下降速率相似，但其他元素的下降速率不同。因此，母马乳汁的矿物质成分应根据母马的哺乳期阶段来描述。哺乳期第1周结束时，母马乳汁的总固体和灰分含量分别为12%和0.61%，4周时为10.5%和0.45%，8周时为10%和0.38%，16周时为10.2%和0.32%。同期结束时，每克乳汁中的钙、磷和镁浓度在1周时分别为1345、943和118微克；4周时为1070、659和86微克；8周时为831、574和58微克；16周时为700、540和43微克。铜和锌的浓度在1、4、8和16周时分别为0.85和3.1、0.55和2.2、0.29和1.9以及0.28和1.8微克/克乳汁。
