The objective of this study was to evaluate the effect of maize (Zea mays L.) carbohydrate contents and the estimates of milk production on different storage periods. The experimental design was completely randomised, with four treatments (storage time), each replicated four times. We observed a reduction in non-fibrous carbohydrates and an increase in the fibrous fraction, whereas starch plus soluble fibres (B1) showed a quadratic behaviour. As for the degradation kinetic parameters of the silages, an increase in gas production and degradation rate (B) was observed, whereas the fraction (A) decreased; the other parameters were not affected by the lengthening of storage time. The dietary simulation showed a reduction in protein, metabolisable energy and average daily gain (ADG), requiring more storage time to gain a point in the body condition score. The in vitro digestibility of dry matter (IVDMD) and total digestible nutrients (TDN) showed quadratic responses, whereas the digestibility of neutral detergent fibre and the milk production estimates were not affected by the storage time of maize silages. It is recommended to store maize silages for up to 221 days, because after this period there is a reduction in the digestibility of silages.

本研究的目的是评估玉米 ( Zea maysL.) 碳水化合物含量和不同储存期的牛奶产量估计。实验设计是完全随机的，有四种处理（储存时间），每种处理重复四次。我们观察到非纤维碳水化合物的减少和纤维部分的增加，而淀粉加可溶性纤维 (B1) 显示出二次行为。至于青贮饲料的降解动力学参数，观察到产气量和降解率 (B) 增加，而分数 (A) 减少；其他参数不受贮存时间延长的影响。饮食模拟显示蛋白质、可代谢能量和平均日增重 (ADG) 减少，需要更多的储存时间才能在身体状况评分中获得分数。体外_干物质消化率 (IVDMD) 和总可消化营养素 (TDN) 呈二次响应，而中性洗涤纤维的消化率和牛奶产量估计值不受玉米青贮饲料储存时间的影响。建议将玉米青贮饲料储存最多 221 天​​，因为在此之后，青贮饲料的消化率会降低。