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Production Responses of Lactating Dairy Cows Fed Silage-Based Diets to Changes in Nutrient Supply

机译:哺乳酸奶牛的生产响应喂养青贮饲料饮食以改变营养供应

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Dairy cow ration formulation and economical optimization are facing several challenges within the current EU market. First, fluctuation of the prices of feed components (grain and protein feeds) and milk has increased in the current market conditions.Traditionally, ration formulation systems have been based on static feed values and standard feeding recommendations, whereas the target in optimization is to formulate a least-cost ration to sustain a fixed production level. However, with variable feedcosts and milk prices this approach seldom maximizes the margin over feed cost, i.e. the optimal solution may be higher or lower feeding intensity than the average recommendations. It is also well established that in addition to metabolisable energy (ME) and protein (MP) intake other nutrients, such as fat and carbohydrates, can modify the composition of absorbed nutrients, milk yield and composition (Hristov, Price and Shafii, 2005). For optimization of the margin over feed costs within a herd, accurate prediction of marginal production responses to changes in nutrient supply is more important than predicting actual production levels (Hulme, Kellaway and Booth, 1986).
机译:奶牛配方配方和经济优化面临当前欧盟市场内的几个挑战。首先,在当前的市场条件下,饲料组分(谷物和蛋白质饲料)和牛奶的价格波动增加了。,目前的市场条件增加了,配方制剂系统一直基于静态馈送值和标准喂养建议,而优化中的目标是制定保持固定生产水平的最低成本优惠。然而,随着可变的给药和牛奶价格,这种方法很少能够通过饲料成本最大化边距,即最佳解决方案可能比平均建议更高或更低的饲料强度。还建立了,除了代谢能量(ME)和蛋白质(MP)摄入其他营养素之外,还可以改变吸收的营养,牛奶产量和组成的组成(Hristov,Price和Shafii,2005) 。为了优化牛群内的饲料成本的余量,对营养供应变化的准确预测比预测实际生产水平更重要(Hulme,Kellaway和1986)。

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