Three 4-month-old growing wether goats were used to determine the ruminal P degradability of three classes of feedstuffs with in situ nylon bag technique. Three classes of feedstuffs were cereal (maize, wheat, barley, buckwheat, rice, millet, and sorghum), legume (horsebean, soybean, pea, mungbean, and jequirity) and tuber (potato, sweat potato, and cassava). The experiment consisted of 15 periods. During each period, the ruminal P disappearance of each one of these feedstuffs was measured at 0, 2, 4, 8, 12, 24 and 36 h, respectively. The exponential model of crskov and McDonald was employed to estimate degradation kinetics. Results showed that the degradability of feed P ranged from 805 to 986 g/kg P. Effective degradability of P generally exceeded 830 g/kg P, except for rice and millet. This updates the feed database of in situ P degradability in China, which would play an important role in improving biological P efficiency for modern ruminant production system.
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机译：采用原位尼龙袋技术，使用三只4个月大的生长中度山羊来测定三类饲料的瘤胃P降解性。饲料的三类是谷物（玉米，小麦，大麦，荞麦，大米，小米和高粱），豆类（（豆，大豆，豌豆，绿豆和j茎）和块茎（马铃薯，汗马铃薯和木薯）。实验包括15个时期。在每个时期中，分别在0、2、4、8、12、24和36 h时测量这些饲料中每一种的瘤胃P消失。使用crskov和McDonald的指数模型估算降解动力学。结果表明，饲料P的降解能力为805至986 g / kgP。除大米和小米外，P的有效降解能力通常超过830 g / kgP。这将更新中国原位磷降解性的饲料数据库，这对于提高现代反刍动物生产系统的生物磷效率将发挥重要作用。
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