2009•Zhongguo xumu zazhiRequires access

Effects of Non-fiber Carbohydrate to Neutral Detergent Ratios on Ruminal pH Dynamics in Dairy Goats

Dan Shan

Abstract

Six Guanzhong dairy goats with permanent ruminal cannulae were used to determine the effects of four different ratios of NFC to NDF in diets on the ruminal pH dynamics.The NFC/NDF were1.02(Ⅰ),1.24(Ⅱ),1.63(Ⅲ) and 2.58(Ⅳ),respectively.In the present study ruminal pH were monitored continuously by continous ruminal pH measuring and recording system.The results showed that ①Ruminal pH values were decreased significantly with the increase of NFC / NDF.②with the increase of NFC/NDF,mean duration times under pH 5.2,5.5,5.8 and 6.0 were increased from 0,0,2.42 h and 9.40 h to 0.33 h,7.50 h,17.06 h and 20.53 h.Curve areas under 5.5,5.8 and 6.0 were increased from 0,0.21 and 1.43 to 1.09,4.84 and 8.59.The rate and degree of pH decline postfeeding and the duration of pH nadir were increased with increase of dietary NFC / NDF.

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Key concepts: Neutral Detergent Fiber, Animal science, Chemistry, Rumen, Carbohydrate, Food science, Biology, Biochemistry