Prediction of Degradation Regularity of Corn with Different Particle Sizes in Rumen of Lactating Dairy Cows

ZOU Yang; YANG Zhanshan; LI Shengli; CAO Zhijun

doi:10.3969/j.issn.1006-267x.2014.12.013

Chinese Journal of Animal Nutrition >

2014 , Vol. 26 >Issue 12: 3643 - 3650

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.12.013

Ruminant Nutrition

Prediction of Degradation Regularity of Corn with Different Particle Sizes in Rumen of Lactating Dairy Cows

ZOU Yang ,
YANG Zhanshan ,
LI Shengli ,
CAO Zhijun

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State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China

Received date: 2014-06-03

Online published: 2014-12-05

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Abstract

This study using five lactating Holstein dairy cows with ruminal cannulas was conducted to predict ruminal degradable dry matter (RDDM) and ruminal degradable starch (RDS) contents of corn with different particle sizes. The particle sizes of corn were 300, 450, 600, 2 360 and 6 000 μm, respectively. The nylon bags were put in at the same time and took off fractionally in the degradation test, and the sampling time were 2, 4, 8, 12, 24 and 48 h, respectively. The results showed as follows: with particle size of corn, excepting a poor correlation of degradation rate of starch at 0 h (R²=0.311 3), liner correlations were found in degradation rates of dry matter and starch at the other time points (R² of dry matter was 0.679 0 to 0.933 4, R² of starch was 0.746 7~0.993 1, P<0.10); significant liner correlations were found in rapidly (R²=0.854 0) and slowly degraded parts of dry matter (R²=0.901 0) and RDDM (R²=0.879 9), as well as slowly degraded part of starch (R²=0.901 0) and RDS (R²=0.929 0)(P<0.05). Regression formulas of predicting the contents of RDDM (y₁, %) and RDS (y₂, %) of corn using particle size (x, μm) distribution are established, which are as follows: y₁=67.96-0.005 4 8x, R²=0.88, P=0.019; y₂=70.12-0.005 36x, R²=0.93, P=0.008.

Key words： corn; particle size distribution; starch; ruminal degradation rate; lactating cows

Cite this article

ZOU Yang , YANG Zhanshan , LI Shengli , CAO Zhijun . Prediction of Degradation Regularity of Corn with Different Particle Sizes in Rumen of Lactating Dairy Cows[J]. Chinese Journal of Animal Nutrition, 2014 , 26(12) : 3643 -3650 . DOI: 10.3969/j.issn.1006-267x.2014.12.013

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