›› 2018, Vol. 45 ›› Issue (7): 1813-1823.doi: 10.16431/j.cnki.1671-7236.2018.07.011

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Analysis of the Status of Protein Feedstuffs Batching Fidelity by Statistical Process Control and the Causes of Batching Error

TAO Linli1, GAO Tingting2, GAO Yinghong3, YANG Xiujuan1, HUANG Wei1, LI Xiaozhen4, GAN Wenbin5, ZHANG Xi1, XU Zulin2   

  1. 1. Yunnan Key Laboratory of Animal Nutrition and Feed, Faculty of Animal Science and Technology, Yunnan Agricultural University, Kunming 650201, China;
    2. Division of Grassland Mountain and Feed, Department of Agriculture of Yunnan Province, Kunming 650224, China;
    3. Kunming Yunling-Grand Breeder Poultry Feed Co., Ltd., Kunming 650215, China;
    4. Yunnan Xiernan Feed Co., Ltd., Kunming 650216, China;
    5. Yunnan Veterinary Medicine and Forage Inspection Institution, Kunming 650201, China
  • Received:2017-12-26 Online:2018-07-20 Published:2018-07-20

Abstract:

The study was aimed to analyze the status of batching fidelity of protein feedstuffs by statistical process control (SPC) and the causes of batching error,in order to offer references for the quality management of batching process in feed mill.Batching preset values and actual bacthing values of three protein feedstuffs including soybean meal, fish meal and extruded soybean of piglet feed from two feed mills (A and B) in 2015 were used as the research data,and the status of batching fidelity was analyzed by individual and moving range control charts (X-MR) and process capability method.The results showed that for feed mill A,process capability index (CPk) of soybean meal,fish meal and extruded soybean were 0.20,0.11 and 0.01,respectively,and the feed batching fidelity of extruded soybean was the worst;Batching values of three protein feedstuffs were much higher than preset values.For feed mill B,the CPk of soybean meal,fish meal and extruded soybean were 0.24,0.12 and 0.24,respectively.The feed batching fidelity of fish meal was the worst,and the batching process of extruded soybean had out of control situation.The batching errors of protein feedstuffs exceeded the demands of ±0.3% FS,indicating that the batching fidelity of protein feedstuffs of two feed mills was low.The reasons of low batching fidelity were the technology parameters of batching scale in two feed mills were unreasonable.The parameters of air dropping values and inlet amount should be improved, and there were operational mistakes in feed mill B.In conclusion,using SPC could visually monitor the feed batching process,improve batching accuracy of protein feedstuffs, reduce waste of protein feedstuffs and feed processing cost,so improve quality management level of feed mills.

Key words: feed; feed batching fidelity; dynamic batching accuracy; individual-moving range control chart (X-MR); process capability indices

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