In order to ensure quality of pellet feed and improve production performance of animals, factors affecting the quality and granulating property of pellet feed were analyzed from the aspects of raw materials, process a...In order to ensure quality of pellet feed and improve production performance of animals, factors affecting the quality and granulating property of pellet feed were analyzed from the aspects of raw materials, process and equipments. The effects of these factors on production of pellet feed decline in the following order： composition and proportion of raw materials; material fineness; refining temperature and other refining factors; equipments like ring die and press roller; and cooling and drying conditions展开更多
In order to solve the problem that the musk deer concentrated feed were easy to get rancidity in spring, summer, autumn and freezing in winter, high quality and palatability pellet feed of musk deer was researched and...In order to solve the problem that the musk deer concentrated feed were easy to get rancidity in spring, summer, autumn and freezing in winter, high quality and palatability pellet feed of musk deer was researched and developed to ensure the quality of musk deer＇s feed. Twenty-eight male musk deer （3 - 10 years old） （Moschus berezovskii） with normal body condition in the same culture conditions were chosen and were randomly divided into experimental group （fed pellets group） and control group （original feeding diet group）, the results show that musk deer was able to adapt to the pellet feed generally in 13 days and the duration varied with the palatability of pellet feed. During the trial period, the difference of the body weight, the average musk yield of producing musk deer and the producing musk incidence between the experimental group and the control group was not significant, the incidence of disease and mortality of experimental group deer was significantly lower than the control group.展开更多
In order to explore the mechanical properties and breaking behavior of pellet feed during chewing,the experiments of texture mechanics,followed by the modeling and simulation of pellet feed based on the discrete eleme...In order to explore the mechanical properties and breaking behavior of pellet feed during chewing,the experiments of texture mechanics,followed by the modeling and simulation of pellet feed based on the discrete element method were carried out in this research.Five wet basis moisture contents(8%,10%,12%,14%and 16%,respectively),two kinds of loading directions(L and D direction,respectively)of pig pellet feed were selected as variables.First,mechanical parameters including hardness,elasticity,tackiness and chewiness were measured by a texture analyzer.The results of compression tests showed that the hardness of pig pellet feed was 5.44-32.43 N,the elastic index was 0.04-0.94 mm,the tackiness was 0.07-6.63 N,the chewiness was 5.52-27.39 mJ.Moreover,the hardness,tackiness and chewiness of pig pellet feed decreased significantly with the increase of moisture content but the elasticity showed an adverse varying trend.The hardness,elasticity,tackiness and chewiness along D direction outweighed that of L direction in numerical data at the same moisture content.Then,the chewing and breaking processes of pellet feed were simulated based on the discrete element method(DEM)combined with bonding particle model,in which the whole pellet feed were considered as agglomerations of micro-particles and broke when the stress between micro-particles had exceeded the maximum limit.Multi-parameter optimization experiments were carried out using quadratic orthogonal rotation design,in which stiffness coefficient(X_(1)),critical stress(X2)and bonding radius(X_(3))were the influencing factors,hardness(Y_(1)),elasticity(Y_(2)),tackiness(Y_(3))and chewiness(Y_(4))were evaluating indicators.Based on the regression analysis of the Design-Expert 8.0.6 software and response surface analysis method,the relationship between the three influencing factors and evaluating indicators was established.The similarity between experimental and simulated results in feed morphology and mechanical index proved that the modeling method for pellet feed based on DEM was effective and accurate.This work can provide a reference for the feed forming process and the optimization design of the related feed machinery.Meanwhile,the DEM model provided a new method for evaluating the texture and palatability of pellet feed.展开更多
基金supported by the grants from the Key Technology R&D Program of Tianjin City (10ZHXHNC08900)
文摘In order to ensure quality of pellet feed and improve production performance of animals, factors affecting the quality and granulating property of pellet feed were analyzed from the aspects of raw materials, process and equipments. The effects of these factors on production of pellet feed decline in the following order： composition and proportion of raw materials; material fineness; refining temperature and other refining factors; equipments like ring die and press roller; and cooling and drying conditions
基金Supported by Sci-tech Achievement Transformation Project from Sichuan Provincial Science and Technology Department([2007]33)
文摘In order to solve the problem that the musk deer concentrated feed were easy to get rancidity in spring, summer, autumn and freezing in winter, high quality and palatability pellet feed of musk deer was researched and developed to ensure the quality of musk deer＇s feed. Twenty-eight male musk deer （3 - 10 years old） （Moschus berezovskii） with normal body condition in the same culture conditions were chosen and were randomly divided into experimental group （fed pellets group） and control group （original feeding diet group）, the results show that musk deer was able to adapt to the pellet feed generally in 13 days and the duration varied with the palatability of pellet feed. During the trial period, the difference of the body weight, the average musk yield of producing musk deer and the producing musk incidence between the experimental group and the control group was not significant, the incidence of disease and mortality of experimental group deer was significantly lower than the control group.
基金The authors acknowledge that this work was financially supported by the Beijing Natural Science Foundation Program(No.6194043)Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics(No.QETHSP2019007)China Agriculture Research System(CARS-43-01A).
文摘In order to explore the mechanical properties and breaking behavior of pellet feed during chewing,the experiments of texture mechanics,followed by the modeling and simulation of pellet feed based on the discrete element method were carried out in this research.Five wet basis moisture contents(8%,10%,12%,14%and 16%,respectively),two kinds of loading directions(L and D direction,respectively)of pig pellet feed were selected as variables.First,mechanical parameters including hardness,elasticity,tackiness and chewiness were measured by a texture analyzer.The results of compression tests showed that the hardness of pig pellet feed was 5.44-32.43 N,the elastic index was 0.04-0.94 mm,the tackiness was 0.07-6.63 N,the chewiness was 5.52-27.39 mJ.Moreover,the hardness,tackiness and chewiness of pig pellet feed decreased significantly with the increase of moisture content but the elasticity showed an adverse varying trend.The hardness,elasticity,tackiness and chewiness along D direction outweighed that of L direction in numerical data at the same moisture content.Then,the chewing and breaking processes of pellet feed were simulated based on the discrete element method(DEM)combined with bonding particle model,in which the whole pellet feed were considered as agglomerations of micro-particles and broke when the stress between micro-particles had exceeded the maximum limit.Multi-parameter optimization experiments were carried out using quadratic orthogonal rotation design,in which stiffness coefficient(X_(1)),critical stress(X2)and bonding radius(X_(3))were the influencing factors,hardness(Y_(1)),elasticity(Y_(2)),tackiness(Y_(3))and chewiness(Y_(4))were evaluating indicators.Based on the regression analysis of the Design-Expert 8.0.6 software and response surface analysis method,the relationship between the three influencing factors and evaluating indicators was established.The similarity between experimental and simulated results in feed morphology and mechanical index proved that the modeling method for pellet feed based on DEM was effective and accurate.This work can provide a reference for the feed forming process and the optimization design of the related feed machinery.Meanwhile,the DEM model provided a new method for evaluating the texture and palatability of pellet feed.
