Effects of Limestone Powder Adding Proportion on Physicochemical Properties and Particle Quality of Corn-Soybean Meal Mash Feed
The purpose of this experiment was to study the effects of different adding proportions of limestone powder on the physicochemical properties and particle quality of corn-soybean meal mash feed.Corn and soy-bean meal were mixed at a mass ratio of 6:4 after grounded,and 0(control group),1％,2％,3％,4％ of limestone powder(feed grade)were added to determine the physicochemical properties such as powder proper-ties,hydration properties,and pasting properties of the feed mash with different proportions of limestone pow-der and the particle quality of feed pellet.The results showed as follows:1)compared with the control group,the friction angle and the repose angle of four experimental groups were significantly decreased(P＜0.05),while the apparent density and the tap density were significantly increased(P＜0.05),and the Hausner index was significantly decreased(P＜0.05).2)The adding proportion of limestone powder had no significant effects on the water solubility index,water absorption index and swelling degree of mash feed(P＞0.05).3)The peak viscosity,through viscosity,breakdown value,setback value and final viscosity of mash feed de-creased firstly and then tended to stabilize with the increase of the adding proportion of limestone powder,and there was no significant difference in the above indicators among the 2％,3％ and 4％ groups(P＞0.05);there was no significant difference in the pasting temperature among groups(P＞0.05).4)Compared with the control group,the power consumption per ton of material,pellet durability index(PDI)and starch gelatiniza-tion degree of the four experimental groups were significantly(P＜0.05),and the production rate was signifi-cantly increased(P＜0.05),while the pelleting rate had no significant change(P＞0.05);with the increase of the adding proportion of limestone powder,the hardness decreased gradually,and the hardness of 3％and 4％groups was significantly lower than that of the control group(P＜0.05).In conclusion,limestone powder has a promotional effect on improving the fluidity of the mash feed and the production capacity of granulator,and can also reduce the power consumption per ton of material,however,the starch gelatinization degree,hardness and PDI of pellet feed will be reduced.This study Provide reference data for actual feed production.In actual production,under the condition of meeting the particle quality and animal nutrition needs,limestone powder can be added appropriately to improve the production capacity of the granulator.[Chinese Journal of Animal Nutrition,2024,36(6):4062-4069]
万方数据
维普
