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ISSN 2095-5553 CN 32-1837/S
中华人民共和国农业农村部主管
农业农村部南京农业机械化研究所主办
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Design and test of intelligent feeding system for lactating sows
Lü Enli, Chen Gaofeng, , Xia Jingjing, , Wang Feiren, Wu Fan, , Zeng Zhixiong,
Abstract
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132
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To achieve intelligent feeding, userfriendly humancomputer interaction, and easy maintenance for lactating sows, a set of intelligent and precise feeding systems for lactating sows was designed. This system includes an intelligent feeder, a handheld personal digital assistant terminal, a central controller, and a CANBus bus. It enables convenient onsite management of pig entry and exit management, dynamic monitoring of pig status, and realtime alarm functions for abnormal conditions. In a largescale sow farm in Yunnan Province, 280 intelligent feeders for lactating sows were installed, and a production performance comparison test was carried out with the production line equipped with traditional feeding. The test results showed that intelligent feeding facilitates realized userfriendly humancomputer interaction, touchsensitive feeding, intelligent wet mixing, noncontact operation, and easy maintenance. Compared with traditional feeding, intelligent feeding increased the average daily feed intake of sows by 0.673kg and reduced the daily feed waste by 0.345kg, indicating significant differences (P<0.01) in the average daily feed intake and daily feed waste at different ages between intelligent feeding and traditional feeding. The number of healthy piglets per month increased by 10.44%, the number of healthy piglets per litter increased by 0.69, and the average weight of weaned piglets at 21 days increased by 0.370kg. The backfat loss of lactating sows decreased by 34.43%, and the 7-day weaning estrus rate increased by 4%. The return on investment analysis of the system demonstrated that intelligent feeding effectively reduces feed waste, improves production performance, and has a high return on investment, which can effectively help largescale pig farms reduce costs. This study provides a reference for the development and application of intelligent feeding systems for sows.
2023, 44 (7): 154-162.
doi:
10.13733/j.jcam.issn.2095-5553.2023.07.021
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Effect of tillage tools on the quality of strip rotary tillage
Yang Yanshan, Wu Fan, Zhao Yaping, Hu Zhichao, Gu Fengwei, Ding Qishuo
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1244
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In response to the requirements of the development of green and sustainable agriculture, the strip tillage has been popularized and applied in rice and wheat planting areas in southern China. In order to simplify the effect of tillage components on the quality of strip tillage, field experiments were carried out on chisel blade, straight blade and IT225 blade at 280, 380 and 510 r/min. The results show that the main factors affecting the tillage quality are the shape of the blade and the rotary speed. When the rotary speed is 510 r/min, the soil backfill rate created by IT225 blade is only 7%, and the backfilling effect is significantly lower than that of the straight blade and chisel blade with small tangent edge. Chisel blade can achieve better backfill and soil crushing effects, but it is unable to create a neat seedbed section due to the lack of side cutting edge. When the rotary speed is 180 r/min, the crosssection disturbance rate of the seed bed of the chisel blade is as high as 20%. The straight blade can form a neat crosssection of the seed bed and a soil backfill rate higher than 50%, but the particle size of the broken soil is too large to meet the needs of sowing. This study points out the direction for the optimization of belt rotary tillage components, that is, taking into account the characteristics of straight blade rotary tillage knife and chisel rotary tillage knife, and organically combining two or several knives to meet the needs of belt rotary tillage and seeding under different soil conditions.
2022, 43 (12): 184-189.
doi:
10.13733/j.jcam.issn.2095-5553.2022.12.027
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Experiment and analysis on the change law of environmental control factors in summer in reserve pigsty
Huang Zhitao, Cao Yongfeng, Xia Jingjing, Wu Fan, Zeng Zhixiong, Lü Enli
Abstract
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179
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In order to understand the change rule of the influencing factors of the environmental regulation of the reserve sow houses in summer, the temperature, relative humidity and ammonia in the reserve sow house were tested by changing the number of fans, fan combination, and wet curtain. The results showed that the more fans were turned on, the greater the range of temperature decrease (the maximum range was 2.66 ℃) and the greater the range of relative humidity increase (the maximum range was 9.76%), the more uniform the distribution of temperature and humidity in the ventilation direction in the reserve sow house. The maximum cooling range was 4.27 ℃, and the maximum increase of relative humidity was 24.17%. When the left and right fans were turned on, the distribution of temperature and humidity in the shed was more uniform than that of the left or right middle fans. The average
THI
index in the reserve female sheds was 79.5, with a decrease rate of 3.86%, which could effectively alleviate the heat stress of pigs. The uneven coefficient of temperature field and relative humidity field in the reserve piggery were 0.42 and 0.5, respectively, indicating that the distribution of temperature and humidity in the reserve piggery was relatively uniform.
2021, 42 (11): 50-57.
doi:
10.13733/j.jcam.issn.20955553.2021.11.09