Table of Content

26 February 2025, Volume 50 Issue 1

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Comparative analysis on Hyperpigmentation of the Visceral Peritoneum in Nine Chinese Yellow⁃feathered Broilers

HE Jingyi, HE Yanhua, LIU Tianfei, LUO Wei, CHEN Peng, JI Jian, LUO Chenglong, SHU Dingming

2025, 50(1):  1-7.  DOI: 10.19978/j.cnki.xmsy.2025.01.01

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The study was aimed to investigate the characteristics of Hyperpigmentation of the Visceral Peritoneum（HVP）in nine yellow⁃feather broilers. In this study，we analyzed the relationship between HVP and body weight（BW），Shank circumference（SC），and sex in nine 21⁃day⁃old yellow⁃feathered broiler lines（n=6 223）. The results showed that there were significant differences in HVP traits among different strains in different population genetic backgrounds（P<0.05）. Notably local chicken exhibited a higher proportion of peritoneal black level 3 compared to specialized breeding lines. Under the same population genetic background，eight strains showed highly significant differences（P<0.01）in HVP，body weight，and Shank circumference，with lower BW and SC in the peritoneal black grade 3. Additionally，when males and females were analyzed separately，the HVP level was higher in the female chickens（P<0.01）. The findings from our experiment suggested that selective breeding for lower HVP levels should prioritize local chicken breeds and hen groups，which provide a basis for future yellow⁃feathered broiler breeding and production.

Effect of Insect Antimicrobial Peptides in Drinking Water on Performance，Meat and Egg Quality of European Pigeons and Squabs

CAI Yuanrong, LAN Liubin, XU Kunjie, WEI Baoning, CHEN Xiaoyu, CHANG Kaiyue, WANG Ziying, HAN Yuanhao, LUO Yongquan, WU Zhongping, CHEN Yitian, LIANG Yayan, ZHANG Xumeng

2025, 50(1):  8-15.  DOI: 10.19978/j.cnki.xmsy.2025.01.02

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In recent years，insect antimicrobial peptides（AMPs），as an antiplastic product，have been widely used in livestock and poultry production，in order to improve the growth performance and continuously promote the healthy development. In order to explore the effects of different AMPs levels on the growth performance，meat and egg quality of European pigeons and squabs，360 pairs of healthy European pigeons were selected and randomly divided into 4 groups. The blank control group was fed with water. Three experimental groups added AMPs at doses of 200 g/t， 400 g/t，and 600 g/t respectively to the drinking water，and the experimental period was 30 d. The results showed that the diarrhea number，enteritis and weight ratio of litter decreased（P<0.05），the weight increased（P<0.05），and the half chamber rate，chest muscle rate，leg muscle rate and shear force increased（P<0.05）. The thickness of the blunt end of the eggshell decreased（P<0.05） while egg weight，transverse diameter，longitudinal diameter，eggshell strength，protein weight，yolk weight，yolk ratio and Haugh unit（P>0.05）. The experiment showed that adding 600 g/t AMPs to drinking water could significantly reduce the diarrhea，enteritis and litter weight ratio of European pigeons， improve the growth performance and slaughter performance，but it reduced the meat tenderness. Therefore，adding 600 g/t AMPs to the drinking water of European pigeon can improve the production performance，providing a good way for pigeon healthy breeding. 

Effects of Compound Enzyme Preparations and Seaweed Oligosaccharides on Performance，Serum Biochemical Indexes and Meat#br# Quality of Huaxiang Black Pigs#br#

WU Qiwen, XIONG Yunxia, FAN Fuhao, MAO Jie, HE Qingqian, LI Zhiming, YE Xiufeng, GAO Kaiguo

2025, 50(1):  16-22.  DOI: 10.19978/j.cnki.xmsy.2025.01.03

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To investigate the effects of dietary adding compound enzyme preparation and seaweed oligosaccharides on growth performance，and pork quality of Huaxiang black pigs，120 pigs with the average body weight of 80 kg were selected and randomly divided into 3 groups with 4 replicates per group and 10 pigs per replicate. The treatments were control group （feeding a basal diet），enzyme preparation group （feeding the basal diet supplemented with 200 mg/kg complex enzyme preparation），and oligosaccharide group（feeding the basal diet supplemented with 400 mg/kg algal oligosaccharide）. The experiment lasted for 40 days. The results showed that compared to the control group，adding complex enzyme preparation increased the average daily gain（P<0.05）， increased the content of flavoring amino acids in longissimus dorsi muscle，and reduced the drip loss（P<0.05）. Compared to the control group，addition of oligosaccharides increased the redness，intramuscular fat content，and flavor amino acid content of longissimus dorsi muscle（P<0.05）. In conclusion，the compound enzyme preparation can improve the performance of pigs，and the addition of compound enzyme preparation and oligosaccharides can improve the meat quality of pigs.


Effects of Rosemary Residue in Diet on the Reproductive Performance in Gestating Sows

HE Yiping, TANG Jianping, CAO Xiaojian, LI Yulin, CHEN Xiaoqiang, DONG Xingzhou, XU Wen

2025, 50(1):  23-27.  DOI: 10.19978/j.cnki.xmsy.2025.01.04

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The experiment aims to investigate the effects of adding 2% rosemary residue to the diet on reproductive performance including piglet birth weight and live birth rate in pregnant sows. Using a completely randomized experimental design，a total of 60 Large White × Landrace sows with consistent breed，parity，similar physical condition，and good health were selected for mating. They were divided into two treatment groups，the control group and the experimental group，with 30 sows in each group and one pig in each replicate. The average fat score of the two groups of sows was not significantly different（P>0.05）. The control group of pregnant sows were fed a basic diet，while the experimental group was added 2% rosemary residue as a substitute for beet meal on the basic diet. The experiment lasted for 114 days. The results showed that using 2% rosemary residue in the diet of pregnant sows had no adverse effects on their reproductive performance and significantly reduce feed costs.

Effects of Green Forage on Performance of Magang Geese during Brooding Period

DONG Kaiting, LIANG Zijin, YUAN Chuangui, SHEN Xu, JIANG Danli, HUANG Yunmao, PAN Jianqiu, OUYANG Hongjia

2025, 50(1):  28-32.  DOI: 10.19978/j.cnki.xmsy.2025.01.05

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To investigate the effects of green forage on growth performance of Magang Goslings（1-28 days old）， 100 healthy Magang goslings（1⁃day old）from the same batch were randomly divided into experimental group and control group（n=50）with 5 replicates per group and 10 geese per replicate，and were fed until 28 days of age. During the experiment，both groups were provided with ad libitumaccess to feed and water，and the experimental group was fed a diet that included both formula feed and green forage，while the control group was fed only formula feed. The survival rate，daily feed intake，body weight and body size of goslings were recorded，and the ratio of feed to weight was calculated. The findings indicated no significant differences in body weight，daily gain and feed to gain ratio between the two groups during the initial 1 ⁃ 14 days. However，from day 15 to 28，the feed to gain ratio of the experimental group were significantly lower than those of the control group（P<0.05），while daily weight gain and the body weight of d21 and d28 was significantly higher than that of the control group（P<0.05）. There was no significant difference in body size between the two groups at the early stage of brooding，but at d28，the individual size indexes of the experimental group were higher than those of the control group（P<0.05）. The results showed that the addition of green forage in the brooding stage of Magang geese could promote the growth and development of geese and reduce the feed⁃to⁃weight ratio. This experiment provides a reference for the addition of green forage in large⁃scale breeding of Magang geese，but the amount and proportion of specific green forage added and its impact on subsequent breeding geese still need to be further explored.

Effects of Fresh Fermented Rapeseed Meal on the Growth rate，Serum Biochemical Indexes，Hepatic Antioxidant Capacity，Intestinal Digestive Enzyme Activity and Intestinal Flora in Grass Carp

WANG Yilin, WANG Yajun, CHEN Jianchou, ZHU Xuezhi, SHI Anning, WANG Yue, LIAO Jingxuan, LIU Liyan

2025, 50(1):  33-42.  DOI: 10.19978/j.cnki.xmsy.2025.01.06

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The experiment was to study the effects of different levels of moist fermented rapeseed meal fermented by Bacillus subtilis on the growth，serum physiology and biochemistry，intestinal digestibility and intestinal flora of grass carp（Ctenopharyngodon idella）. A total of 450 grass carp with an initial average weight of（51.60±0.56）g were randomly divided into 5 groups with 3 replicates and 30 fish per replicate. The amount of moist fermented rapeseed meal in each group was 0（control group），10%，20%，30% and 40%，respectively，and the amount of rapeseed meal was reduced accordingly. The experiment lasted for 8 weeks. The results showed that the condition factor of 20% and 40% moist fermented rapeseed meal groups was significantly higher than that of control group（P<0.05）. The contents of total cholesterol and high density lipoprotein in 40% group were significantly higher than those in control group（P<0.05）. Dietary supplementation of more than 20% of moist fermented rapeseed meal significantly increased intestinal α⁃amylase activity（P<0.05），and dietary supplementation of more than 30% of moist fermented rapeseed meal significantly increased intestinal trypsin activity（P<0.05）. With the increase of the replacement level of moist fermented rapeseeds，the numbers of Firmicutes，verrucobacteria and actinobacteria in intestinal tract increased， while the numbers of Proteobacteria and chloromyces decreased. Under the experimental conditions，moist fermented rapeseed meal had a certain growth⁃promoting effect，which could improve intestinal digestive enzyme activity and intestinal flora composition. The feed prepared with 20% moist fermented rapeseed meal is more beneficial to increase the fatness of grass carp，increase the lipid metabolism capacity of liver，reduce the oxidative damage of liver and improve the intestinal flora. The feed prepared with 30% and 40% moist fermented rapeseed meal formula has a good effect on improving intestinal digestive enzymes of grass carp.

Study on the Occurrence Patterns of Ketosis in Dairy Cows based on Dairy Herd Improvement Data

LI Fengxia, GUO Jianchao, LIU Jianying

2025, 50(1):  43-45.  DOI: 10.19978/j.cnki.xmsy.2025.01.07

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In order to explore the use of DHI（Dairy Herd Improvement，DHI）data to analyze the occurrence patterns of ketosis in cows，this article conducted an in.depth analysis of the DHI measurement data，lactation stages， and seasons of a cattle herd in a large ranch in the south of China for a production year. The results indicate that in the early lactation stage，the incidence of ketosis is higher in the third and fourth quarters，β-Hydroxybutyric acid has the strongest correlation with lactose，while acetone has the strongest correlation with urea nitrogen.

Establishment of the Real⁃time Fluorescent PCR Method for Camelpox Virus

ZHU Daozhong, MEI Mingzhu, LI Ming, TONG Tiezhu, WANG Ying, DING Ning, XU Juan, WANG Chunxia

2025, 50(1):  46-51.  DOI: 10.19978/j.cnki.xmsy.2025.01.08

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Camelpox（CML）is a widespread infectious viral disease of camels that occurs mostly in the Middle East and in North East Africa on a substantial scale and causes huge economic losses to the camel industry. In the present study，the homology comparison of the complete genome nucleotide sequences of 13 camelpox virus isolates published in GenBank were performed，then a set of specific primers and a specific probe based on their conserved sequences of the ATIP gene were designed and a real⁃time fluorescent polymerase chain reaction（PCR）assay was developed. The results showed that this method had high specificity，good repeatability，high sensitivity，and its minimum detectable limit was 7.8 copies/μL.

Isolation，Identification and Drug Resistance Analysis of Klebsiella Pneumoniae in Ring⁃tailed Lemurs

ZENG Fanwen, SA Jiaqi, ZUO Kejing, WANG Guoqian, Huang Kang, CHEN Xuanjiao

2025, 50(1):  52-58.  DOI: 10.19978/j.cnki.xmsy.2025.01.09

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In order to determine the cause of death of rong⁃tailed lemurs in a zoo in Guangdong Province，the methods were conducted through clinical autopsy and collection of disease materials，bacterial isolation and culture， morphological observation，16S rRNA gene amplification and sequencing analysis，virulence gene detection and drug susceptibility test. The results showed that a strain of Klebsiella pneumoniae was isolated in this study. The amplified fragment of 16S rRNA gene of the isolated strain was 1459 bp and the sequence similarity with 12 reference strains of Klebsiella pneumoniae on NCBI was more than 99.86% . Virulence gene test result showed that the bacterium contained uge，wabG，aereobctin，khe，rmpA，ureA and fimH virulence genes. The results of drug susceptibility test showed that the isolates were resistant to amoxicillin，penicillin，erythromycin and lincomycin in different degrees. This study provides a basis for the diagnosis and rational drug against Klebsiella pneumoniae in ring⁃tailed lemurs，as well as a reference for the prevention and control of Klebsiella pneumoniae.

Research Progress on the Application of Chinese Herbal Medicine in Pork Quality

CUI Yiyan, ZHOU Ningqiang, HUANG Zijun, WU Jieli, LUO Xuehui, MA Xianyong, YU Miao

2025, 50(1):  59-66.  DOI: 10.19978/j.cnki.xmsy.2025.01.10

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Chinese herbal medicine contains various bio⁃active compounds，such as polyphenols，alkaloids， polysaccharides，thanks to which Chinese herbal medicine has many pharmacological effects for example antioxidant， anti⁃inflammatory，and antibacterial. Chinese herbal medicine not only promotes animal growth and health，but also improves meat quality and flavor，which is of great significance to the feed industry and human health. This article reviews the characteristics of Chinese herbal medicine and its application in pork quality，in order to provide reference for further research on the effect of Chinese herbal medicine on meat quality.

Risks and Strategies in Safety of Prepared Livestock and Poultry Meat Dishes

HUANG Yuan, ZHANG Pian, CHEN Huiqian, YAO Yue, WU Jieli, CHEN Jinliang, WANG Xiaohu, WANG Gang

2025, 50(1):  67-71.  DOI: 10.19978/j.cnki.xmsy.2025.01.11

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In recent years，China‘s prepared dishes industry has developed unprecedentedly and has become a sunrise industry supported by the central and various levels of government. However，the safety and hygiene issues of prepared dishes have raised concerns among consumers. Prepared livestock and poultry meat dishes account for an important proportion in prepared dishes，and the solution to their safety and hygiene issues affects the public’s acceptance of prepared dishes products. This article analyzed the safety and hygiene risks of the whole supply chain of prepared animal and poultry meat dishes as following：veterinary drug residues，excessive heavy metals，pesticide contamination，and disease pathogens in the breeding process；the use of illegal additives and excessive additives in the processing process，refrigeration temperature issues in storage and transportation；packaging damage，and contaminated impurities. This paper offered the following solutions from the perspective of enterprises：actively build quality standards and standard systems； actively cooperate， participate and promote the construction of the certification system；establish traceable management system；applicate new technologies，including the new detection methods，physical preservation techniques for meat，and new refrigeration technologies.

Research Progress on the Canine Social Behavior and Human⁃dog Relationship

HUANG Huiwen, LIU Yuwen, GUO Yan, DENG Baichuan, ZHANG Lingna

2025, 50(1):  72-81.  DOI: 10.19978/j.cnki.xmsy.2025.01.12

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Throughout the long history of co⁃evolution with humans，dogs have developed a superior ability in the understanding and utilization of social signals within human society compared to other animals. While there has been considerable foreign research on dog social behavior and cognition and the human⁃dog relationship，this area of study is relatively new in China. This review summarizes the research progress on dog social cognitive abilities in human⁃dog interactions，focusing on the understanding and use of human social signals by dogs，their ability to send social signals to humans，and factors that influence dog social abilities with humans（i.e.，environmental，physiological，and genetic factors）. Currently，human understanding of dog social behavior is inadequate，with most research confined to laboratory settings and having limited practical application. Further research could provide scientific evidence for improving dog social behavior and human⁃dog interactions，fostering a more harmonious relationship between humans and dogs.

Effects of Different Incubation Programs and Types of Incubators on the Hatching Performance of Pigeon Embryos

XU Kunjie, HUANG Xiaofeng, YANG Hongqiu, WANG Ziying, CHANG Kaiyue, CAI Yuanrong, SHAO Linlei, LAN Liubin, HE Haopeng, LIN Chuanghao, LIN Suiyuan, XU Haoze, CHEN Yitian, ZHANG Xumeng, WU Zhongping

2025, 50(1):  82-87.  DOI: 10.19978/j.cnki.xmsy.2025.01.13

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The incubator is an important part of the artificial hatching of embryos in farms to improve production efficiency. An incubator with a reasonable internal structure design can effectively improve the hatching efficiency of the farm. The hatching program controls the incubator to operate automatically at each stage to ensure the relative stability of the environment inside the box. The design of a suitable hatching program should consider five factors such as temperature，humidity，ventilation，egg cooling and egg turning. Among them，temperature and humidity are the key conditions that determine the hatching effect. Formulating a scientific change in temperature and humidity can greatly improve the hatching effect of embryos. In order to understand the influence of different hatching programs and incubators on the hatching effect of pigeon embryos，this experiment set up two hatching programs and used two incubators. A total of 9，000 fertilized pigeon embryos were selected and randomly divided into 3 groups，with 3 replicates in each group and 1，000 in each replicate. The experimental settings are：Group A（a incubator + two ⁃ stage constant temperature），Group B（b incubator + two ⁃ stage constant temperature），and Group C（b incubator + single ⁃ stage variable temperature hatching）. The hatching results of the three groups of pigeon embryos，including data such as infertile eggs，dead embryos，healthy chicks，and weak and disabled chicks，were recorded. The results showed that in terms of hatching effect，the hatching rate and dead embryo rate of the single ⁃ stage variable temperature group C were better than those of the two ⁃ stage constant temperature hatching group B，with a significant difference（P<0.05）；the hatching rate of group A was slightly higher than that of group B，with no significant difference（P>0.05）. In terms of hatching effect，the hatching rate and healthy chick rate of group A and group C were higher than those of group B，with no significant difference（P>0.05）. There is no significant difference in the hatching effect between a and b incubators，but the hatching rate and healthy chick rate are slightly higher than those of b incubators，and the hatching window is slightly longer than that of b incubators. Each has its own advantages. Through the analysis of the hatching and hatching effects of pigeon embryos by two hatching programs and two incubators，the study has proved that single ⁃ stage variable temperature hatching is more suitable for the hatching needs of pigeon embryos and can be promoted to actual production as a new hatching program，providing design ideas for the hatching of pigeon embryos at the grass ⁃ roots level and the production of incubators.

Analysis of Practical Effects and Economic Benefits of the Contract System in the Feeding and Management of Nursery and Finishing Pigs

LIANG Longhua, HUANG Xiaohui, QIN Guoxi, SUN Rushui, MA Xiaoyu, CHEN Wenye, HE Rijing, LAN Xiaofei, GAO Kaiguo

2025, 50(1):  88-92.  DOI: 10.19978/j.cnki.xmsy.2025.01.14

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In recent years，in the context of the continuous fluctuation of the live pig market，in order to seek an effective path to reduce costs and increase efficiency，this study focused on the innovation of internal management mechanism，introduced and implemented the contract system model in the feeding management of nurseries and finishing pigs，and explored and analyzed different coverage rates of the contract system（0 in the control group，test group I &Ⅱ；50%，trial group Ⅱ ≥50% and trial group Ⅲ 100%）of feeding management and economic benefits. The results showed that：compared with the control group，there were no significant differences in final weight，average daily gain，feed to gain ratio，FSA，mortality and feed weight gain cost in experimental group Ⅱ when the contract system coverage rate was ≥50% during the whole feeding process（P>0.05），but the fattening and weight gain cost was significantly decreased（P<0.01）；When the coverage rate of contract system was 100%，the final weight and FSA of trial group Ⅲ increased significantly（P<0.01），feed to gain ratio，mortality rate，feed weight gain cost and fattening weight gain cost were significantly decreased （P<0.01）. To sum up，the fattening contract system significantly improves production performance，effectively reduces production costs，and improves economic benefits. According to the fattening pig sales unit price of 18 yuan /kg，the average fattening profit of test group Ⅱ and Ⅲ was improved. The deep⁃level reason analysis reveals that the implementation of the pig contract system can stimulate the labor enthusiasm and initiative of employees，which provides a powerful internal management mechanism innovation direction for the sustainable development of the pig farming industry.

Research on the Artificial Breeding Techniques of Bungarus Multicinctus Blyth

CHEN Xiaotong, LIN Hui, HUANG Mian, CHEN Xuanjiao, WEI Wenkang, CHEN Weiping, CHAO Zhi

2025, 50(1):  93-98.  DOI: 10.19978/j.cnki.xmsy.2025.01.15

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Abstract：Jinqian Baihua She is a highly-demanded precious crude drug derived from the dried juvenile body of Bungarus multicinctus Blyth（Yin Huan She）. It is necessary to promote and standardize the artificial breeding of B. multicinctus to assure its sustainable development. In this article，some explorations had been conducted on adult snake breeding，snake egg hatching，and infant snake nurturing. In terms of adult snake breeding，a breeding model of“multi-layer three-dimensional snake house”was proposed，and the layout of breeding boxes and specifications of breeding equipment were listed；an environmental humidity of 60%-65% was found to be suitable for the growth of B. multicinctus. In terms of hatching，it was found the eggs had a high hatching rate in yellow sandy soil at 27 ℃ and 88% humidity，and an approach for moisturizing the eggs was proposed. In terms of infant snakes nurturing，some first feeding bait were tested，among which newly hatched pond loach［Misgurnus anguillicaudatus（Cantor）］was the most preferred. The research might be valuable in the scientific breeding of B. multicinctus and the production of Jinqian Baihua She for reference.

Diagnosis，Prevention and Control of Mixed Infection Cases in the Reserve Breeding Pigeons Flock of a Large⁃scale Pigeon Farm in Guangdong

ZHU Xiaohua, CHEN Xiaobing, ZOU Yue, GU Xingge, BAI Yinshan, LIU Guoqian

2025, 50(1):  99-104.  DOI: 10.19978/j.cnki.xmsy.2025.01.16

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Through epidemiological investigation，clinical symptom observation，necropsy analysis，bacterial isolation and identification，and viral detection，this study examined multi⁃pathogen infections and drug susceptibility in reserve breeding pigeons from a large⁃scale pigeon farm in Guangdong under high⁃temperature and high⁃humidity conditions. The results revealed that the diseased pigeon flock was primarily infected with Newcastle disease virus （NDV），H9N2 subtype avian influenza virus，and pigeon circovirus（PiCV），accompanied by co⁃infections with Escherichia coli and Salmonella. Drug susceptibility testing showed that the pathogens were highly sensitive to gentamicin.The findings suggest that PiCV infection may enhance the susceptibility of pigeons to H9N2 avian influenza and play a critical role in mixed infections. This study provides clinical evidence for understanding the mechanisms of mixed infections in pigeons under immunosuppressive conditions and offers valuable insights for the comprehensive prevention and control of pigeon diseases.


Assessment of PCV2 Infection and Immuization Efficacy in a Large⁃Scaled Pig Farm in Guangdong

WEI Xiaoqi, XV Nuo, YAO Jianhui, ZHONG Weilin, YAN Guangzhi, CHEN Shengnan, LIU Mingjie, HUANG Liangzong

2025, 50(1):  105-119.  DOI: 10.19978/j.cnki.xmsy.2025.01.17

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The study aimed to evaluate the infection status of Porcine circovirus type 2（PCV2） and the effectiveness of immunization in a large⁃scale pig farm in Guangdong. Fluorescence quantitative PCR（qPCR）and ELISA were used to test 140 blood samples collected from the pig farm. The results showed that after immunization at 14 days of age，the average S/P value of Cap protein antibodies in piglets reached the highest at 1.093 at 21 days of age，with the highest antibody positive rate reaching 92%. In pigs aged from 90 to 198 days，the S/P value of Cap protein antibodies decreased from 0.764 to 0.418，and the antibody positive rate decreased from 80% to 35% ， indicating a downward trend in antibody levels after 90 days of age. In pigs aged from 133 to 198 days，the positive rate of Rep protein antibodies increased from 10% to 45%，and the nucleic acid positive rate increased from 10% to 95%. Moreover，42.1%（8/19）of the positive samples had a viral load greater than 107 copies/mL，suggesting that PCV2 infection occurred in the fattening pigs of this farm. The experiment showed that PCV2 infection occurred in the pig population around 133 days of age in this farm. The results of pathogen and serological testing provide a reference for optimizing the immunization program.

Pathogen Detection and Analysis of Sow Abortions in a Pig Farm in Guangdong

NIE Jingjing, CHEN Jialu, CHEN Jiayue, XU Shaodong, QU Yunzhi, LIU Zhicheng, ZHANG Jianfeng, ZHANG Chunhong

2025, 50(1):  110-117.  DOI: 10.19978/j.cnki.xmsy.2025.01.18

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In January 2024，some pregnant sows experienced clinical cases such as miscarriage and stillbirth in a large⁃scale pig farm in Guangdong Province. To diagnose the cause of the outbreak，blood samples from aborting sows and organs samples from stillborn fetuses were collected. Common pathogens causing miscarriage in sows，such as Porcine Circovirus 2/3（PCV2/3），Porcine Reproductive and Respiratory Syndrome Virus 2（PRRSV2），Porcine Pseudorabies Virus（PRV），Toxoplasma gondii，etc。，have been detected using fluorescence quantitative PCR methods. Then，the genotypes and subtypes of the detected pathogens were to identify via nucleic acid sequencing analysis. In addition，the bacterial pathogens were isolated and identified，and used for screening sensitive drugs to guide clinical medication. The results showed that PCV2d and Aeromonas rivipollensis are the main pathogens causing the disease of pregnant sows in this pig farm，and the latter is sensitive to penicillin，amoxicillin，cefradine，and florfenicol，indicating that these candidate drugs can be used for clinical treatment.


Serological Survey of Horse Chlamydia Infection in Some Areas of Guangxi

WU Qilin, BI JingShan, ZOU Lianbin, WU Jianhao, SU JiaoXiu, WEI Zhengji, ZHENG Min

2025, 50(1):  118-120.  DOI: 10.19978/j.cnki.xmsy.2025.01.19

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In order to understand the infection and prevalence of Chlamydia among horses in some area of Guangxi province，988 serum samples collected from 12 counties of Baise and Hechi in 2021-2023 were conducted indirect hemagglutination test（IHA）. Results showed that the positive rates of antibody against Chlamydia in horses from Baise and Hechi were 11.62%（65/542）and 12.56%（56/446）respectively，positive rates detected in Tianyang district，Lingyun county and Bama county were relatively high among 12 counties. From 2021 to 2023，positive rates of antibody against Chlamydia in horses were 13.28%（32/241），10.78%（33/306）and 12.19%（54/443），while average positive rates were 12.04%（119/988）in total. Positive rates of antibody against Chlamydia in stallions and mares were 11.49%（55/480）and 12.6%（64/508），showing no significant difference between different genders. Results of this study have enriched the background data on the prevalence of Chlamydia infection among livestock， especially in horse herds，in China.