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How long does the transmission of porcine reproductive and respiratory syndrome virus persist?
The porcine reproductive and respiratory syndrome (PRRS) virus has an enormous impact on the economic benefits of the global pig industry. This disease increases mortality and reduces pig production performance and growth rate, and increases the cost of vaccines and medications. Although many prevention and control measures have been proposed, their effectiveness after implementation still varies, so these measures are not suitable for some pig farms. The PRRS virus has long-lasting infectious pathogenicity and can spread both horizontally and vertically. Fetuses in the uterus and pre-weaning piglets are infected by this virus late, and it can spread throughout the entire piglet barn through virus-contaminated bedding.
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What special qualities does the Beijing duck have? A detailed guide
Special qualities: Beijing duck meat is rich in taurine, with more than 500 micrograms of taurine per gram of duck breast meat, which can promote the growth and development of infants and young children and help prevent and treat high blood pressure and diabetes; Beijing duck meat is rich in alpha-linolenic acid, which can be converted into EPA and DHA (brain gold), and all three help lower blood lipids and blood viscosity and reduce the occurrence of cardiovascular and cerebrovascular diseases such as coronary artery embolism, vascular sclerosis, stroke, and high blood pressure, while also having a good preventive effect on diabetes and skin diseases. Breed characteristics
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What types of lesions does duck cholera cause?
Duck cholera mainly presents as septicemic pathological changes, with grossly visible manifestations of petechial hemorrhages on the serous membranes and mucous membranes. The liver surface has pinhead-sized, grayish-white necrotic spots with neat edges; the spleen is enlarged with necrotic spots of varying sizes on its surface; hemorrhage in the coronary sulcus, endocardium, and epicardium and pericardial effusion; pulmonary congestion and hemorrhage; hemorrhage in the duodenal and rectal mucosa, and hemorrhage on the surface of the intraperitoneal, gastric, and mesenteric fat. 1. Peracute type The peracute type dies quickly, and necropsy shows no obvious pathological changes. 2. Acute type Acute dis
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How does the mountain lily reproduce? A detailed guide to common propagation methods
(1) Seed propagation: collect wild fruits in September, dry them in the sun, thresh them, and set them aside for later use. In mid-to-late April of spring, sow the seeds in rows on a bed at a row spacing of 20 cm, cover with 2 cm of soil, press down lightly, cover with a straw curtain, water frequently to keep moist, and remove the straw curtain after the seedlings emerge. (2) Bulb propagation: at harvest time, collect the small bulbs from disease-free plants, soak them for 30 minutes in a 500-fold aqueous solution of benomyl or captan for disinfection, then sow them at a row spacing of 20 cm x 5 cm. After one year of growth, some of the small bulbs reach
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Identification methods and management key points for vicious habits in does
Every year during the fawning and nursing period of does, in some deer farms, due to inadequate management techniques, incidents occur from time to time in which vicious-habit does harm newborn fawns and feeding management personnel. Some newborn fawns are clawed to death alive, and some feeders or technicians are clawed and injured. According to investigations, there was once 1 sika deer vicious-habit doe that, in the first few days after giving birth, clawed 5 newborn fawns to death and clawed and injured 2 young and strong feeding management personnel. The harm caused by vicious-habit does has led to a significant increase in fawn mortality and should be given full attention. 1 Identification
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How does the planting density of open-field potatoes affect yield?
Potatoes in Tongren City are mainly grown as an early-maturing vegetable. In order to explore the optimal density for open-field cultivation of virus-free potatoes, the Tongren City Agricultural Technology Station conducted a density trial on open-field cultivation of virus-free potatoes from 2006 to 2007. 1 Materials and Methods 1.1 Overview of the trial site The trial site was selected in the contracted field of Yang Xiuming, Hongdong Group, Mulong Village, Bahuang Town, Tongren City, at an altitude of 260 m. The trial field had sandy loam soil with medium fertility, and the previous crop was Houttuynia cordata (fish mint). 1.2 Trial materials The test variety was first-grade seed potatoes of "virus-free Mira", provided by
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Why does adding garlic to feed make pigs healthier?
Key tip: Adding garlic to pig feed can not only boost immunity, but also improve the environment, enhance pork quality, and increase growth speed. This is the first time you've heard of it, right? In Yongyuan Village, Yongyuan Town, Daowai District, Harbin, Heilongjiang Province, there is just such an expert breeder. Through nearly 4 years of breeding, she has gained a lot of experience. Her name is Ma Haiyan, and she is an ordinary specialized breeding household in Yongyuan Town, Daowai District, but her breeding method is different from other breeders. According to her own account, when she first started breeding, Ma Haiyan also followed the traditional method.
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How does the rice variety Gangyou 26 perform?
(1) Variety origin: A new medium-indica late-maturing hybrid rice combination developed by the Rice Research Institute of Sichuan Agricultural University by crossing "Gang 46A" with restorer line 6326 (Milyang 46 x Minghui 63). (2) Characteristics: The combination has a whole growth period of 149.1 days, 1 day longer than the control Shanyou 63, plant height 113 cm, vigorous seedling growth, above-average tillering ability, moderate plant type, about 160,000 panicles per mu, 150-170 grains per panicle, seed-setting rate 81-85%, 1000-grain weight 28-29 g, brown rice rate 79.7%, milled rice rate
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What effects does waterlogging damage have on the growth and development of tea plants?
Tea plants require moist air conditions, but they are not tolerant of excessively wet soil. When there is too much soil moisture or even standing water on the ground, the respiration of the root system is impeded, and its ability to absorb water and nutrients is reduced, seriously affecting the growth of buds and leaves and lowering the yield and quality of fresh leaves. In severe cases, the roots suffocate, anaerobic microorganisms become active, and organic acids are produced that poison the tea plant roots, causing peeling, necrosis and rot. The manifestations of tea plants suffering from waterlogging damage are: few absorbing roots, short and small lateral roots, a shallow root layer, and some lateral roots extending horizontally rather than downward, or even growing upward. Severely affected
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What other names does the Chinese herbal medicine Banxia have? A list of common names
[Aliases] Diwen, Dixing, Shuiyu, Shoutian, Shigu, Yangyan Banxia, Hegu, Xiezi Cao, Yanzai Wei, Dizhu Banxia, Mayu Guo, Mayu Guo, Sanbu Tiao, Sanye Lao, Sanye Banxia, Fanshizi, Di Zhegu, Di Cigu, Lao Huangzui, Lao Heshang Tou, Ye Yutou, Lao Guatou, Lao Guayan, Lao Yayan, Zhuozui Douzi, Di Badou, Wuxin Cai Gen, Tianluo Xing, Mayu Zi, Mayu Gen, Dilei Gong, Lao Guasuan, Gou Yutou, Zhu Banxia, Liedao Cai, Macao Zi, Yao Gou Dan. [Trade name] Banxia. Those that are large, round in shape, white in color, clean-skinned
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