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How to ensure success in the three key areas when inducing spawning in broodstock in summer?
From the Start of Summer to Grain Full is the best period for inducing spawning in broodstock. At this time the water temperature is suitable, the spawning rate and hatching rate of broodstock are high, and the survival rate of fry after being stocked in ponds is also high. If this favorable opportunity is seized and strict control is exercised over the three key areas - broodstock selection, drug use, and spawning induction management - spawning induction can be successful. Selecting good mature broodstock Whether the broodstock used for spawning induction are mature determines the quality of the spawning induction results. When selecting broodstock, maturity is generally judged by external characteristics. Mature female broodstock have a distended, rounded, soft and elastic abdomen; in grass carp and silver carp, the ribs can be felt when touched with a finger, and the genital pore protrudes and is slightly red. Immature female broodstock have a relatively rounded front abdomen but a thinner rear abdomen, are not soft enough and lack elasticity, and the genital pore does not protrude or protrudes only slightly and shows no red color. Overmature female broodstock show an excessively distended abdomen that has elasticity but no resilience, like an inflated appearance, and the genital pore protrudes and is congested and purplish red. Therefore, when selecting broodstock, maturity cannot be determined by abdominal size alone.
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What are the prevention and control measures for heat stress in pigs during summer?
Heat stress refers to the sum of non-specific physiological responses made by an organism subjected to extremely high environmental temperatures in response to any demand the thermal environment places on it. With the rapid development of intensive high-density rearing methods, most southern regions increasingly and urgently need to alleviate the environmental pressure that summer high temperatures place on the pig farming industry, and the climate in the north also shows an upward trend; in recent years the highest temperature in Beijing has also reached over 40 degrees. The decline in pig productivity caused by heat stress has also increasingly drawn the attention of researchers in livestock environment and feed nutrition. Scholars from Japan, the United States, the United Kingdom and other countries
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After spring tea harvesting, attention should be paid to summer management of the tea garden.
After spring tea harvesting is finished, summer tea garden management work should be done promptly. 1. Fertilize in time. Apply 15-20 kg of urea per mu, or 25 kg of Zhongcha No. 1 fertilizer. Do not apply compound fertilizer with a high proportion of phosphorus and potassium, otherwise it will accelerate the reproductive growth of tea plants. During midsummer, carry out foliar topdressing. 2. Cultivate and weed. After June, apply chemical weed control once every 25 days. Commonly used herbicides include 10% glyphosate and 25% paraquat aqueous solution, etc. In July, deep-plow the tea garden once, which can both
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Key Management Techniques for Log-Cultivated Ganoderma in Summer
1. Thinning: About 10-20 days after the mature colonized logs are covered with soil, primordia begin to form. Because the light in artificial shade sheds is generally quite strong, the cut cross-sections of the logs are stimulated by light and tend to form numerous primordia. To improve the quality of the Ganoderma, excess primordia should be removed, leaving only 1-2 thick, sturdy primordia per log segment. If two primordia are kept, they should be more than 15 cm apart. Otherwise, after the caps differentiate, they will crowd and stick together, causing deformities and reducing commercial value. Thinning can be done by simply picking them off by hand, then covering the spot with fine soil.
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What is good to feed rabbits in spring and summer? Don't miss these three treasures
Garlic, dried tangerine peel and chili pepper are common seasonings in home cooking and are known as the "three treasures of the kitchen". Because they contain a variety of nutrients, are non-toxic and have no side effects, do not easily cause harmful residues in livestock products, and also have disease-prevention and therapeutic effects, they are also called the three treasures of pure natural agriculture and forestry breeding. In recent years, the author has used the three treasures in domestic rabbit production and achieved good results. 1. They can increase rabbits' appetite. Adding an appropriate amount of garlic powder, dried tangerine peel powder and chili powder to the feed can mask the unpleasant odor of certain feed ingredients, increase aroma, and improve the feed
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How to Handle Heat Stress in Chickens? Detailed Relief Measures for Summer and Autumn
Effects of Heat Stress on Broiler Chickens 1. Physiological and biochemical changes in broiler chickens under heat stress. When the ambient temperature rises, the body temperature of chickens rises along with the ambient temperature; at this point the heart rate speeds up, blood pressure drops, breathing accelerates and panting occurs, and in severe cases respiratory alkalosis develops. In addition, heat stress can also cause endocrine disorders: the adrenal corticosterone concentration increases significantly in the early stage of heat stress, but gradually declines as the stress period is prolonged; thyroxine secretion decreases, and the decline in its activity leads to a lower metabolic rate. 2. Effects of heat stress on broiler
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How can dried tea leaves be used to distinguish spring tea, summer tea, autumn tea, and winter tea?
Spring tea: The strips are tightly twisted, the buds, leaves, and stems are plump, strong, and heavy, the aroma is rich and fragrant, and occasionally young fruits the size of mung beans are mixed in - these are the characteristics of spring tea. Summer tea: The strips are loose, the tea leaves are light and bulky, the tender stems are thin and long, the tea fruits are the size of prayer beads, the bud tips often have fine hairs, and the aroma is slightly coarse and mature. Autumn tea: The tea leaves vary in size, the leaf blades are thin, light, and small, the aroma is mild, and occasionally tea flower buds and flowers are mixed in. Winter tea: The appearance of the tea leaves is slightly pale emerald green, the crude tea contains somewhat more yellow flakes, and the overall color is relatively uneven.
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How to care for northern azaleas in summer? Detailed explanation of methods for safely getting through summer
Azaleas prefer a cool, humid, well-ventilated environment. Due to the influence of temperature, light, humidity and other conditions in northern regions, azaleas must endure some challenges in the northern summer. If not handled well, multiple diseases can accumulate at once, the leaves can drop completely and the plant can die. So how can it get through the hot summer smoothly? Roughly, the following points should be grasped: Ventilation. Northern azaleas all overwinter in greenhouses. As spring arrives, temperatures keep rising. In early April, the indoor temperature at noon can reach around 28°C, and at this point ventilation should begin
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Key Points on Nutrition and Feeding Management of Rabbit Feed in Summer
In summer, supplement the rabbit's daily feed with feed protein and trace elements such as calcium and phosphorus. In hot weather, domestic rabbits generally have reduced appetite, so the compound diet should be varied; feed mixed feed at fixed times and in fixed amounts, giving small portions frequently, and prevent the feed from becoming moldy. The remaining shortfall should be supplemented with roughage such as green grass, vegetable leaves, hay, and tree leaves. It is best to shift feeding time from daytime to nighttime, and provide clean water at noon. In summer, manure and urine ferment easily, and parasites and bacteria multiply and spread very quickly, so attention must be paid to feed and drinking water hygiene; it is forbidden to collect plants that are toxic or contaminated with pesticides.
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Key Techniques for Planting Eggplant in July for Summer Cultivation
Open-field summer eggplant. Eggplant likes water, so during the long drought with no rain in July, supplement water to keep the soil moist. When watering, dissolve the fertilizers ammonium bicarbonate, monoammonium phosphate, and potassium sulfate in water at concentrations of about 0.3%, 0.15%, and 0.2% respectively. For furrow irrigation, after filling one furrow with plenty of water, evenly sprinkle the above fertilizers into the furrow to dissolve, with per-mu amounts of 15-30 kg, 10 kg, and 10 kg respectively. If there is no water shortage, you can dig a hole in the middle of every four eggplant plants and place
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