-
A Detailed Guide to Practical Methods for Identifying Estrus in Foxes, Raccoon Dogs and Mink
I. Estrus identification in foxes: For the fox estrus period, the silver fox (silver-black fox) is generally from mid-January to mid-March; the Arctic fox (blue fox) is from mid-February to late April. Estrus in male foxes is easy to determine. A male fox entering estrus is active, drawn toward the opposite sex, has reduced feed intake, urinates frequently, and the "fox scent" in its urine becomes stronger. When a female fox is placed with it, the male shows great interest, continually mounting the female, and if the female is in estrus, mating is successfully achieved. Estrus identification in female foxes is relatively complicated; commonly used identification methods include the vulva observation method, the pair-pen teasing method,
-
How to Identify Poisonous Mushrooms? 5 Practical Methods to Teach You
First, look at the color. Poisonous mushrooms have brightly colored caps, with colors such as red, green, ink black, and purple-blue; purple ones in particular are often highly toxic and tend to change color after being picked. Second, look at the shape. Non-poisonous mushrooms have relatively flat caps, smooth surfaces, no rings on the cap surface, and no volva at the base. Poisonous ones have oddly shaped caps, thick and hard cap surfaces, rings and volva on the stem, and thin or thick elongated stems that break easily. Third, look at the secretions. Non-poisonous mushrooms have thick, concentrated secretions that are reddish-brown and tend to change color in the air after being torn apart. Fourth, smell the odor. Non-poisonous mushrooms have a distinctive fragrance, while poisonous mushrooms have a strange
-
How to identify the quality of fish feed? These practical tips are a must-know
The quality of pelleted feed for fish is closely related to farming profitability and should be given great attention. Its quality is mainly judged by five aspects: "look, smell, twist, soak, and chew," introduced as follows: First, look. Pelleted feed for fish is made by uniformly mixing and pelletizing several main raw materials such as fishmeal, soybean meal, cottonseed meal, rapeseed meal, wheat middlings, and meat-and-bone meal in a certain proportion. If there is more fishmeal and soybean meal, the feed color is slightly yellow; when there is more miscellaneous meal, the feed color is dark red; when there is more wheat middlings, the feed color is slightly grayish white, and so on.
-
How to Identify and Control Southern Rice Black-Streaked Dwarf Virus
Southern rice black-streaked dwarf virus is a rice viral disease occurring in southern rice-growing areas, with characteristics of strong explosiveness, rapid spread, great difficulty in prevention and control, and heavy damage losses. Rice and corn infected at the seedling stage will basically suffer total crop failure. In 2011, after comprehensive prevention and control, a total of about 8,500 mu of southern rice black-streaked dwarf virus occurred in Lianyuan City, of which the affected area of middle-season rice was 6,500 mu, the affected area of late rice was 1,600 mu, and the affected area of corn and other crops was 400 mu. A total of 25.93 tons of rice was lost, of which
-
How do you identify a plant's flowers? A guide to recognizing plant flowers
Plants bloom in order to bear fruit, and the fruit contains seeds. The seeds fall to the ground and grow again, and in this way the plant's life is propagated. This method of reproduction is called sexual reproduction. Of course, some plants can also be propagated by cuttings, or by burying their tubers in the soil.
-
Detailed Guide to Identifying Symptoms of Major Potato Diseases and Their Control Methods
I. Late blight. 1. Symptom identification. This disease is a fungal disease that affects stems, leaves and tubers. Affected parts of stems and leaves develop brown water-soaked spots, which later expand into black patches. When humid, a ring of white mold-like growth surrounds the lesions, very obvious on the underside of leaves. After tubers are affected, brown or blue lesions initially form, then expand, and the surface gradually becomes sunken, while the potato flesh beneath the lesion turns brown. 2. Control methods. Selecting disease-resistant varieties is the most economical and effective way to control late blight: such as Wushu No. 8, No. 9, No. 11, Longshu No. 3, No. 5
-
What methods are there for identifying the health status of grown silkworms?
1. Smell with the nose. When entering the silkworm room, smell the odor in the room. If the room has only the fresh scent of mulberry leaves and no other strange odor, it indicates that the grown silkworms are disease-free. 2. Listen with the ears. After feeding mulberry leaves, if the sound of the silkworms eating mulberry leaves is heard like the rustling of light rain, it indicates that the grown silkworms are healthy. 3. Look with the eyes. Observe the body color of the silkworms. Healthy silkworms generally have a blue-white body color. Silkworms at the peak of feeding have tight, glossy skin and are lively in movement, raising their heads and thoraxes when resting; the dorsal vessel beats rhythmically; the group develops uniformly in size; the feces have a certain shape (except for mature silkworms),
-
How to Identify Poisonous Mushrooms? Simple Identification Methods Shared
In terms of color, poisonous mushrooms often have bright colors, appearing red, green, yellow, etc. Their caps often bear variegated spots, with filamentous structures or small pieces of debris or scales on the surface. Non-poisonous mushrooms generally have dull colors, flat caps, and smooth surfaces. In terms of secretions, the caps or injured parts of poisonous mushrooms often exude reddish-brown, viscous, thick liquid, etc., with a pungent or other abnormal odor. The cap changes color easily after being torn. Non-poisonous mushrooms are generally drier, and the liquid exuded after breaking is white, with a distinctive mushroom
-
How to identify fish species? Observing appearance and color is key
First, look at the size specifications of the fish species. Fish of the same species from the same pond should be uniform and even in size when harvested, with little difference in body length and weight. Conversely, poor-quality fingerlings with large individual differences and uneven sizes often result in very low overall survival rates due to competition for food, mixed genetic stock, poor rearing, and other reasons. Second, look at the body color of the fish species. High-quality fingerlings have vivid, glossy body colors. Generally speaking, high-quality silver carp fingerlings should have a silver-gray back and silvery-white sides and belly; high-quality grass carp fingerlings have a pale golden-yellow body color, with gray-black reticulated scales that are relatively prominent, and the more robust the fish, the more obvious the pale golden-yellow color; high-quality bighead carp fingerlings mostly have a pale golden-yellow body color, with black markings across the body not very prominent. If the fingerling's body color is relatively dark, or even blackish, it indicates that the fingerling is a weak fry or diseased fish; the gloss on the body surface of fingerlings is caused by the mucus layer covering the body surface, which is the fish's first barrier of defense against disease. Diseased fish or weak fry lack the mucus layer, and their body surface has no gloss.
-
How to identify common easily confused symptoms in rice
I. Several kinds of bacterial wilt 1. Purple sheath blight bacterial wilt. Mostly seen in the late stage of late rice, often occurring in clumps in the field, and also with several plants affected in one hill. The base tissue of the rice is soft-rotted, with dark brown lesions. Peeling open the basal leaf sheath and stem, many black sclerotia smaller than amaranth seeds can be seen. 2. Bacterial foot rot bacterial wilt. Occurs sporadically in the field, generally 1-3 plants affected in one hill; the base of diseased plants shows mouse-gray rot, the root system is sparse and decayed, and peeling open the basal stem reveals it is full of foul water, with no sclerotia. 3. Physiological bacterial wilt. The rice stem shrinks and dries, and when the base of the rice stem is pinched by hand it is shrunken and hollow, making the plant prone to lodging, resembling damage by brown planthopper sclerotia. But there is no insect body at the stem base, no lesions, and no sclerotia in the leaf sheath and basal stalk; it mostly occurs when late rice is near maturity, with patches and blocks of bacterial wilt and wilting.
条件筛选