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Identification Methods and Technical Key Points for Tea Plant Breeding Materials
Observe the traits of breeding materials, analyze the characteristics and features of various variant materials, select the superior and eliminate the inferior according to breeding objectives, and finally develop new varieties through comparative trials. The identification content is divided into 3 aspects: yield traits, quality traits and resistance. The yield traits of tea plants are mainly reflected in sprouting density and bud-leaf weight, growth speed, length of growth period, regeneration capacity after picking, and recovery capacity after suffering disasters or wounds; quality traits are mainly reflected in the chemical composition, color, pubescence,
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Tea plant sexual-line breeding methods and key technical points
A breeding method in which sexual progeny of tea plants are produced through the union of male and female gametes and, after selection, new cultivars are developed. The cultivars developed are called sexual-line cultivars. The methods are: 1. Selection of superior individual plants or types: according to the breeding objectives, carry out individual plant selection or group selection from the original material nursery or production tea gardens; 2. Seed collection and seedling raising: for the initially selected individual plants or groups, separately reserve and collect seeds, and raise seedlings separately by line, carrying out identification of seedling-stage traits and cultivar purity; 3. Family or group comparative trials: arrange comparative trials of the selected families or groups together with control
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Detailed Explanation of Tea Plant Clonal Breeding Techniques and Methods
A breeding method that combines single-plant selection with vegetative propagation to develop new varieties. Tea varieties developed through clonal breeding are called tea clonal varieties or tea vegetative propagation line varieties. They can reflect the heredity of the mother tree, maintain the excellent traits of improved tea varieties, have fast propagation speed and a short propagation cycle, and can be propagated through cutting seedling raising at the seedling stage, with a relatively high propagation coefficient. Since the promotion and success of short-stem tea cuttings, tea clonal breeding has been the selection method of "single-plant selection -- cutting propagation." The breeding method
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Procedures for Individual Selection in Fox Breeding
1. Primary selection: After weaning, selection is mainly based on the production performance of their ancestors. Those whose parents have excellent production performance, were born early, and developed normally are retained for breeding. For primary selection, young silver-black foxes should be born before April 5 for males and before April 10 for females; young Arctic foxes selected in the primary selection should be born before May 20. During primary selection, 40% more should be retained than the breeding plan requires. Selection of adult male foxes is carried out after mating, and selection of adult female foxes is carried out after the cubs are separated. Those with poor mating ability and poor semen quality
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Effective prevention and treatment methods for reproductive stress in breeding sows
1. Symptoms: (1) Abnormal bone metabolism, weak limbs and hooves, abnormal limb morphology and gait. Soft feet, hoof cracks, hemorrhage under the hoof shell, and in severe cases postpartum paralysis. (2) Sows show reproductive disorders, especially first-litter sows, with delayed estrus, anestrus or failure to come into estrus. More piglets born in the first litter, fewer in the second; or more in one litter and fewer in the next. Sows have weak disease resistance, reduced immune function, incomplete uterine involution, increased incidence of endometritis and mastitis, and are prone to various infections, with a higher culling rate. (3) Sow fertility and pig
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Detailed Explanation of Key Points on Off-Season Breeding Technology for Ayu Sweetfish
I. Facilities and Methods (I) Facilities 1. Nursery room. Converted from a plastic shed, 500 cubic meters of water body, black shading net to regulate light intensity, controlling light intensity below 5000 lux. 2. Broodstock rearing pond. Cement pond, rectangular (3 m x 2.65 m), pond depth 1 m, also serves as bait pond and nursery pond. 3. Water supply facilities. Groundwater is used, supplied by pumps through main and branch pipelines. 4. Aeration equipment. 2 ordinary air pumps, one air diffuser stone placed every 1-2 sq m in the nursery pond.
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Key Points and Methods of Koi Breeding Techniques Explained
Because koi are large in size, they are generally bred in ponds. Koi eggs are sticky, and the fertilized eggs adhere to aquatic plants and other attachments to develop, so artificial spawning nests must be placed in the pond where koi are bred. To increase output, artificial breeding can be carried out to raise fry. Sex identification in koi is relatively easy. By body shape, a fish with a plump belly is female, and one with a slender body is male; by the vent, the female's vent is broad and flat, while the male's vent is small and sunken inward. At the stage of sexual maturity, it can be checked by whether there are "nuptial tubercles" on the fin rays at the edge of the pectoral fins. Stroke the fin rays with your hand:
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Swordtail Fish Breeding Methods and Precautions Explained
Swordtail fish are ovoviviparous fish. Swordtail fish have very strong reproductive capacity. At 6-8 months of age, they enter sexual maturity. The male fish begins to chase the female fish, mating with her using the gonopodium to complete internal fertilization. The fertilized eggs hatch into fry inside the female fish's body and are then expelled. Swordtail fish are easy to breed and require no special management. When breeding, select broodstock over 5 cm, with a male-to-female ratio of 1:1 or 2:1. Lay more soft-leaved aquatic plants on the bottom of the tank and feed plenty of live bait. After the female fish becomes pregnant, her abdomen begins to swell and dark gravid spots appear. At this point, the male fish should be removed.
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Introduction to the Breeding Methods of the East Asian Scorpion "Shenlong No. 1"
The East Asian scorpion "Shenlong No. 1" is a new breed developed through hybrid vigor. Its advantages are large body size, high venom yield, short growth cycle, high litter rate, and high reproduction rate, and it has improved immunity to the original diseases and pests and adaptability to the growth environment, which facilitates feeding management. I. Characteristics: The features of this breed are similar to other East Asian scorpions. The trunk (from the anterior abdomen to the cephalothorax) is flat and elongated oval, and the posterior abdomen is tail-shaped. The entire body resembles a pipa shape, and the whole body surface is a highly chitinized hard skin. The body is
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When is the best breeding time for dogs?
After a puppy is born and reaches a certain age, the male dog can produce sperm capable of fertilization, which is called sexual maturity. Maturity does not mean that the period for possible breeding has arrived, because the dog's body has not yet fully developed and matured. About 12 months of age is the suitable time to begin breeding. Generally, small dogs reach sexual maturity earlier, while large dogs reach sexual maturity later. It is generally believed that sexual maturity occurs at 8-12 months after birth, and some as early as 6 months. It also varies across different regions of the country. For small and medium-sized dogs, 1-1.5 years of age, the survival rate of offspring is high.
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