-
Breeding Methods and Key Technical Points for White Raccoon Dogs
White Raccoon Dogs and Their Characteristics. Raccoon dogs in nature have always been dark brown; this common, ordinary color type is genetically known as the wild type. In 1974, the Harbin Zoo in Heilongjiang Province acquired a rare male white raccoon dog (with pale pink eyes and muzzle), and in 1980, white raccoon dogs or piebald raccoon dogs with yellowish-brown or pale blue eyes and black muzzles were successively found among domestic raccoon dog populations in the three provinces of Northeast China. These special color types, distinct from the wild-type coat color, are called mutant types. The Institute of Special Animal and Plant Sciences of the Chinese Academy of Agricultural Sciences used these valuable white raccoon dog mutant genes
-
How to Raise Reindeer? A Detailed Guide to Feeding and Breeding Techniques
Reindeer (Kangifertarandus) belong to the order Artiodactyla, family Cervidae, and are animals native to the Arctic and subarctic regions. In China, reindeer mainly inhabit the dense forests on the northwestern slope of the Greater Khingan Mountains, with an activity range of 120°15' to 123°35' east longitude and 51°15' to 53°15' north latitude, and they have strong cold resistance. Reindeer have high economic value; their antlers, hides, meat and milk can all be utilized, and because of their peculiar appearance and gentle nature, they also have high ornamental value in zoos.
-
Application of Anther Culture Technology in Rice Breeding
Using disease-resistant plants from the first backcross generation for anther culture can transfer disease-resistance genes into japonica rice in a short time, accelerating the process of disease-resistant breeding in japonica rice. Zhejiang Agricultural University began making crosses in 1975. An anther culture was carried out in 1976, and by 1977 stable varieties resistant to rice blast and bacterial leaf blight, such as Dan 209, had been developed. The whole process took only 3 years, and resistance genes for two diseases were transferred at the same time; its breeding speed and efficiency greatly exceeded the conventional research methods of Japanese scholars. This study also explored the approach of applying the anther culture method in seed production to produce foundation seed. Tests showed that pure lines from anther culture had a certain effect of purification and rejuvenation compared with foundation seed produced by the "three-plot method." Anther-cultured disease-resistant varieties have now been used as resistance sources for late japonica rice.
-
Detailed Explanation of Key Points for Artificial Breeding of Mullet
Selection and cultivation of broodstock: In autumn or early winter, select intact and uninjured individuals from those caught in sea areas or from adult fish raised in seawater or brackish water as broodstock. Female fish should be 3 years old and weigh more than 1.5 kg; male fish should be 2 years old and weigh more than 1 kg. The broodstock pond area should not be too large, preferably 1500-2000 sq m, with a water depth of 1.5-2 m, access to seawater and freshwater sources, and convenient drainage and irrigation. The stocking density per mu of broodstock pond should not exceed 100 kg. Mullet begin to seek food in small amounts at a water temperature of 4°C,
-
How do pufferfish breed? A detailed explanation of breeding methods and techniques
1. Selection of broodstock: The broodstock selected must be strong, with fully mature gonads, and the female and male broodstock used must be in heat at the same time. The broodstock must have the characteristics of the species, and the female and male broodstock should normally appear affectionate with each other. Avoid selecting tropical fish from the same brood or with close blood relations as broodstock, to prevent inbreeding from causing degeneration in the quality of the offspring. Tropical fish with torn fins, disabilities, or deformities should not be used as broodstock. 2. Preparation of the breeding tank: Because broodstock species differ, the breeding tank also differs. Generally, for tropical fish that lay floating eggs
-
Methods for Introducing Snakes and Key Points for Breeding
The quality of snake introduction directly affects the survival rate and reproductive capacity of the snakes. To obtain breeding snakes, you can apply for approval from the relevant management authorities and capture snakes in the wild yourself. If local snake resources are scarce, you will need to introduce breeding snakes. 1. The best seasons for introduction are spring and autumn. In spring, the weather is suitable, and shortly after introduction the snakes will enter the egg-laying or birthing period, which is especially suitable for beginners. Autumn is also a good season for introduction, because the weather is neither too cold nor too hot, and it is the peak season for snakes to hunt, and also
-
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.
-
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
-
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.
-
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:
条件筛选