Jiangnan No. 1 and Jiangnan No. 2: The high-yield duck-duck supporting system developed by Mr. Chen Lie from the Institute of Animal Husbandry and Veterinary Medicine of Zhejiang Academy of Agricultural Sciences won the second prize for provincial science and technology progress. The characteristics of these two types of ducks are: high egg production rate, long peak duration, high feed utilization rate, early maturation, strong viability, and suitable conditions for feeding in rural China. Has been promoted to more than 20 provinces and cities. The supporting ducklings are tan brown in Jiangnan No. 1, and duck feathers are dark brown with black spots. The Jiangnan No. 2 ducklings have darker hair color and more brown spots; the body plumes are light brown with fine and obvious spots. Jiangnan No. 1 female ducks have an average body weight of 1.6 to 1.7 kg at maturity. The age at the time when the egg production rate reaches 90% is about 210 days old. The peak period of egg production above 90% can be maintained for 4 to 5 months. The average egg production at 500 days is 305 to 310 eggs and the total egg weight is 21 kg. Jiangnan No. 2 female ducks have an average weight of 1.6 to 1.7 kg at maturity. The age of egg production at 90% is around 180 days. The peak period of egg production above 90% can be maintained for about 9 months. The average egg production at 500 days is 325 to 330 eggs and the total egg weight is 21.5 to 22.0 kg. Qingcao No. 1 duck: This is also based on the scientific and technical personnel of the Institute of Animal Husbandry and Veterinary Medicine of Zhejiang Academy of Agricultural Sciences on the basis of Jiangnan No. 2, according to the special needs of consumers on green shell duck eggs, Putian black duck blue shell egg strain was introduced. Made from matching hybridization. The main characteristics of its commercial generation are precocity, small egg shape, all producing blue shell eggs, adult duck feathers mostly black, weight 1.4-1.5 kg, 500-day egg production 290-320, total egg production 20 ~ 22 kg. This kind of duck is suitable for promotion in areas where market demand for blue shell eggs.
The advantages of Ultrasonic Cleaning Machine are:the ultrasonic cleaning effect is good and the operation is simple.The sound that people hear is an acoustic signal with a frequency of 20-20000 Hz.Sound waves with a frequency of more than 20000 Hz are called ultrasonic waves.The propagation of sound waves propagates longitudinally according to a sinusoidal curve,generating a large number of small bubbles.Ultrasonic cleaning machine one reason is that localized tensile stress occurs in the liquid and forms a negative pressure.The reduction in pressure supersaturates the gas originally dissolved in the liquid and escapes from the liquid and becomes a small bubble.Ultrasonic cleaning machine the other reason is that the strong tensile stress tears the liquid."A hollow,known as cavitation.
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