Wild ducks, also known as wild ducks or ducks, are widely distributed in the world, especially in North America. China also has abundant wild duck resources. Taian City, Shandong Province, China introduced the mallard duck early in the United States. Shanghai and Beijing also introduced the German Mallard Duck from the German company. Hybrids of American wild ducks and wild ducks in China were used to breed West Lake wild duck breeds in Hangzhou, Zhejiang Province. Body appearance. The mallard duck is similar in shape to the duck, but its head and neck are short and thick, and the body is short and plump. The head and neck of the male drake are grayish green and metallic. The neck is covered with a white ring. The back is gray-brown and densely covered with brown and gray corrugations. The wings are grayish brown and the mirror feathers are purple blue. The plume is white and the dark brown is undulated. The abdomen is light brown with dark brown fine spots; tail feathers are white, and the two pairs of sexual feathers curl upwards in black. The head and neck of the female duck is black, slightly brownish-brown, with a brownish-black feathered edge and a "V" shaped spot; the wings are similar to the male but lighter; the lower body is brownish-yellow and disperses brown spots; the tail feathers are light Brown, feathery yellowish. Production performance. China's wild duck weight is generally 1.12-1.15 kg for ducks and 1.13-1.64 kg for ducks. American wild ducks weigh between 1.1 and 1.4 kg at 60-70 days of age and have a meat to meat ratio of 2.5-3.0:1. The total net defect rate is 87.5%. Ducks are sexually mature 110-120 days old, females are born 160-170 days old, male to female ratio 1:4-6, fertilized eggs are 90%-98%, fertilized eggs hatch rate is 80%-85%, incubation period 27-28 days. The annual production of eggs is 150-180, the weight of eggs is 57 grams, and the German wild ducks can produce about 185 eggs. Hearing aid technology has changed dramatically in the last 10 years. Hearing devices are nothing like the clunky hearing aids you might be imagining, the ones that seemed to amplify all the wrong sounds, and had a lot of feedback. Hearing devices have gotten smaller, smarter, sleeker, and more sophisticated. These devices can do more than ever before, and your hearing aids are full of programs and settings that make life easier for anyone with hearing loss. Bluetooth Hearing Aids,Hearing Aids,hearing aids rechargeable Shenzhen Sunshine Technology Co.,Ltd , https://www.shenzhenyatwin.com