Eggs or duck eggs, with two egg yolks in one egg, are called "double yellow eggs". The incidence is extremely low. Things are rare and precious and are generally regarded as treasures. First, the "double yellow egg" favored: Japanese folklore "double yellow egg" as a symbol of husband and wife "a hundred years together," used as a wedding or wedding anniversary of the festive gifts. China’s folklore regards the “double yellow egg†as “lucky food†that can bring people auspiciousness and harmony. Sometimes a “double yellow egg†is found in the purchased eggs. If it is treasured, most of them are dedicated to the elderly or given to the only child. . Second, the "double yellow egg" nutrition: compared with the single yellow egg, edible parts of a single yellow egg: (1) solid matter: egg white accounted for 28%, egg yolk accounted for 72%. (2) Nutrients: a, egg white: mainly contains protein. B. Yolk: Mainly contains egg phosphoprotein, lipid phosvitin, phospholipid, triglyceride, cholesterol; phosphorus, sulfur, calcium, chlorine, potassium, sodium, magnesium, iron; VA, VE, VB1, VB2, niacin, Pyridoxime, pantothenic acid, biotin, folic acid, VD; lutein, zeaxanthin, cryptoxanthin, etc. In summary, most of the nutrients in an egg are concentrated in the yolk. The "double yellow egg" is the same size as the two egg yolks, so its nutritional value should be twice that of the single yellow egg. Third, the "double yellow egg" formation mechanism: (1) physiological reasons: more common in young hens, due to vigorous reproductive function, follicle stimulating hormone and ovulation induced by excessive secretion. (2) Genetic reasons: The high rate of double yellow has become one of the stable genetic genes. It has been transmitted from generation to generation, such as the double yellow rate of Xingzao 288 layer chicken being 2.77%; the double yellow rate of Gaoyou duck is 1%-14%. For the double yellow eggs under the above two reasons, the two egg yolks are similar in size. (3) pathological causes: mostly due to sudden surprise, mad rush to fly, abdominal pressure suddenly increased, breaking the "follicle suture marks", resulting in the removal of two or more yolk, two or more egg yolk size disparity. Fourth, the "double yellow egg" high-yield chickens, ducks Overview: At present, the vast majority of China's chickens and ducks are "double yellow egg" low-yield species, only one type of chicken that is hybrid 288 egg chicken, a duck The egg-and-meat-type duck, Gaoyou Duck, can be called "double yellow egg" high-yield poultry. The brief introduction is as follows: 1. "Double-yellow egg" high-yielding chicken: a. Xingza 288 layer chicken is cultivated by Canadian Shepherd Company's poultry breeding ground. Four-line matching eggs for hybrid chickens. The production performance is relatively high. According to the number of hens, the number of egg production per 500 days is 256 or more. At the age of 161 days of initial production, the ratio of eggs and eggs was 1:2.41, and the annual egg production was 260-280. The double yellow rate was 2.77% and the average egg weight was 63.2 grams. After the introduction of China, due to neglect of conservation work, serious degradation has occurred. Therefore, in our country's "double yellow egg" high-yielding chicken, the breeding workers still need to make great efforts to cultivate. B. Newly-produced "double yellow egg" high-yielding chickens in Japan: Japanese animal breeding scientists have conducted research on the cultivation of "double yellow eggs" high-yielding chickens to meet the special needs of consumers. Now they have been cultivated for 20-33 consecutive weeks. Produce double-yellow eggs with excellent double yellow eggs and high-yielding chickens. 2, "double yellow egg" high-yielding duck: Gaoyou duck produced in Gaoyou City, Jiangsu Province, China, is a combination of egg and duck. The production performance is relatively high, the growth rate is fast, the feed ratio is 2.8-3.0:1, the feed is 60 days old and weighs 2.6 kg, the whole net slaughter rate is 73%; the meat contains less fat, more lean meat, and is of good quality. The breeding ability is strong. The female duck is born at 140 days of age. The fertilization rate is 92%-94% and the hatching rate is more than 85%. The annual egg production is 220-262 pieces, and the egg weight is 90 grams. In the peak season of egg production, the average duck double yellow rate is 1%, and the double yellow rate of ducks in early spring can be as high as 10% to 14%. The high double yellow rate performance is stable. It is recognized as a “double yellow egg†high-yield duck by China and foreign countries and has been exported to Japan, the United States and other countries. China Agricultural Network Editor
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