It has been reported on the Internet that American chickens with hormones can grow six or seven drumsticks and six or seven pairs of wings. There are also manufacturers that specialize in buying dead chickens. But in fact, there is no problem in buying frozen chicken legs in the regular market.
Most of the frozen chicken parts in supermarkets are white feather chickens, which were introduced in the 1980s. After decades of development, under the large-scale feeding, white feather chickens can be released in 42 days, weighing 4 kg to 6 kg. In 20 17, the output of white feather chicken was 78 10000 tons, accounting for.
The reason why white feather broilers are more popular with catering industry and farmers than native chickens in China is that white feather broilers are big and soft in meat because of their high water content and thick myofibrils, but low density. Therefore, in the fields of fried chicken, roast chicken and boiled chicken breast, the consumption of white feather chicken has maintained a steady growth due to the popularity of fast food restaurants and fast food restaurants.
From the point of view of breeding, white feather chickens are big, easy to concentrate on breeding and epidemic prevention, and convenient for unified slaughter and processing. They were born canned. Most importantly, under the condition of large-scale feeding, the feed-meat ratio of white feather chicken is 1.8, that of yellow feather chicken is 2.5, that of pig is 2.7 and that of cattle is as high as 7.5. This means that with the same weight of feed, the weight of meat produced by white feather chicken is 3.2 times that of yellow feather chicken, which is really better than all livestock and poultry transformed by human beings before. (Feed-to-meat ratio refers to the ratio between the weight of feed input and the weight of meat products obtained, which can be simply understood as input-output ratio)
In addition, the breeding of white feather chickens is impossible to contain hormones, because the price of hormones is very expensive. In 20 17 years, the price of broilers was 6.78 yuan/kg, the lowest in ten years, and the price of hormones per kg was about 10 times that of broilers. Many experiments also show that adding hormones can not produce any magical ripening effect on chickens, and even have side effects on cardiovascular and liver functions of chickens, which may easily lead to death. Intensive farms feed broilers with the same hormone-containing feed, which is easy to cause a large number of chickens to die at the same time, which is not worth the candle; In addition, injecting hormones one by one is also very troublesome to operate.
Zhang Hongfu, a researcher at the Institute of Animal Husbandry and Veterinary Medicine, Chinese Academy of Agricultural Sciences, said that at present, hormones have not been found in broiler breeding in China or even in the world.
20 1 1 In order to refute the rumor, China Animal Husbandry Association specially entrusted China Academy of Inspection and Quarantine to test the hormone content of 27 chicken samples in Beishangguang, but none of them were detected.
The secret of short growth cycle of white feather chicken lies in breeding. Today's broilers can have such high production performance, and the breeding of improved varieties is indispensable. The usual breeding route of broilers is: the first generation introduces excellent varieties, the second generation is selected as parents, and the third generation is produced as commercial chickens.
Two years ago, China banned the import of grandparents' chickens from the United States, and the domestic production of white feather broilers was interrupted. The decline in the supply of white feather chickens led to the decline in consumption in 20 16 and 20 17 years. 20 19 China has bred the first generation of domestic white feather breeders, which will also promote the breeding and reproduction of white feather broilers.
The other is the feed ratio. To increase the absorption of white feather chickens, we should pay attention to the balance of protein, vitamins, trace elements and other substances. Chickens of different weeks should be fed with different proportions of feed to ensure adequate and balanced nutrition.
In feeding management, indicators such as light, temperature and humidity are set step by step by week, day and hour to accurately control the environment and ensure the growth of chickens.
This is also the reason why the output of white feather chickens is so large every year. Of course, compared with Chai Chicken such as Yellow Feather Chicken, White Feather Chicken has softer meat, less fat and less flavor substances. For roast chicken and lotus leaf chicken, which need whole chicken cooking, there are crisp and chewy requirements, and white feather chicken is even more embarrassing.
Many farmers deliberately split the chicken and sell it, which is why the chicken legs in the supermarket are never out of stock. They sell chicken heads, necks, legs and wings. Separate. For example, chicken is sold to sausage processing plants, chicken wings, chicken legs and so on. They are sold to fresh food stores, slaughtered, dissected, refrigerated and frozen, and sent all the way to places where you can buy them with credit cards.
The price of whole chicken sold separately is higher than that of whole chicken, which is a good deal for farms. Of course, if you don't like the taste of boiled chicken, you can also buy other kinds of frozen chicken online. Freezing is just a way of preservation. There are many kinds of frozen chickens.
Freezing itself does not make food more unsafe. On the contrary, freezing is a very effective means to ensure food safety, so it is no problem to eat frozen ingredients often. Of course, freezing an ingredient repeatedly is not good for you.
At present, most of the frozen foods we buy in supermarkets use quick-freezing technology, which is different from putting ingredients into the freezer of the refrigerator. It can quickly reduce the temperature of food to far below the freezing point of water (usually at minus 18℃). Because of the fast cooling speed, the water in food will enter a "supercooled" state. The "ice crystals" formed at this time are very small and will not seriously damage food cells. This quick-freezing method can reduce the activity of enzyme, slow down the chemical reaction in food, keep fresh for a long time and retain the original flavor of food to the greatest extent.
Freezing can effectively prevent the growth of microorganisms, and freezing can effectively kill parasites that may exist in food, including eggs. For raw aquatic products, freezing plays a great role.
The safety of frozen meat is greater than that of cold meat, even greater than that of "fresh meat" without cold chain preservation. International health agencies agree that frozen foods have little difference in nutritional value and can be used as part of a healthy diet. (Repeated thawing will lead to the destruction of cell structure and accelerate deterioration)
Of course, when we buy frozen food, we must first look at the freezing situation at the sales site and see if the freezer and refrigerator are in good condition. If there is no perfect freezing condition, it is best not to buy it, let alone choose those that are obviously thawed.