First, the impact of feed on the composition of eggs within a certain range, the contents of some trace elements in eggs affected by the feed more obvious. Addition of vitamin A, vitamin D, or some B vitamins to the feed can increase their relative content in the egg. The content of mineral elements such as iron, copper, iodine, manganese and calcium in eggs also changes due to changes in their dietary levels. The content of vitamins and minerals in eggs affects the food value of commercial eggs. For eggs, it affects the hatchability and the health and growth of young birds. Second, the impact of feed on the quality of the egg shell 1, the impact of calcium and phosphorus calcium is the main component of the eggshell. In the absence of calcium in the feed, the thickness and strength of the eggshell are reduced. Therefore, the feed for laying hens should contain sufficient calcium. Shell powder and stone powder are the most commonly used calcium supplement feeds. Tests have shown that the two calcium feeds have essentially the same effect on eggshell quality, or that the former is slightly better than the latter. The grain size of these two feeds also has an effect on their utilization. In general, the effect is better when the particles are larger. Phosphorus is a mineral element that is essential for animals and is closely related to the metabolism of calcium. However, high phosphorus content in feeds will degrade eggshell quality. 2, the impact of vitamins. Vitamin D is closely related to the metabolism of calcium and phosphorus, so it has a greater impact on eggshell quality. The strength and thickness of eggshells are often reduced by the lack of vitamin D in the diet. Vitamin C can promote the metabolism of minerals in bone and increase the concentration of plasma calcium. Therefore, it can improve the eggshell quality to some extent. This effect is more pronounced when dietary calcium levels are low. Third, the impact of feed on the yolk color 1, the impact of pigment in the feed The yolk color is not only affected by the feed pigment content, but also by the nature of the pigment. The coloring of egg yolk by pigments in corn gluten is better than that of alfalfa flour and dried algae powder. The reason is due to the relatively high proportion of zeaxanthin in the pigment contained in corn. Synthetic pigments are also used in this area and have a good effect on the coloration of egg yolks. 2. Effects of lipids and antioxidants Lutein is dissolved in lipids, and its absorption in the intestine may be accompanied by the absorption of lipids. Therefore, the addition of oils and fats to the diet can increase the color of the egg yolk, especially when the pigment content of the diet is low. After the pigment is oxidized, it loses its coloring ability. Therefore, adding antioxidants to the diet can prevent oxidation of the pigment and increase the pigmentation of the egg yolk. Both vitamin E and ethoxyquin are effective in this regard, especially when unsaturated fatty acids are added to the feed. 3, the impact of other feed factors It is reported that excessive vitamin A and excess calcium can make the color of the egg yolk, some feed contains some unknown factors that affect the color of the egg yolk. If the addition of fine rice bran and barley to egg production reaches a certain level (20% for rice bran and 50% for barley), the color of the yolk will be significantly reduced. Fourth, the impact of feed on the taste of eggs Some odor more concentrated feed, such as onions, fish, etc., its smell can directly affect the taste of eggs. After some feeds are ingested, some of the products formed during the digestion and metabolism process will also produce odors in the eggs. Fishmeal, rapeseed cake, and choline, which are widely used in chicken diets, are often associated with odor production. Fifth, other effects of feed on egg quality Egg weight is affected to some extent by dietary protein levels. Raising protein levels, especially animal protein levels, contributes to an increase in egg weight. Some trace elements are related to the internal quality of the egg. Adding iron, copper, zinc and selenium to the diet can improve the internal quality of the egg. If the feed is contaminated by pesticides or toxic heavy metals, it can also affect the quality of the eggs.
Red Wolfberry 350 Specifications
Dried Red Wolfberry 350 Specifications,Ningxia Wolfberry 350 Specifications,Red Goji Berry 350 Specifications,Dried Wolfberry 350 Specifications
NINGXIA STARLIGHT FOOD TRADE CO.,LTD , http://www.starlightfood.com