(1) The principle of purchase is big, weight gain, lean, less fat, and no disease. (2) All types of cattle, dairy cows, and hybrid cattle can be selected, but hybrid cattle and purebred beef cattle and dairy males are better. You can also make use of purebred Charolais, Limousin, Simmental, Sea Volt, Angus bulls and cows or local cattle hybrids produced by the offspring of vegetable cattle; if there is no cattle in the area, can also be used The offspring of the cross between the dairy bull and the local yellow cattle are generally high in growth rate and feed utilization rate, and have short feeding cycles, quick results, and large profits. (3) Age requirements If you use a calf as a vegetable calf, choose a calf before 12 months of age is the best, followed by 12 to 18 months of age, and then rearrange it for 2 to 6 months; if you use the decommissioned cattle, the requirements Most of the teeth are intact and can feed normally without affecting the digestion of the fish. (4) Gender requirements Generally, bulls should be selected as vegetable cattle, followed by yak and cows. Because the bull gains the most weight, both the feed conversion rate and the lean meat ratio are high. However, when fattening a bull over 2 years of age, it should be castrated first, otherwise its muscle fibers will be rough, and the meat will have a smell of fish, which will reduce the food value. (5) Body appearance The ideal appearance requirements for fattening cattle are: the head is more fleshy, the neck is short and thick, the chest is wide and deep, the flesh bones are open and fleshy, the back waist and the fart are wide, the limbs are short straight, the skin is soft, the hair is bright Full body muscles. The entire body looks like a "brick" in shape and looks like a "drum." However, attention should be paid to the large calves with large heads, large bellies, thin necks, and sharp tips (which were mostly poorly developed in the early stages) and large calves that have the image of calves (long-limed limbs, small abdomen, and shallow body). , are not suitable for vegetable cattle. This kind of cattle has a long and expensive fattening time and it is difficult to increase the amount of meat produced by fattening. (6) Health status When purchasing, you should learn from the original breeder about the source of the cow, the history of its use, and the growth and development of the cow, and observe the characteristics of the cow by walking the cow, observing the appearance of the eyes, and whether the nose is wet and the feces are normal. Preliminary judgment of health status; if necessary, the veterinarian should be consulted for diagnosis. The severely ill cattle should not be purchased, and small diseased cattle must be cured and then fattened. (7) Opinion evaluation In general, shelf cows have different membrane conditions due to their nutritional status, and can be judged by naked eye observation and actual touch. Mainly pay attention to the fullness of the ribs, spine, cross, lumbar and hip muscles. If the bone marrow is obviously exposed, then the sensation is in the middle and lower grade; if the bone marrow is not obvious, but the feel is more moderate; if the feel is not Obviously, it indicates that the muscles are full, and it is the middle and upper grade.
Whitening Ingredient
Whitening supplements usually refer to nutritional supplements or food ingredients that can help improve uneven skin tone, reduce dark spots, and enhance skin brightness, thus achieving whitening effects. These components usually work by antioxidants, inhibiting melanin production, promoting melanin breakdown, or accelerating epidermal metabolism.
Here are some common whitening supplements:
1. Vitamin C (Ascorbic acid)
A powerful antioxidant, can inhibit tyrosinase activity, reduce melanin production, while promoting collagen synthesis, improve skin quality.
2. Glutathione
It is an endogenous antioxidant that can be used orally or topically to help reduce pigmentation and improve skin brightness.
3. Niacinamide (vitamin B3)
It can prevent the transfer of melanin to the skin surface, reduce the formation of stains, and has anti-inflammatory and moisturizing effects, improve skin barrier function.
4. Lipoic acid
A powerful antioxidant that can work with other antioxidants such as vitamins C and E to enhance the whitening effect.
5. Arbutin
Natural extract, can inhibit tyrosinase activity, reduce melanin production, commonly found in whitening skin care products.
6. Polyphenols (such as green tea extract, grape seed extract)
With antioxidant properties, can prevent skin damage caused by ultraviolet light, indirectly help whitening.
7. Collagen peptide
Although the direct whitening effect is limited, it can improve the elasticity and water retention of the skin, making the skin look fuller and brighter.
It is important to note that the effectiveness of whitening supplements varies from person to person, and usually requires a combination of good sun protection and reasonable lifestyle habits (such as adequate sleep, balanced diet, moderate exercise) to achieve the best results. When choosing a whitening supplement, it is recommended to consult a professional to ensure safety and suitability.
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