Pig dung is better black or yellow. What's good about it?

What is the normal color of pig feces? Why should farmers pay attention to fecal color? -- normal is yellow, but after high copper is black-- you should also pay attention to odor to reduce ammonia nitrogen emissions. Protect the environment-you don't have to ask, of course it's yellow. Hey, some people heighten copper and promote growth in some years to make feces. Hey, this is a disadvantage. Now it is foreign pigs that have done a good job of deworming and nutrition, and the effect of high copper on promoting growth is not very effective, but the misconception of promoting growth has been deeply rooted in the hearts of the people. It's not good, actually. Yellow is obviously normal. But many pig owners like their pork chops with black droppings. Normal pig manure is brown, depending on the type of diet. If it is added with alfalfa powder, it is brown. In general, the feces of corn and soybean meal diets are yellow and normal, and some people think that black means good digestion, which is simply nonsense, just because of the role of sulfate in copper sulfate. Farmers are not experts, but it is a pity that many of our so-called experts have been bluffing people all day long-- support ~-- now the Ministry of Agriculture notice No. 1224 has been implemented. Pay attention to those who use high copper again-check and punish. The color of feces should be black to indicate good digestion, which is the misleading of most "experts" to farmers. The less pig manure is, the better the digestion is. -- in the past, education was said to be black, but now it has to be done slowly when education comes back. our industry should strive for human health instead of pursuing appearances.