Mineral nutrition of pigs
It has been proved that there are more than 40 kinds of essential mineral elements in pigs, which can be divided into two categories: major elements and trace elements according to their content in pigs. Elements with a content of more than 50 mg / kg are major elements, which are mostly expressed by percentage content; elements less than 50 mg / kg are mostly represented by mg / kg.
Pigs need at least 14 inorganic elements, including major elements calcium (Ca), phosphorus (P), sodium (Na), chlorine (Cl), potassium (K) sulfur (S), magnesium (Mg) and trace elements iron (Fe), copper (Cu), zinc (Zn), manganese (Mn), iodine (I), selenium (Se) and cobalt (Co). In addition, other elements such as arsenic (As), bromine (Br), chromium (Cr), boron (B), cadmium (Cd), fluorine (F), lead (Pb), lithium (Li), molybdenum (Mo), nickel (Ni), silicon (Si, tin (Sn) and vanadium (V) may also be necessary for pigs.
The raw materials of non-mineral feed for pigs generally contain all kinds of mineral elements, but the amount provided by most raw materials can not meet the nutritional needs of pigs. and all kinds of plant raw materials show obvious regional differences due to the influence of growing water, soil, climatic conditions, industrial pollution, breeds, production seasons and harvest time, so minerals and trace elements should be reasonably supplemented according to the local actual conditions.
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Lean cattle grazing and fattening
Grazing fattening cattle is a fattening method based on the use of natural pastures. The grazing and fattening method has the advantages of low feeding cost, good fattening effect and easy to be popularized in the vast agricultural and pastoral areas. During the 150-day grazing and fattening period of lean cattle, the daily gain of local cattle was 0.5ml 0.7 kg, the daily gain of beef hybrid cattle was 0.8ml 1.2 kg, and the total weight gain of each cow was 100ml 180kg, which increased the economic benefit by 300Mel 400 yuan. The techniques of grazing and fattening cattle are introduced as follows. 1. Selection of fattening cattle
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Why is the pig fed with dry material?
Many pig practices have proved that pig feeding lean food will seriously affect digestion and absorption, resulting in dry feces, red eyes, reduced defecation times, intestinal peristalsis weakening, pig growth slow. Thus it can be seen that it is best for pigs to be fed with raw and dry powder, allow pigs to eat freely, and set up a trough for drinking water or heavy feed, with a feed-water ratio of 1 ∶ 1. This can prevent feed from freezing in winter and spoilage in summer, so that pigs can eat full and grow quickly.
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