Because there are many kinds of chickens and their sizes and production performance are different, so far there is no complete information on nutritional requirements. The average age of listed chickens is 13 to 16 weeks, but white broilers only need 6 to 8 weeks. Due to the long growing season of hybrid chicken, dietary energy and protein and other nutrient concentrations can be lower than white broilers.
When formulating diet formulas, it is necessary to consider: 1 the nutritional requirements of the chicken; 2 the nutrient composition of the feed ingredients; 3 the feed price and source; 4 the characteristics of the feed ingredients. In general, trace minerals and vitamins can be purchased as commodity minerals and premixed vitamin feeds. Therefore, energy, protein, amino acids, salt, calcium, and phosphorus are important in formulating feed formulations, while salt is added quantitatively by approximately 0.3%. The research data on the nutrient requirements of hybrid chickens in soil are also based on energy, essential amino acids composed of protein and protein, and calcium and phosphorus. In common practical ground chicken diets, sulfur-containing amino acids are more likely to be lacking, so methionine should be added. According to its growth stage, chickens are divided into brooding period, growing period and fattening period. The nutritional requirements of chickens vary according to their growth stages.
1. The brooding diet needs to contain metabolisable energy 13.02-13.44 MJ/kg, protein 22%-23%, calcium 0.79%-0.85%, available phosphorus 0.4%-0.46%, sulphur amino acid 0.91%-0.94%, lysine 1.08 Write 0.2% tryptophan.
2. During the growth period, the diet needs to contain 11.76 to 13.02 MJ/kg of metabolizable energy, 17% to 20% of protein, 0.66% to 0.72% of sulfur-containing amino acids, 0.7% to 0.75 of calcium, and 0.3% to 0.4% of available phosphorus.
3. Fertility diets need to contain 12.6 to 13.02 MJ/kg of metabolizable energy, 17% to 18% of protein, 0.55% to 0.56% sulphur amino acids, 0.75% to 0.8% calcium, and 0.2% to 0.25% available phosphorus.
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