The design of the feed formulation can be performed with the help of a calculator's hand algorithm or a computer algorithm, in which the hand algorithm with the help of a calculator is more common, and there are commonly used trial and error methods and crossover methods. The trial-and-error method is a kind of feed ratio design method most often adopted in rural areas. It can be used for the calculation of various nutrient indicators in feed without being limited by the types of raw materials. In addition, this method is simple and easy to learn, without the use of sophisticated equipment, only the use of pens and pencils, calculators can be calculated formula, is very suitable for rural farmers to calculate the ratio of full-price feed and concentrated feed. The inadequacy of this method is that the calculation amount is relatively large, and it is necessary to match out the full-price compound feed that meets the requirements. Generally, it takes many trials and calculations to be blind, and the investment time and effort are relatively large.
The method of trial and error method matching: First, according to the experience, the approximate proportion of various raw materials is calculated, and then the respective proportion is multiplied by the percentage of various nutrients contained in the kind of raw materials, and then the same kind of nutrition of various raw materials. The sum of the ingredients is summed to obtain the total content of each nutrient ingredient of the formula; if the result is compared with the standard of feeding, if any nutrient component is insufficient or exceeds, the corresponding raw materials can be adjusted and recalculated until It's quite close to feeding standards.
The specific steps of the trial method feed ratio:
1. Determine the feeding object before the feed ratio, and further determine the feeding standard.
2. According to feeding standards, select the raw materials that can be used, and determine the nutrient content in the nutrient composition table.
3. Formulate the formula. Under normal circumstances, energy demand and protein content are two important indicators of full-price compound feed. In the complete feed for grow-finishing pigs, the energy demand and protein content accounts for about 98% of the total feed. Therefore, before formulating a formula, it is necessary to determine the relationship between energy demand and protein in compound feeds. In general, the energy demand and protein content indicators are designed to 96%, which leaves about 4% of other minerals or additives added. Using this method to formulate formulas can meet the requirements of energy demand and protein content in feed, and supplement minerals, amino acids and trace elements additives in an appropriate amount, which can effectively avoid the simultaneous calculation of multiple indicators.
After the formulation is formulated, repeated calculations can be performed to compare the results with the feeding standards in detail, and adjustments are made until the results are close to the feeding standards.
4. Supplement minerals. In the process of mineral supplementation, the amount of phosphorus supplementation should be considered first, because the addition of adequate amounts of phosphorus in the phosphorus element must also contain sufficient amounts of calcium. After adding phosphorus, it is easier to calculate calcium. For the addition of salt content can be calculated according to feeding standards, generally do not consider the content of feed.
5. Supplemental amino acid supplements. Finally, the addition of amino acids can be determined according to the amount of demand. Generally, in the formulation of an aniseed material with corn, soybeans, etc. as the main raw material, the amount of amino acids added can be determined according to the feeding standards, and how much is added. The additives that can be used for amino acid supplementation are lysine and methionine additives. Therefore, in the calculation, it is only necessary to determine the addition ratio of the two amino acids.
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