In the production of growing pig compound premix feed, precisely controlling the amount of various vitamins added is a core element in ensuring healthy pig growth and improving breeding efficiency. Vitamins, as essential micronutrients for growing pigs, are required in small amounts but play an irreplaceable role in metabolism, immune function, and growth and development. The accuracy of their addition requires comprehensive consideration of multiple dimensions, including pig breed, growth stage, physiological state, feed composition, and environmental factors, achieved through scientific formula design, raw material quality control, and processing technology optimization.
The breed and growth stage of growing pigs are the basis for adjusting vitamin addition. Different breeds of pigs have different metabolic efficiencies. For example, Duroc-Landrace-Large White crossbred pigs and local breeds may have different vitamin absorption and utilization rates, requiring targeted formula adjustments. At the same time, growing pigs are in a rapid weight gain phase, and their vitamin requirements are significantly higher than those of finishing pigs, especially fat-soluble vitamins such as vitamins A, D, and E, and water-soluble B vitamins. The addition ratio needs to be dynamically adjusted according to the growth rate to meet the needs of bone development, protein synthesis, and energy metabolism.
The composition of the growing pig compound premix feed has a significant impact on vitamin addition. The natural vitamin content in a basal diet is significantly affected by the type of raw materials, processing methods, and storage conditions. For example, plant-based raw materials such as corn and soybean meal are low in vitamins A and D, while animal-based raw materials such as fish meal and meat and bone meal are rich in vitamin B12. If the vitamin content in the basal diet is sufficient, the amount of the corresponding vitamin added to the premix can be appropriately reduced; conversely, the supplementation ratio needs to be increased. In addition, the content of minerals, fats, and antioxidants in the feed also affects the stability of vitamins, requiring formulation optimization to reduce potency losses caused by interactions.
Environmental factors and feeding management conditions are important references for adjusting vitamin supplementation. High temperature and high humidity environments accelerate the oxidative decomposition of vitamins, reducing the activity of vitamins in the feed, which needs to be compensated for by increasing the supplementation amount or adding antioxidants (such as ethoxyquin and BHT). Under stress conditions (such as transportation, regrouping, and disease), pigs' vitamin requirements increase significantly, especially for vitamins C, E, and B vitamins, requiring temporary increases in supplementation amount or the addition of electrolytes and multivitamins to alleviate the effects of stress. In addition, stocking density, hygiene conditions, and disease control measures also indirectly affect vitamin requirements, necessitating dynamic adjustments based on actual conditions.
The formulation design of vitamin premixes must adhere to the principle of balancing scientific rigor with economic efficiency. The basic dosage of each vitamin should be determined based on feeding standards, and a safety factor should be set based on production experience and experimental data to ensure that the actual dosage meets the pigs' needs. For vitamins with poor stability (such as vitamin A and vitamin D), the addition ratio should be appropriately increased to compensate for losses during processing and storage; for vitamins that easily react with other components (such as vitamin B1 and vitamin C), their activity should be maintained through separate premixing or the addition of a protective agent (such as sodium carbonate). Simultaneously, vitamin raw materials with high stability and good bioavailability should be selected to avoid affecting the addition effect due to fluctuations in raw material quality.
Optimization of processing technology is a key step in ensuring the accuracy of vitamin addition. The carrier selection for growing pig compound premix feed should consider particle size, bulk density, and adsorption capacity. Commonly used carriers include corn gluten meal and defatted rice bran, with particle size requiring passage through a specific mesh sieve to ensure uniform mixing. The mixing equipment should be a horizontal double-spiral mixer. Uniform distribution is achieved through step-by-step feeding (adding half the carrier first, then gradually increasing the amount of vitamin raw materials, and finally adding the other half of the carrier) and thorough mixing (usually for more than 15 minutes). Temperature, humidity, and time must be controlled during processing to avoid vitamin inactivation due to high temperature and pressure, while also reducing dust generation and ensuring accurate dosage.
Storage and usage management also affect the accuracy of vitamin dosage. Premixes should be stored in a dry, cool, and light-protected environment, with controlled temperature and humidity to prevent vitamin oxidation and decomposition. Once opened, they must be sealed and used as soon as possible to prevent potency reduction. During feed mixing, the premix must be added strictly according to the recommended ratio to avoid insufficient or excessive vitamin addition due to weighing errors or uneven mixing. Simultaneously, the vitamin content in the feed should be tested regularly, and the formula adjusted based on feedback from pig growth performance to form a dynamic optimization mechanism.
