Assessing The Available Phosphorus In Feed Grade Phosphate For Growing Pigs

To assess the available phosphorus in feed grade mineral phosphate for growing pigs, four castrated Large Yorkshires (initially weighing about 3 0kg) were selected at random. P level of the basal diet, based on maize starch, corn gluten, glucose and bone meal, was very low. The experiment, applying the method of substituting maize starch of basal diet, was to determine the digestibility of phosphorus from MCP DCP and Bone meal. The content of Ca and P was controlled respectively at the level of 6.Og/kg and 2.7g/kg in the experiment diet. The other nutrient content arrived the level of pig nutrient requirement. The balance trial was carried out in a 4x4 Latin square experiment design. Four healthy Large Yorkshires was placed in four special-made digestive- metabolic cages and given four kinds of diets by feed limitation in every period. The whole trial was subdivided into four periods. Each period began with an adaptation phase of 7 days and was followed by the main phase of 7 days, during which feces and urine were collected quantitatively Samples of feces and urine were analyzed. After Ca and P availabilities were calculated, the analysis of the relationship of Ca and P availabilities was done. The ratio of Ca and P's absorption quantity was calculated with Ca/AP ranging from 2.6:1 to 2.9:1. The result of the apparent digestibility of phosphorus was as follows: MCP 86.3 8%; DCP,77.93%; Bone meal,74.21%. The analysis of the result shows that there is stranger relationship between the apparent digestibility of Ca and P When the ratio of Ca and AP ranged from 2.6:1 to 2.9:1, the ratio of absorption quantity of Ca and P was proximately 2.0:1.