Comparison between the effects of inorganic and chelated micromineral premix on the performance of starting, growing-finishing pigs
2010
Reyes, C.B.
An experiment was conducted to determine the effects of supplementing diets with inorganic trace mineral premix or with different levels of chelated trace mineral premix on the performance of starter, grower-finishing pigs. Twenty four starter pigs, 12 males and 12 females, were assigned to four treatments following a completely randomized design. The diets were supplemented with inorganic trace premix based on the recommendation of NRC (1998) for treatment 1, while treatments 2, 3 and 4 were supplemented with half the minimum, minimum and twice the minimum recommended level of chelated trace mineral premix. Trace mineral supplementation of the diets using inorganic or chelated mineral premix did not affect the performance and carcass characteristics of pigs in all stages of growth, except for bone yield. Liver retention of zinc was significantly higher in pigs fed diets supplemented with inorganic trace mineral premix. Manganese and iron content of the liver were not affected by form and level of minerals used. Pigs fed diets with inorganic trace mineral premix had significantly higher liver copper content compared to those fed diets with minimum and twice the minimum level of chelated trace mineral premix but not from those fed diet supplemented with half the minimum recommended level. Retention of Manganese in metacarpal bone did not differ significantly between those fed diets with inorganic and with chelated trace mineral premixes. Bone zinc was significantly higher in pigs fed diets with half the minimum recommended levels of trace mineral premix compared to other treatments. Retention of iron was significantly higher in pigs fed diets supplemented with half the minimum recommended level of chelated trace mineral premix compared to pigs fed diets with inorganic trace mineral premix and with twice the minimum recommended inclusion of chelated trace mineral premix. With copper, pigs fed diet supplemented with the minimum recommended level of chelated trace mineral premix had significantly higher bone copper content compared to pigs fed diets with inorganic trace mineral premix. Pigs fed diets with inorganic trace mineral premix had significantly higher fecal excretion of trace minerals compared to those fed diets with different levels of chelated trace mineral premix. Significant increase in trace mineral excretion was observed as the level of chelated trace mineral premix was increased. In this study, supplementation of the diets with inorganic trace mineral premix was economically beneficial in terms of feed cost per kilogram gain in weight.
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