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Effect of differents sources of zinc in diets for sows and piglets


The organic sources of minerals have been studied in pig diets, especially in weaned piglets and pigs during the growing and finishing phase, but the results are variable, mainly due to different sources studied. Still, research on organic sources of minerals for sows are scarce. Thus, considering the importance of zinc in the productive and reproductive performance of sows and performance of piglets will be conducted three experiments to evaluate different sources of zinc in the diet of pigs. The first experiment will study different sources of zinc, organic (zinc + zinc and methionine + glycine) and inorganic (zinc oxide) in the diet of sows in gestation and lactation and the effects of using these sources in their progeny. Will be used 18 females of a commercial strain used in a randomized block design with 3 treatments and 6 repetitions of 1 animal. The characteristics evaluated in sows are: prolificacy, number of piglets born alive and serum levels of zinc in colostrum and milk. For the piglets after birth until weaning will be analyzed: serum zinc levels, weight gain, feed intake and feed conversion rate of diarrhea, villous height, crypt depth and villous height ratio / crypt depth in the duodenum, density of the right tibia. In the second experiment will be used 180 piglets weaned at 21 days of age in a randomized block design in a 3 x 3 (3 maternal diet - fed Zn oxide, Zn-Met, Zn-Glu x 3 diets progeny containing oxide of Zn, Zn-Met, Zn-Gly) totaling 9 treatments and 5 replicates of 4 animals each. In experiment III will be used 168 piglets weaned at 21 days of age in a randomized block design with 7 treatments (1-basal diet without zinc supplementation; 2 - basal diet + 100 ppm Zn from Zn oxide; 3diet basal + 100 ppm Zn from Zn-Met; 4 - basal diet + 100 ppm Zn from Zn-Gly, 5 - basal diet + 200 ppm Zn from Zn oxide, 6 - basal diet + 200 ppm Zn from Zn - Met -, 7 - basal diet + 200 ppm Zn from Zn-Gly) with 6 replicates of 4 animals each. In experiments II and III will be evaluated performance, incidence of diarrhea, blood parameters, bone parameters and intestinal histology. All animals are weighed at the beginning of the experiment (21 days old) at the end of Stage I (35 days), II (49 days) and III (70 days). In all experiments, the data will be analyzed using the SAS (1998). The treatment means are compared by Tukey test at 5% probability, according to Steel and Torrie (1980). (AU)

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