Moema Pacheco Chediak Matos

Metabolismo do ferro em suínos recebendo dietas contendo fitase, níveis reduzidos de fósforo inorgânico e sem suplemento micromineral e vitamínico

This research was aimed at evaluating the effect of mineral-vitamin supplement withdrawal associated to reduction of inorganic phosphorus level and addition of phytase in feed on iron metabolism of finishing-phase pigs. Erythrocyte and reticulocyte count, serum iron, ferritin and transferrin quantification was performed. Forty eight hybrid swine females with initial average weight of 60kg were allotted to a completely randomized experimental design with six with four replications of two animals each. Blood was drawn from a group of twenty four 100kg animals and from a second group of twenty four 120kg animals. No differences (P>0.05) were observed in erythrocyte and reticulocyte count or serum iron and transferrin quantification. However, ferritin levels were increased in 100kg animals fed basal feed without mineral/vitamin supplement and inorganic phosphorus with phytase when compared to animals fed basal feed without mineral/vitamin supplement with inorganic phosphorus with phytase. The enzyme, even in the absence of supplementation, assured the maintenance of iron reserves in the body. Difference as mentioned above was not detected in 120kg animals. The results of this work suggest that withdrawal of vitamin and mineral supplement combined with reduction of inorganic phosphorus and addition of phytase do not lead to significant changes in iron metabolism.

Diferentes fontes de ferro na prevenção da anemia ferropriva e no desempenho de leitões lactentes

Com o objetivo de avaliar o uso de diferentes fontes de ferro na prevencao da anemia ferropriva e no desempenho em leitoes lactentes, dividiram-se 202 leitoes em cinco tratamentos: FD - aplicacao intramuscular de 200mg de ferro dextrano no terceiro dia de idade; T24 - terra a vontade fornecida aos leitoes a cada 24 horas do terceiro ao 19o dia; T48 - terra a vontade fornecida aos leitoes a cada 24 horas do terceiro ao 10o dia e do 11o ao 19o dia, com intervalo de 48 horas; T72 - terra a vontade fornecida aos leitoes a cada 24 horas do terceiro ao 10o dia e do 11o ao 19o dia, com intervalo de 72 horas; SA - suplemento alimentar ultraprecoce rico em ferro quelatado em po (SAUP) fornecido do terceiro ao 11o dia, com intervalo de 48 horas. O ferro dextrano aplicado no terceiro dia de vida e a suplementacao com terra e SAUP foram eficientes para garantir o desempenho de leitoes no periodo de aleitamento e nao influenciaram no consumo de racao nem na taxa de viabilidade. As diferentes fontes de ferro estudadas nao influenciaram o leucograma e foram eficientes na prevencao da anemia ferropriva e no desempenho dos leitoes lactentes. Com relacao as concentracoes de hemoglobina e hematocrito, os animais suplementados com ferro dextrano apresentaram valores superiores quando comparados aos que recebem terra e SAUP.