Avaliação de ácidos orgânicos em dietas para leitões de 21 a 49 dias de idade

Abstract

RESUMO -Objetivou-se estudar os efeitos da proporção crescente de ácidos orgânicos na dieta sobre o desempenho e a incidência de diarréia em leitões no período de 21 a 49 dias de idade. Os tratamentos foram constituídos de uma dieta basal e três dietas suplementadas com 0,78; 0,84; e 0,90% (21 a Effects of feeding organic acids for piglets from 21 to 49 days oldABSTRACT -The effects of feeding increasing dietary organic acids on performance and diahrrea incidencefor piglets from 21 to 49 days old were evaluated. The treatments were constituted of a basal diet and three groups supplemented with 0.78, 0.84 and 0.90% of organic acids in the 21 to 35 days period and 0.59, 0.63 and 0.66% in the 36 to 49 days period, basedoin lactic acid. Average daily feed intake (ADFI), average daily weight gain (ADWG), feed:gain ratio (F/G) and diarrhea scores were evaluated. The ADFI and the ADWG did not differ among the organic acids proportions in the evaluated periods. The FCR of piglets fed diet with 0.84% of organic acids was better than those fed basal and 0.90% diets, in the 21 to 35 days period.The piglets fed diet with 0.84% of organic acids showed lower diarrhea score than those fed 0.9 %. Blood samples were collected to dose lactic acid concentration in plasma of piglets at 35 days old. The plasma lactic acid concentration of the animals fed diet with 0.90% of acid increased 60.61% in relation to the basal diet. Bacterias were isolated from animals feces to microorganisms identification. The 0.84 and 0.63% organic acids proportion, in the period form 21 to 35 days and from 36 to 49 days old, respectively, were more efficient considering that the E. coli a-hemolytic and Streptococcus sp bacterias was not isolated. The 0.84% organic acids level in the piglet diets provide better F/G in the period from 21 to 35 days old and better diarrhea score and E. coli a-hemolytic and Streptococcus sp control supplementing 0.84% of acids in the period from 21 to 35 days old and 0.63% from 36 to 49 days.

Microencapsulated acids associated with essential oils and acid salts for piglets in the nursery phase

“…The frequency of diarrhea was lower in piglets that received mixed acids than in the control group, which corroborates observations made by Freitas et al (2006). However, contrary to the results obtained herein, Corassa et al (2012), who examined the effects of citric and sorbic acid, and Miguel et al (2011), who examined diets containing different organic acids (potassium diformiato, fumaric acid, citric acid, or benzoic acid), found that supplementation with these acids in the diet did not improve symptoms of diarrhea compared with the control.…”

“…Specifically, we observed that including a blend of microencapsulated organic and inorganic acids in the diet had an effect on Salmonella that was similar to that of chlortetracycline in the control 6 and 14 days after contamination. Moreover, Freitas et al (2006) observed that a blend of lactic, acetic and phosphoric acids at proportions of 0.84% and 0.63% from 21 to 35 and 36 to 49 days of age, respectively, efficiently controlled the bacterial populations, as evidenced by a lack of E coli and Streptococcus spp. Commercial product containing 10% phosphoric acid.…”

“…Differences were only detected in the flow of the jejunum, and the highest pH was observed in response to the control diet. Freitas et al (2006) studied a blend of organic acids (levels of 0, 0.78, 0.84 and 0.90%) in the diet of piglets between 21 and 35 days of age and found that these treatments did not reduce the stomach pH of animals. These findings corroborated those of Braz et al (2011), who studied a blend of propionic acid, acetic acid, formic acid, citric acid and calcium, and Gomes et al (2011), who studied diets containing fumaric acid or combination with lactic acid or calcium propionate or combination of the three acids, for weaned piglets.…”

Mananoligossacarídeos, ácidos orgânicos e probióticos para leitões de 21 a 49 dias de idade

“…Para Menten (2001) os probióticos atuam pelos mecanismos de exclusão competitiva, antagonismo direto, estímulo ao sistema imune, efeito nutricional, supressão da produção de amônia e neutralização de enterotoxinas. Por sua vez os ácidos orgânicos (ou seus sais), tem reduzido a freqüência de diarréia e melhorado o desempenho de leitões, pois expressam atividade antimicrobiana no estômago uma vez que o ácido não-ionizado se difunde através da membrana da bactéria e em seu interior, dissocia-se causando acidificação do citossol comprometimento da atividade celular e morte da bactéria (Freitas et al, 2006).…”

Acidificantes como alternativas aos antimicrobianos melhoradores do desempenho de leitões na fase de creche

“…A freqüência de diarréia foi observada diariamente, pela manhã, de acordo com os seguintes escores: 1-fezes duras; 2-fezes normais; 3-fezes pastosas; 4-fezes líquidas (FREITAS et al, 2006). Apenas os escores 3 e 4 indicavam a ocorrência de diarréia, dessa maneira, pôde-se calcular a porcentagem de dias com ocorrência de diarréia nos períodos de 1 a 14 e 1 a 34 dias de experimentação…”