2008
DOI: 10.1590/s1516-635x2008000200006
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Abstract: Two experiments were carried out to assess the efficacy of plant extracts as alternatives for antimicrobial growth promoters in broiler diets. The performance experiment included 1,200 male broilers raised from 1 to 42 days of age. The metabolism experiment used 96 male broilers in the grower phase housed in metabolic cages for total excreta collection. At the end of the metabolism experiment, 24 birds were sacrificed to assess organ morphometrics. In both experiments, the following treatments were applied: co… Show more

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Cited by 101 publications
(61 citation statements)
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References 17 publications
(61 reference statements)
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“…Furthermore, Jamroz et al (2003) reported that herbs and spice extracts have appetite-and digestion-stimulating properties and antimicrobial effects. In contrast, other authors have reported non-significant effects of plant extracts on broiler feed intake and general bird performance (Boutsoglou et al, 2002;Lee et al, 2003a;Barreto et al, 2008). According to Lee et al (2003a), the absence of effects on bird performance may be related to the composition of the basal diet and to the environmental conditions of the experiment.…”
Section: Resultsmentioning
confidence: 88%
“…The discrepancy in this result merits further study. Non-significant effects of plant extract on carcass yield have been reported by various authors (Hernández et al, 2004;Barreto et al, 2008;Aguilar et al, 2013).…”
Section: Resultsmentioning
confidence: 92%
“…In the period of 1 to 21 days ( by Barreto et al (2008), who did not verify any difference in broilers intake when assessing diets containing cinnamon, clove, oregano and pepper extracts, in addition to a control treatment and another with avilamycin addition.…”
Section: Resultsmentioning
confidence: 99%
“…No significant effects (P>0.05) were observed with the addition of the herbal extracts on apparent metabolizable energy (AME) and apparent metabolizable energy corrected by nitrogen balance (AMEn) ( Table 7 -Dry matter and energy values of experimental diets expressed on an as fed basis obtained by Lee et al (2003) and Barreto et al (2008), in which no significant differences were found with the addition of extracts containing carvacrol, capsaicin, cinnamaldehyde, thymol, or even avilamycin in the diet. This fact could be attributed to the supply of highly-digestible diets to the animals, in which the increase in digestibility would be almost imperceptible (Barreto et al, 2008). Besides, since the birds utilized in the experiment were in the phase of 14-24 days of age, all their digestive and enzymatic system was developed, hampering the improvement in digestibility through stimulation to increase of the endogenous enzymatic synthesis.…”
Section: Resultsmentioning
confidence: 99%
“…Tais resultados podem ter ocorrido devido à boa qualidade sanitária do ambiente experimental, que não ofereceu desafio. Como descrito em estudos anteriores, é preciso haver elevada pressão de infecção do ambiente para que a atividade antimicrobiana dos extratos vegetais e seus princípios ativos fiquem evidentes (BARRETO et al, 2008;FUKAYAMA et al, 2005;JESUS, 2007;TOLE-DO et al, 2007).…”
Section: Resultsunclassified