Two experiments were conducted using direct method to determine the standardized ileal phosphorus (P) digestibility coefficient (SIPDC) of meat and bone meal (MBM) and poultry byproduct meal (PBM) for broilers. In the first experiment, three MBM from different batches were evaluated, with four treatments (MBMI, MBMII, MBMIII, and a P-free diet) and nine replicates of seven birds each, totaling 252 birds distributed across a completely randomized design. The P-free diet was used to determine endogenous P losses. Titanium dioxide [...] ABSTRACT Two experiments were conducted using direct method to determine the standardized ileal phosphorus (P) digestibility coefficient (SIPDC) of meat and bone meal (MBM) and poultry byproduct meal (PBM) for broilers. In the first experiment, three MBM from different batches were evaluated, with four treatments (MBMI, MBMII, MBMIII, and a P-free diet) and nine replicates of seven birds each, totaling 252 birds distributed across a completely randomized design. The P-free diet was used to determine endogenous P losses. Titanium dioxide

The objective of the present study was to evaluate the effects of xylanase and probiotic supplementation on the performance, carcass characteristics, intestinal pH, intestinal viscosity, and ileal microbiota of broiler chickens fed diets containing wheat bran. The study animals were kept in metal cages, and the study was performed using a completely randomized design, with four treatments, six birds per treatment, and six replicates. The four treatments included a control group, a probiotic-supplemented group, a xylanase-supplemented group, and a [...] ABSTRACT The objective of the present study was to evaluate the effects of xylanase and probiotic supplementation on the performance, carcass characteristics, intestinal pH, intestinal viscosity, and ileal microbiota of broiler chickens fed diets containing wheat bran. The study animals were kept in metal cages, and the study was performed using a completely randomized design, with four treatments, six birds per treatment, and six replicates. The four treatments included a control group, a probiotic-supplemented group, a xylanase-supplemented group, and a

Five experiments were conducted to estimate the digestible threonine requirements of slow-growing broilers: experiment 1, starter phase (days 10 to 28); experiment 2, grower I phase (days 29 to 49); experiment 3, grower II phase (days 50 to 69); experiment 4, finisher phase (days 70 to 84); and experiment 5, which was specifically conducted to determine the production of intestinal mucin over two periods (days 50 to 69 and 70 to 84). Different birds were used in all experiments. A completely randomized design with five treatments and four replicates was used. Treatments consisted of increasing the values of digestible threonine in the diet through basal feed supplementation with L-threonine (98.5%), which was added instead of cornstarch. The following values of digestible threonine were investigated: 0.622, 0.697, 0.772, 0.847, and 0.922% in experiment 1; 0.586, 0.662, 0.738, 0.814, and 0.890% in experiment 2; 0.570, 0.640, 0.71, 0.780, and 0.850% in experiments 3 and 5; and 0.520, 0.595, 0.670, 0.745, and 0.820% in experiments 4 and 5. The digestible threonine values presented quadratic effects on feed conversion ratio in experiments 1, 2, and 3. Digestible threonine values of 0.628 and 0.609% resulted in higher villus height and greater duodenal crypt depth, respectively. Digestible threonine values of 0.762, 0.767, and 0.733% may be recommended for the starter, grower I, and grower II phases, respectively, based on the best feed conversion ratio. In addition, a digestible threonine level of 0.694% may be recommended for the finisher phase based on the highest production of intestinal mucin.

O objetivo deste trabalho foi estudar diferentes métodos reprodutivos em aves de duas linhagens semipesadas e avaliar seus efeitos sobre os processos de incubação artificial dos ovos e do rendimento de carcaça dos pintainhos. O delineamento experimental foi inteiramente casualisado em esquema fatorial (2 x 2) com os fatores: métodos reprodutivos (inseminação artificial e monta natural) e duas linhagens semipesadas (Plymouth Rock Barrada e Rhode Island Red). Foram utilizadas 26 matrizes (23 fêmeas e 3 machos) para cada fator que originaram 62 ovos cada, totalizando 248 ovos, sendo cada ovo uma repetição. Os ovos foram pesados antes e após o período de incubação para determinação da perda de peso e realização de análise comparativa entre o peso do ovo e o peso do pinto. Durante o período de incubação foi avaliado o desempenho reprodutivo das matrizes, e após o nascimento, foram abatidos 8 pintos de cada fator para análise do rendimento de carcaça dos mesmos. Não foram encontradas diferenças significativas (P>0,05) entre o desempenho reprodutivo e a relação entre o peso do pinto e o peso do ovo. O peso do saco vitelino e peso do fígado foram afetados (P

A atual estrutura alimentar global para animais enfrenta desafios de eficiência e sustentabilidade devido à competição por recursos entre rações animais e alimentos destinados ao consumo humano. Ingredientes convencionais, como milho e farelo de soja, que dominam a dieta de aves, apresentam altos custos e significativo impacto ambiental, especialmente na Amazônia, onde esses produtos são ainda mais onerosos. Este estudo tem como objetivo apresentar um panorama das aplicações de subprodutos amazônicos na alimentação de aves de produção, explorando seus efeitos produtivos e econômicos. Ingredientes regionais, como mandioca, tucumã, açaí e buriti, mostram-se promissores devido ao seu valor nutricional, competitividade econômica e viabilidade como substitutos parciais dos insumos convencionais. Estudos indicam que esses subprodutos contribuem para uma produção mais circular e sustentável, reduzindo a pressão sobre terras aráveis e a dependência de recursos externos. Conclui-se que o uso de subprodutos amazônicos na avicultura não apenas reduz os custos de produção, mas também atende à crescente demanda por produtos mais naturais e de menor impacto ambiental. Assim, a exploração de ingredientes regionais consolida-se como uma estratégia viável e sustentável para a avicultura, promovendo uma economia local mais resiliente e ecologicamente responsável.

This study evaluated the effects of in ovo caffeine supplementation on hatchability, embryonic mortality, thermodynamic parameters, plasma biochemical profile, and gastrointestinal morphology in broiler embryos. A total of 200 fertilized eggs were distributed into five groups: control (untreated), saline solution (0.5%), and caffeine solutions at 0.5%, 1.0%, and 1.5%. The results showed a significant decrease in hatchability and an increase in embryonic mortality with higher caffeine concentrations, suggesting osmotic and metabolic imbalances. Plasma biochemical analysis revealed that moderate caffeine levels (0.5%) positively influenced protein metabolism, while higher doses disrupted lipid and protein homeostasis. Thermodynamic parameters indicated a quadratic response, with intermediate caffeine levels favoring thermal regulation. Gastrointestinal morphology showed enhanced liver and yolk sac growth at moderate caffeine levels, but excessive doses led to intestinal structural alterations. These findings suggest that in ovo caffeine supplementation at 0.5% may offer metabolic benefits without compromising embryonic development. However, higher concentrations have adverse effects, highlighting the need for dose optimization in poultry nutrition.