Metabolizable energy equivalence of guanidinoacetic acid in corn soybean meal-based broiler diets

In this study, we evaluated how guanidinoacetic acid (GAA) addition in diets with various metabolizable energy (ME) contents affects the performance of broiler chickens. We also estimated the equivalence of GAA in ME. We distributed 1,280 one-day-old broilers in a completely randomized design with eight treatments, eight replicates, and twenty birds per experimental unit. Treatments were based on ME levels (2,775-2,875-2,975 kcal/kg; 2,850-2,950-3,050 kcal/kg; 2,925-3,025-3,125 kcal/kg; or 3,000-3,100-3,200 kcal/kg, from 1 to 7, 8 to 21, and 22 to 42 days of age) and the inclusion of GAA (0 or 600 mg/kg). Supplementation of GAA increased weight gain in broilers at an energy level of 2,908 kcal/kg and improved feed conversion ratio (FCR) at energy levels of 2,908 and 2,983 kcal/kg. There was a linear reduction in feed intake and an improvement in FCR of broilers with increasing levels of energy in diets, with and without GAA addition. Solving the equivalence equation, by applying each of the weighted average energy levels studied. indicates the GAA equivalence of 133, 103, 74, and 44 kcal/kg of diet. In conclusion, GAA supplementation improves broilers' efficiency of energy use; the average ME equivalence of 600 mg/kg of GAA is 88.5 kcal/kg.

Purified lignin supplementation on the performance and antioxidant status of broilers subjected to cyclic heat stress

The objective of this study was to evaluate the effects of dietary supplementation of purified lignin on the performance, relative organ weights, serum metabolites, and gene expression profiles of broiler chickens subjected to cyclic heat stress (HS). At 22 days old, 280 broilers were distributed in a completely randomized design with four treatments, ten repetitions, and seven birds per experimental unit. The birds were subjected to daily cyclic HS. A high temperature of 32±1 °C was maintained for 10 h/day (08:00­18:00 h), while a temperature of 22±1 °C was maintained for the remaining time. Treatments were a basal diet or basal diet with the addition of 5, 10, or 15 g of purified lignin/kg of diet. Data were analyzed using one-way ANOVA and means were compared by Tukey's test at 0.05 significance. There was no effect of lignin supplementation on performance, carcass yield, relative weights of the bursa, spleen, and liver, or serum levels of glucose, triglycerides, uric acid, malondialdehyde, triiodothyronine, or tetraiodothyronine. The abundance of mRNA of heat shock protein 70, nuclear factor-κB, glutathione peroxidase, and Cu,Zn-superoxide dismutase in the liver was similarly unaffected by treatments. Purified lignin supplementation does not improve performance or the antioxidant response of broiler chickens subjected to HS.(AU)

Capsaicinoids affect intestinal mRNA expression of genes related to oxidative stress in broilers

This study was conducted to evaluate the effects of dietary supplementation with capsaicinoids on the performance and gene expression of broilers. At 18 days of age, 120 male broilers chickens (Cobb 500) were distributed in a completely randomized design with three treatments, eight replicates, and five birds per experimental unit. The treatments were a basal diet or basal diet with the addition of 1 or 2 mg of capsaicinoids/kg of diet. The birds had free access to water and feed throughout the experimental period (18 to 26 days of age). Broiler performance was evaluated at 26 days of age, and one bird per experimental unit was selected to collect serum and jejunum samples. Jejunum samples were used to analyze the mRNA content. Data were analyzed using one-way ANOVA, and the means were compared with Tukey's test at a significance of 0.05. There was no effect of capsaicinoid supplementation on performance, serum metabolites, or the expression of glutathione peroxidase mRNA in the jejunum of broilers. However, broilers supplemented with capsaicinoids showed a higher mRNA expression of Cu, Zn-superoxide dismutase and a reduced mRNA expression of nuclear factor-κB in the jejunum. Supplementation with 1 and 2 mg/kg capsaicinoids did not improve the performance of broilers from 18 to 26 days of age but increased the mRNA expression of Cu, Zn-superoxide dismutase and reduced the mRNA expression of nuclear factor-κB in the jejunum of broilers.(AU)

Broiler feed formulated with phosphorus, calcium, and energy deficiencies supplemented with exogenous enzymes / Rações para frangos formuladas com deficiências de fósforo, cálcio e energia suplementada com enzimas exógenas

Three experiments were carried out to verify the effects of the enzyme phytase, alone or combined with an enzyme complex, in diets deficient in available phosphorus (AP), calcium (Ca), and metabolizable energy (ME) on broiler performance, ME, and dietary amino acid digestibility. A total of 1,538 male Cobb 500 broilers were allocated to the three experiments, each of which consisted of five treatments: positive control (PC; basal ration); negative control 1 (NC1; PC minus 0.15% of AP, 0.16% of Ca, and 68 kcal kg-¹ ME); negative control 2 (NC2; PC minus 0.15% of AP, 0.16% of Ca, and 101 kcal kg-¹ of ME); NC1 plus phytase; and NC2 plus phytase plus enzymatic complex. Body weight gain (WG) and feed intake were measured from 1-21 days and from 1-42 days, and the corrected feed conversion rate (FCR) for mortality was calculated. In the second and third experiments, the apparent ME corrected for nitrogen balance (AMEn) and standar dizeddigestibility of amino acids, respectively, were determined, for the diets supplemented with phytase and the enzymatic complex. In the first experiment, enzyme supplementation increased (p 0.05) AMEn. In the third experiment, both enzyme treatments improved (p < 0.05) the digestibility of amino acids in the supplemented diets compared to the deficient diets. Supplementation with phytase and carbohydrases preserves the performance of broilers fed diets deficient in AP, Ca, and ME and improves amino acid digestibility.

Três experimentos foram conduzidos para determinar o efeito da enzima fitase, sozinha ou associada a um complexo enzimático, em dietas de milho-farelo de soja deficientes em fósforo disponível (Pd), cálcio (Ca) e energia metabolizável (EM) no desempenho de frangos de corte, valores de EM e digestibilidade de aminoácidos da dieta. Para ambos os experimentos, 1.538 frangos Cobb 500 machos foram alocados em 5 tratamentos: controle positivo (CP, ração basal), controle negativo 1 (CN1, CP menos 0,15% de Pd,0,16% Ca e 68 kcal kg-¹ EM), negativo controle 2 (CN2, CP menos 0,15% de Pd, 0,16% de Ca e 101 kcal kg-¹ de ME em relação à dieta CP), CN1 mais fitase (CN1 + F) e CN2 mais fitase mais complexo multi enzimático(CN2 + F + E). O ganho de peso corporal e o consumo de ração foram medidos de 1 a 21 dias e de 1 a 42 dias, e a taxa de conversão alimentar (CA) corrigida para mortalidade foi calculada. No segundo e terceiro experimentos, foram analisados os valores de energia metabolizável aparente corrigida para o balanço de nitrogênio (EMAn) e digestibilidade estandardizada de aminoácidos, respectivamente, em adição à fitase e ao complexo enzimático. No primeiro experimento, a suplementação enzimática aumentou (P 0,05) os valores de EMAn. No terceiro experimento, ambos os tratamentos enzimáticos melhoraram (P < 0,05) a digestibilidade dos aminoácidos nas dietas experimentais, em comparação com as dietas deficientes. A suplementação de fitase e carboidrases preserva o desempenho de frangos alimentados com dietas deficientes em Pd, Ca e EM e melhora a digestibilidade dos aminoácidos.

Broiler feed formulated with phosphorus, calcium, and energy deficiencies supplemented with exogenous enzymes / Rações para frangos formuladas com deficiências de fósforo, cálcio e energia suplementada com enzimas exógenas

Three experiments were carried out to verify the effects of the enzyme phytase, alone or combined with an enzyme complex, in diets deficient in available phosphorus (AP), calcium (Ca), and metabolizable energy (ME) on broiler performance, ME, and dietary amino acid digestibility. A total of 1,538 male Cobb 500 broilers were allocated to the three experiments, each of which consisted of five treatments: positive control (PC; basal ration); negative control 1 (NC1; PC minus 0.15% of AP, 0.16% of Ca, and 68 kcal kg-¹ ME); negative control 2 (NC2; PC minus 0.15% of AP, 0.16% of Ca, and 101 kcal kg-¹ of ME); NC1 plus phytase; and NC2 plus phytase plus enzymatic complex. Body weight gain (WG) and feed intake were measured from 1-21 days and from 1-42 days, and the corrected feed conversion rate (FCR) for mortality was calculated. In the second and third experiments, the apparent ME corrected for nitrogen balance (AMEn) and standar dizeddigestibility of amino acids, respectively, were determined, for the diets supplemented with phytase and the enzymatic complex. In the first experiment, enzyme supplementation increased (p < 0.05) WG at 21 days and 42 days relative to the negative controls. Phytase inclusion improved (p < 0.05) FCR at the initial phase compared to the NC1 diet. In the second experiment, enzyme supplementation did not affect(p > 0.05) AMEn. In the third experiment, both enzyme treatments improved (p < 0.05) the digestibility of amino acids in the supplemented diets compared to the deficient diets. Supplementation with phytase and carbohydrases preserves the performance of broilers fed diets deficient in AP, Ca, and ME and improves amino acid digestibility.(AU)

Três experimentos foram conduzidos para determinar o efeito da enzima fitase, sozinha ou associada a um complexo enzimático, em dietas de milho-farelo de soja deficientes em fósforo disponível (Pd), cálcio (Ca) e energia metabolizável (EM) no desempenho de frangos de corte, valores de EM e digestibilidade de aminoácidos da dieta. Para ambos os experimentos, 1.538 frangos Cobb 500 machos foram alocados em 5 tratamentos: controle positivo (CP, ração basal), controle negativo 1 (CN1, CP menos 0,15% de Pd,0,16% Ca e 68 kcal kg-¹ EM), negativo controle 2 (CN2, CP menos 0,15% de Pd, 0,16% de Ca e 101 kcal kg-¹ de ME em relação à dieta CP), CN1 mais fitase (CN1 + F) e CN2 mais fitase mais complexo multi enzimático(CN2 + F + E). O ganho de peso corporal e o consumo de ração foram medidos de 1 a 21 dias e de 1 a 42 dias, e a taxa de conversão alimentar (CA) corrigida para mortalidade foi calculada. No segundo e terceiro experimentos, foram analisados os valores de energia metabolizável aparente corrigida para o balanço de nitrogênio (EMAn) e digestibilidade estandardizada de aminoácidos, respectivamente, em adição à fitase e ao complexo enzimático. No primeiro experimento, a suplementação enzimática aumentou (P <0,05) o ganho de peso (GP) aos 21 dias e 42 dias em relação aos controles negativos. A inclusão de fitase melhorou (P < 0,05) a taxa de conversão alimentar na fase inicial, em comparação com a dieta CN1. No segundo experimento, a suplementação enzimática não afetou (P > 0,05) os valores de EMAn. No terceiro experimento, ambos os tratamentos enzimáticos melhoraram (P < 0,05) a digestibilidade dos aminoácidos nas dietas experimentais, em comparação com as dietas deficientes. A suplementação de fitase e carboidrases preserva o desempenho de frangos alimentados com dietas deficientes em Pd, Ca e EM e melhora a digestibilidade dos aminoácidos.(AU)

Xylanase and B-glucanase in maize- and soybean meal-based diets for broilers / Xilanase e B-glucanase em dietas a base de milho e de farelo de soja para frangos de corte

The objective of this study was to evaluate the effect of adding different xylanase and β-glucanase enzyme blends to maize- and soybean meal-based diets on performance and energy metabolizability in broilers. Two experiments were carried out with broilers of the COBB 500 strain. In the first experiment, 1960 chicks were assigned to a completely randomized design with a 2 × 3 + 1 factorial arrangement, totaling seven treatments, namely, T1- Positive control (PC); T2 - Negative control 1 (NC1; PC minus 200 kcal kg-¹ ME); T3 - NC1 + Blend A; T4 - NC1 + Blend B; T5 - Negative control 2 (NC2; PC minus 167 kcal kg-¹ ME and 5% amino acids); T6 - NC2 + Blend A; and T7 - NC2 + Blend B. Fourteen replicates were used per treatment and 20 birds per experimental unit. The parameters evaluated at 21 and 42 days of age were weight gain (WG), feed intake (FI) and feed conversion (FC). At 42 days, production efficiency index (PEI), viability and the yields of cuts were also calculated. Birds that received diets with a reduced nutritional value showed a reduction in WG and PEI and worsened FC as compared those of PC treatment (p 0.05) from 1 to 21 days of life. For the yield of thigh + drumstick, the factors were statistically similar (p > 0.05) to those observed in the PC birds. In the second experiment, 432 fourteen-day-old chicks were distributed in a completely randomized design with seven treatments, with eight replicates per treatment and six birds per experimental unit. The apparent metabolizable energy (AME) and nitrogen-corrected AME (AMEn) values were determined. Overall, the NC2 diet with Blend B provided the highest AME and AMEn values; however, NC1 with the same enzyme blend was the treatment which provided the lowest values. The addition of xylanase [...].

Objetivou-se avaliar o efeito da adição de diferentes blends enzimáticos de xilanase e β-glucanase em dietas a base de milho e de farelo de soja sobre o desempenho e metabolizabilidade da energia para frangos de corte. Foram realizados dois experimentos com frangos de corte da linhagem COBB500. No primeiro experimento, foram utilizados 1960 pintos distribuídos em delineamento inteiramente casualizado em arranjo fatorial 2 x 3 + 1, totalizando sete tratamentos: T1- Controle Positivo (CP); T2- Controle negativo 1 (CN1; CP menos 200 kcal Kg-¹ de EM); T3 - CN1 + Blend A; T4 - CN1 + Blend B; T5 - Controle negativo 2 (CN2; CP menos 167 kcal Kg-¹ de EM e 5% de aminoácidos); T6 - CN2 + Blend A e T7 - CN2 + Blend B. Foram utilizadas 14 repetições por tratamento e 20 aves por unidade experimental. Os parâmetros avaliados aos 21 e aos 42 dias de idade dos frangos foram o ganho de peso (GP), o consumo de ração (CR) e a conversão alimentar (CA). Aos 42 dias calculou-se o índice de eficiência produtiva (IEP), viabilidade (VIAB) e rendimento de cortes. Foi observado que as aves que receberam dietas com reduzido valor nutricionais apresentaram redução no GP e IEP e piora na CA comparadas ao CP (p 0,05) no período de um a 21 dias de vida. Para o rendimento de coxa mais sobrecoxa (RCS), foi possível observar que os fatores apresentaram estatisticamente (p >0,05) semelhantes ao CP. No segundo experimento foram utilizados 432 pintos com 14 dias de idade, distribuídas em um delineamento inteiramente casualizado com sete tratamentos com 8 repetições por tratamento e 6 aves por unidade experimental. Foram determinados os valores de energia metabolizável aparente (EMA) e aparente corrigida para balanço de nitrogênio (EMAn). Em geral, a dieta CN2 como Blend B apresentou o maior valor de EMA e EMAn, porém, [...].

Xylanase and B-glucanase in maize- and soybean meal-based diets for broilers / Xilanase e B-glucanase em dietas a base de milho e de farelo de soja para frangos de corte

The objective of this study was to evaluate the effect of adding different xylanase and β-glucanase enzyme blends to maize- and soybean meal-based diets on performance and energy metabolizability in broilers. Two experiments were carried out with broilers of the COBB 500 strain. In the first experiment, 1960 chicks were assigned to a completely randomized design with a 2 × 3 + 1 factorial arrangement, totaling seven treatments, namely, T1- Positive control (PC); T2 - Negative control 1 (NC1; PC minus 200 kcal kg-¹ ME); T3 - NC1 + Blend A; T4 - NC1 + Blend B; T5 - Negative control 2 (NC2; PC minus 167 kcal kg-¹ ME and 5% amino acids); T6 - NC2 + Blend A; and T7 - NC2 + Blend B. Fourteen replicates were used per treatment and 20 birds per experimental unit. The parameters evaluated at 21 and 42 days of age were weight gain (WG), feed intake (FI) and feed conversion (FC). At 42 days, production efficiency index (PEI), viability and the yields of cuts were also calculated. Birds that received diets with a reduced nutritional value showed a reduction in WG and PEI and worsened FC as compared those of PC treatment (p < 0.05). However, the birds that consumed the NC2 diet with Blend B exhibited a similar WG to those in PC group (p > 0.05) from 1 to 21 days of life. For the yield of thigh + drumstick, the factors were statistically similar (p > 0.05) to those observed in the PC birds. In the second experiment, 432 fourteen-day-old chicks were distributed in a completely randomized design with seven treatments, with eight replicates per treatment and six birds per experimental unit. The apparent metabolizable energy (AME) and nitrogen-corrected AME (AMEn) values were determined. Overall, the NC2 diet with Blend B provided the highest AME and AMEn values; however, NC1 with the same enzyme blend was the treatment which provided the lowest values. The addition of xylanase [...].(AU)

Objetivou-se avaliar o efeito da adição de diferentes blends enzimáticos de xilanase e β-glucanase em dietas a base de milho e de farelo de soja sobre o desempenho e metabolizabilidade da energia para frangos de corte. Foram realizados dois experimentos com frangos de corte da linhagem COBB500. No primeiro experimento, foram utilizados 1960 pintos distribuídos em delineamento inteiramente casualizado em arranjo fatorial 2 x 3 + 1, totalizando sete tratamentos: T1- Controle Positivo (CP); T2- Controle negativo 1 (CN1; CP menos 200 kcal Kg-¹ de EM); T3 - CN1 + Blend A; T4 - CN1 + Blend B; T5 - Controle negativo 2 (CN2; CP menos 167 kcal Kg-¹ de EM e 5% de aminoácidos); T6 - CN2 + Blend A e T7 - CN2 + Blend B. Foram utilizadas 14 repetições por tratamento e 20 aves por unidade experimental. Os parâmetros avaliados aos 21 e aos 42 dias de idade dos frangos foram o ganho de peso (GP), o consumo de ração (CR) e a conversão alimentar (CA). Aos 42 dias calculou-se o índice de eficiência produtiva (IEP), viabilidade (VIAB) e rendimento de cortes. Foi observado que as aves que receberam dietas com reduzido valor nutricionais apresentaram redução no GP e IEP e piora na CA comparadas ao CP (p < 0,05), porém as aves que consumiram a dieta CN2 com o Blend B, que apresentaram GP semelhante ao CP (p > 0,05) no período de um a 21 dias de vida. Para o rendimento de coxa mais sobrecoxa (RCS), foi possível observar que os fatores apresentaram estatisticamente (p >0,05) semelhantes ao CP. No segundo experimento foram utilizados 432 pintos com 14 dias de idade, distribuídas em um delineamento inteiramente casualizado com sete tratamentos com 8 repetições por tratamento e 6 aves por unidade experimental. Foram determinados os valores de energia metabolizável aparente (EMA) e aparente corrigida para balanço de nitrogênio (EMAn). Em geral, a dieta CN2 como Blend B apresentou o maior valor de EMA e EMAn, porém, [...].(AU)

Effects of dietary nucleotide supplementation on growth performance and physiology of broiler chickens under pre- and post-inflammatory challenge

The objective of this study was to evaluate the effects of dietary nucleotide supplementation on growth performance, serum immunoglobulin G (IgG) and uric acid levels, immune-related organs, and intestinal morphometric parameters of broiler chickens under pre- and post-inflammatory challenge with lipopolysaccharide (LPS). Ninety-six seven-day-old male broiler chicks were randomized in a 2×2 factorial design composed of two dietary types (supplemented with 0 and 0.3 g of purified nucleotides/kg of feed) and two inflammatory conditions (with and without LPS administration) with eight replicates per treatment and three birds per cage. The experimental period was divided into two phases: 7-20 days of age (pre-LPS challenge) and 21-35 days of age (post-LPS challenge). Data were analyzed using one-way and two-way ANOVA for the pre- and post-challenge phases, respectively. During the pre-challenge phase, dietary nucleotide supplementation improved body weight (982 vs. 1009 g/bird), daily weight gain (58.1 vs. 60.1 g/bird), feed conversion rate (1.28 vs. 1.25 g/g), and serum concentration of IgG (1.17 vs. 1.76 mg/mL) of broilers. During the post-challenge phase, nucleotide supplementation increased serum IgG of broilers at 28 days of age (3.01 vs. 4.34 mg/mL). For the intestinal morphometric parameters, nucleotide supplementation increased villus height (299.3 vs. 315.6 µm). Dietary nucleotide supplementation improves the performance of broilers from seven to 20 days of age (pre-LPS challenge). However, from 21 to 35 days of age, supplementation of 0.3 g of purified nucleotides/kg of feed, independent of inflammatory challenge, does not contribute to improve performance of broilers. Additionally, nucleotide supplementation increases IgG production and villus height in the jejunum of broilers.(AU)