Possibilidade do uso de Mexilhão Dourado contaminado com metais tóxicos em dietas para frangos de corte

Brazilian poultry farming occupies a prominent position in the world scenario and there is a need for this production to occur in a sustainable way, so the nutrition of these animals must be carried out in a way that causes the least possible environmental impact. In front of it, the calcareous shells of the golden mussel, an invading mollusk that occupies a large part of the freshwater rivers of South America, arise and are responsible for generating large environmental impacts. The high content of calcium present in the golden mussel makes it a potential food with the capacity to replace calcitic limestone in broiler diets, but its feeding habit makes it possible to contain contents of toxic metals such as cadmium (Cd) and lead (Pb) that are contained inside the mussel can cause contamination of the chickens and consequently of the food products derived from them.A avicultura brasileira ocupa posição de destaque no cenário mundial e existe a necessidade de que esta produção ocorra de forma sustentável, sendo assim a nutrição destes animais deve ser realizada de forma que provoque o menor impacto ambiental possível. Frente ao exposto surgem as conchas calcárias do mexilhão dourado que é um molusco invasor que ocupa grande parte dos rios de água doce da América do Sul e é responsável por gerar grandes impactos ambientais. O alto teor de cálcio (Ca) presente no mexilhão dourado faz com que este seja um potencial alimento com capacidade de substituir o calcário calcítico em dietas de frangos de corte, porém o seu hábito alimentar filtrador faz com que este possa conter teores de metais tóxicos como o cádmio (Cd) e o chumbo (Pb) que se contidos no interior do mexilhão podem causar contaminação dos frangos e conseqüentemente também dos produtos alimentícios derivados destes

Carboidrases e coproduto da mandioca na alimentação de frangos de corte: revisão

Resumo - Na industrialização da mandioca (Manihot esculenta Crantz) é gerado um coproduto denominado resíduo seco de fecularia (RSF) que pode ser utilizado como alimento energétco alternativo. O RSF caracteriza-se por apresentar em sua composição elevado teor de amido, fibras e baixos teores de lipídeos, proteínas e matéria mineral. Ao utlizar esse ingrediente nas formulações de rações para aves torna-se necessário, além do conhecimento da composição bromatológica, considerar a presença de fatores antinutricionais em sua composição. Alguns componentes encontrados no RSF como fibras solúveis e insolúveis, polissacarídeos não amiláceos e compostos cianogênicos são apontados como responsáveis por afetarnegativamente o desempenho dos animais. Neste contexto, enzimas carboidrases têm sido utilizadas com o propósito de disponibilizar maior quantidade de nutrientes no alimento, na tentatva de melhorar ou manter o desempenho dos animais e com isso a sua rentabilidade. Xilanase, β-glucanase e α-amilase são algumas das enzimas exógenas utilizadas em dietas, contendo RSF, para minimizar seus compostos indigestíveis.Abstract -Industrialization of cassava (Manihot esculenta Crantz) generates a coproduct called dry residue of cassava (DRC) that can be an alternative energy for broiler feed. DRC has a high content of starch, fibers and low levels of lipids, proteins and mineral mater. However, when it is used for poultry feed formulation is necessary to consider the bromatological composition as well as the presence of antinutritional factors in its composition. Some components found in the DRC such as soluble and insoluble fibers, non-starch polysaccharides and cyanogenic compounds are said to be responsible for negatively affectng animal performance. In this context, carbohydrase enzymes have been used for the purpose of providing more nutrients in the feed, in an attempt to improve or maintain the performance of the animals and thus their profitability. Xylanase, β-glucanase and α-amylase are some of the exogenous enzymes used in diets containing DRC to minimize their indigestible compounds

Fitase e seus efeitos extra fosfóricos em dietas para frangos de corte: revisão

Broiler`s diets are mainly composed of plant origin products, where most of the phosphorus (P) is in the unavailable form, called phytate. The phytate molecule and the nutrients attached to it cannot be absorbed in the digestive tract without enzymatic degradation by the phytases. Phytases hydrolyze phytate in one molecule of inositol and six inorganic phosphate molecules reducing their antinutritional effects. The magnitude of phytase response may be more significant with increasing inclusion levels and phytate degradation correlates with large increases in P retention, tibia ash concentration, weight gain, feed intake, feed efficiency, retention of nitrogen, apparent metabolizable energy and Ca retention. Therefore, this review has the objective of to characterize phytase and to address aspects related to its efficacy and its extra phosphoric effects in diets for broilers.As dietas para aves são compostas principalmente por produtos de origem vegetal, em que a maior parte do fosforo (P) se encontra na forma indisponível, denominada fitato. A molécula de fitato e os nutrientes ligados a ela não podem ser absorvidos no trato digestivo sem degradação enzimática realizada pelas fitases. As fitases hidrolisam o fitato em uma molécula de inositol e seis moléculas inorgânicas de fosfato reduzindo os seus efeitos antinutricionais. A magnitude da resposta da fitase pode ser mais significativa com o aumento dos níveis de inclusão e a degradação do fitato se correlaciona com grandes aumentos na retenção de P, concentração de cinzas na tíbia, ganho de peso, consumo de ração, eficiência alimentar, retenção de nitrogênio, energia metabolizável aparente e retenção de Ca. Por isso, esta revisão tem o objetivo de caracterizar a fitase e abordar os aspectos relacionados na sua eficácia e seus efeitos extra fosfóricos em dietas para frangos de corte

Dry brewery residue in broiler chickens feed

The residual from the food industry has the potential to replace the traditional ingredients used in animal feed, and the dry brewery residue (DBR) may be an alternative for this purpose. This study aimed to evaluate the use of DBR in the diets of broiler from 22 to 42 days of age. Five hundred and forty-six male broilers were used, with an initial average weight of 865 ± 8 g. The animals were distributed in a completely randomized design, with six levels of DBR inclusion (0, 2, 4, 6, 8, 10%), seven replicates and thirteen animals per experimental unit (EU). Weight gain (WG), average feed intake (AFI) and feed:gain ratio were evaluated. At 42 days of age, blood samples were collected from two broilers of each EU, and one broiler per EU was slaughtered to investigate the intestinal development. DBR interposed the WG and promoted a linear effect in this variable from 22 to 42 days of age. This effect was not observed for AFI. The inclusion of DBR interfered with the serum cholesterol values, showing a quadratic influence at the maximum response for the inclusion of 4.96%. However, the blood parameters of triglycerides, uric acid, creatinine, aspartate aminotransferase, alanine aminotransferase and total protein remained unchanged, regardless of the level of dietary DBR. No changes in villus height and crypt depth were observed by intestinal morphometric evaluation. The inclusion of 10% DBR can be used in a poultry diet, without any damage to the performance, metabolism and development of the broilers

Possibility of using Golden Mussel contaminated with toxic metals in diets for broilers

Brazilian poultry farming occupies a prominent position in the world scenario and there is a need for this production to occur in a sustainable way, so the nutrition of these animals must be carried out in a way that causes the least possible environmental impact. In front of it, the calcareous shells of the golden mussel, an invading mollusk that occupies a large part of the freshwater rivers of South America, arise and are responsible for generating large environmental impacts. The high content of calcium present in the golden mussel makes it a potential food with the capacity to replace calcitic limestone in broiler diets, but its feeding habit makes it possible to contain contents of toxic metals such as cadmium (Cd) and lead (Pb) that are contained inside the mussel can cause contamination of the chickens and consequently of the food products derived from them

AVALIAÇÃO NUTRICIONAL E ENERGÉTICA DA SOJA INTEGRAL DESATIVADA PARA AVES

Chemical composition, energy values, digestibility coefficients and the values of true amino acid of eight different deactivated full-fat soybeans were determined. The total excreta collecting method was used to determine the energy values, where 180 broiler chicken, aging 21 days, were distributed in a completely randomized design, with nine treatments (eight soybeans and one reference diet), four replicates, and five birds per experimental unit. The method of “forced feeding” was used to determine the digestibility coefficients, where 40 cecectomized roosters were distributed in a completely randomized design, with eight treatments, five replicates and one rooster per experimental unit five cockerels were fasted to determine endogenous losses. The values for apparent metabolizable energy (AME), nitrogen corrected AME (AMEn), and coefficients of metab-olizability (CAME and CAMEn) for the soybean, ranged respectively, from 3.191 to 4.242 kcal/kg, 2.953 to 3.906 kcal/kg, 64.85 to 80.42% and 60.00 to 74.07%. The average values of true digestibility coefficients of essential and nonessential amino acids from soybeans evaluated ranged from 79.74 to 93.08% and from 78.33 to 91.85%, respectively. The soybean one (deactivated organic) showed the lowest digestible coefficients com-paring to the others (obtained commercially), probably due to a subprocess, confirmed by the urease activity of 0.32

Resíduo seco de fecularia na alimentação de frangos de corte suplementados ou não com carboidrases

The objective of this study was to evaluate the inclusion of dry residue of cassava (DRC) with or without supplementation of carbohydrases on performance, carcass yield, cuts and organs, blood parameters and meat quality of broiler chickens. Birds were distributed in a completely randomised design in a 2 x 5 factorial scheme, with or without addition of carbohydrases and five levels of DRC inclusion, resulting in 10 treatments with 5 replicates of 22 birds each. At 21 days of age, two birds of each treatment were fasted for 6 hours for blood brachial puncture. At 42 days, four birds per pen were slaughtered to determine carcass yield, cuts, organs, percentage of abdominal fat and meat quality. Between 1-21 days of age, there was an interaction (P 0.05) by DRC inclusion and carbohydrase addition. However, cooking loss was influenced (P 0.05) by DRC levels and carbohydrase addition. The colour variable b* showed a decrease (P 0,05) pela inclusão do RSF e adição ou não de carboidrases. A perda por cocção foi influenciada (P0,05) pelos níveis do RSF e adição ou não de carboidrases. A variável de cor b* apresentou um decréscimo (P<0,05) a partir do nível de 5% de inclusão. O RSF pode ser utilizado nas dietas de frangos de corte de 1 a 21 dias de idade até o nível avaliado de 10%, desde que associado ao uso de carboidrases

Effect of oral dietary supplement for chicks subjected to thermal oscillation on performance and intestinal morphometry

The aim of the study was to evaluate the efficacy of a nutritional formulation based on amino acids and vitamins supplemented in the drinking water for chicks in the first week of life subjected to thermal oscillation on performance, organ development and intestinal morphometry from 1 to 21 days. 640-male broiler chicks were distributed in a 2x2 factorial completely randomized design (with or without dietary supplementation and at comfort temperature or thermal oscillation). Chicks subjected to thermal oscillation presented worse performance (p < 0.05) than those under thermal comfort of 1 to 7, 1 to 14 and 1 to 21 days. Nutritional supplementation did not alter the performance (p < 0.05) of the birds, but resulted in a higher body weight (p < 0.05) regardless of the environmental thermal condition. At 7 days, chicks under thermal comfort had better intestinal morphometric parameters (p < 0.05), in relation to birds under thermal oscillation. In conclusion, the temperature oscillations caused negative consequences to the productive performance and the intestinal morphology of chicks for which dietary supplementation was not enough to mitigate the effects of the environmental challenge during the first week of life of the birds.