This work aimed to investigate the antioxidant capacity of the guava agroindustrial waste as a functional additive in broiler feed to improve the performance and meat quality of boilers. The experiment was conducted in a completely randomized design, consisting of four treatments and six replicates with 12 birds. Treatments included different levels of guava byproduct in the feed: 0, 0.5, 1.0, and 1.5%. We evaluated the performance of broilers at 7 and 21 days old. At 21 days old, two birds from each experimental unit were euthanized for intestine histologic evaluation (duodenum, jejunum, and ileum) and breast and deboned thigh samples were collected for analyzes of pH, colorimetry (L*, a*, and b*), and thiobarbituric reactive substances (TBARS). The use of guava byproduct in the diet at 7 days old did not affect feed intake and feed conversion of the birds. However, the body weight and weight gain increased linearly with the inclusion of the byproduct. At 21 days old, the guava byproduct did not depress the performance of birds. There was no effect of treatments on villus height, crypt depth, and villus:crypt ratio of the duodenum and jejunum of the birds. The inclusion of guava byproduct resulted in lower crypt depth and linear increase in villus:crypt ratio of the ileum. There was no significant difference in pH and colorimetry of the breast and thigh. With increasing inclusion of byproduct, TBARS value was reduced to 0.72%, indicating greater lipid stability in thigh meat in this inclusion amount. Guava byproduct can be used as an alternative antioxidant additive in broiler feed because it does not depress the productive performance and improves thigh meat quality of boilers.
The objective was to determine the digestible tryptophan requirements for male broilers in pre-starter and starter phases. Two experiments using 400 Cobb broilers were performed 200 males in the first experiment for the pre-starter phase (one to seven days old), and 200 males in the second experiment for the starter phase (eight to 21 days old). Chicks were housed in batter boxes made of galvanized steel as an experimental shed. The experiments were performed in a completely randomized design, with four treatments and five replicates, with ten birds each. In both experiments, the tryptophan requirement was determined using diets with different levels of digestible tryptophan. A tryptophan-deficient diet was formulated, as a basal diet, which was supplemented with increased levels of L-tryptophan in order to achieve the desirable digestible tryptophan levels. Treatments consisted of 0.209% (basal diet); 0.223%; 0.235% and 0.248% digestible tryptophan for the pre-starter phase (experiment 1) and 0.187% (basal diet); 0.200%, 0.211% and 0.223% digestible tryptophan for the starter phase (experiment 2). We evaluated feed intake, weight gain and feed conversion, as well as the metabolizability of feed nutrients. The performance and metabolic data were subjected to analysis of variance, and estimates of digestible tryptophan levels were made through polynomial regression models at 5% probability. There was no significant difference between the digestible tryptophan levels in the diet over performance and digestibility in both treatments. It is possible to conclude that the basal diet with 0.209% digestible tryptophan for the pre-starter phase and 0.187% for the starter phase, at a tryptophan: lysine ratio of 16%, as sufficient to meet the broilers requirements. Key words: Animal nutrition. Chickens. Digestible amino acid. Digestibility. Performance. ResumoObjetivou-se determinar as exigências de triptofano digestível para frangos de corte machos nas fases pré-inicial e inicial. Foram realizados dois experimentos utilizando 400 frangos de corte da linhagem Cobb, sendo o experimento 1 com 200 machos para a fase pré-inicial (um a sete dias de idade), e o 1 M.e em Ciência Animal, Escola de Medicina Veterinária e Zootecnia, EVZ, Universidade Federal de Goiás, UFG, Goiânia, GO,Brasil. E-mail: brunozootecnia22@hotmail.com 2 Profs., Pós-Graduação em Zootecnia, EVZ/UFG, Goiânia, GO, Brasil. E-mail: romaocnunes@hotmail.com; jhstring@uol.com. br; alegimenez09@hotmail.com; heloisamello@gmail.com 3 Discentes do Curso de Doutorado em Zootecnia, EVZ/UFG, Goiânia, GO, Brasil. E-mail: julyanamachado_zoo@hotmail.com; raianazoo@hotmail.com; mary_zoo@hotmail.com * Author for correspondence experimento 2 com 200 machos para a fase inicial (oito a 21 dias de idade), alojados em baterias, contendo gaiolas de arame galvanizado, em um galpão experimental. Os experimentos foram realizados em delineamento inteiramente casualizado, divididos em quatro tratamentos, com cinco repetições e dez aves por repetição, sendo que cada repetição com...
Alunas da pós-graduação em Ciências Veterinárias -FAMEV-UFU 4 Zootecnista autônomo ResumoExiste a preocupação com o uso contínuo e indiscriminado de antibióticos na alimentação de aves no sentido dessas substâncias exercerem risco, tanto para a saúde animal quanto humana, pois estes podem causar resistência aos microrganismos patogênicos, além de deixar resíduos em produtos de origem animal, o que é de preocupação para segurança alimentar do consumidor.Dessa forma devido a exigência do mercado consumidor por produtos de qualidade levaram a restrição aos antibióticos administrados na alimentação de aves e as buscas por alternativas como probióticos, prebióticos, simbióticos e aditivos fitogênicos, por proporcionarem condições favoráveis ao desenvolvimento de microrganismos benéficos ao trato gastrointestinal e diminuição do estresse imunológico. Portanto, o presente estudo teve como
RESUMO.A presente revisão de literatura tem como objetivo apresentar como a cana de açúcar é utilizada na recria de novilhas leiteiras. Algumas características relacionadas à cultura da cana de açúcar, tais como a facilidade de seu cultivo, a execução da colheita justamente na época de estiagem, possibilidade de auto armazenamento ou conservação a campo, persistência da cultura e a grande produção obtida em nossas condições tornaramna um alimento de grande interesse dos criadores. Fêmeas em recria necessitam de um ganho de peso que garanta uma idade ao primeiro parto aos vinte e quarto meses de idade. Serão relatados os sistemas de recria de novilhas, os aspectos importantes ligados à nutrição de novilhas, limitações do uso da cana de açúcar para bovinos, composição e a produtividade da cana de açúcar. Os resultados de diferentes trabalhos de pesquisa sugerem várias formas de utilização da cana de açúcar para a obtenção de resultados satisfatórios como a cana in natura, cana com ureia, a silagem de cana, cana hidrolisada e o bagaço da cana de açúcar. Apesar da baixa digestibilidade da cana de açúcar e do menor ganho de peso das novilhas quando comparadas com outros tipos de alimentações como, por exemplo, a silagem de milho, a cana de açúcar mostrou-se ser uma alternativa viável para recria de novilhas leiteiras em propriedades pouco tecnificadas. Palavras chave: Bovinos leiteiros, novilhas, formas de utilização de cana de açúcarSugar cane in feeding of milker heifers: Review ABSTRACT. This review aims to present how sugarcane is used in the rearing of dairy heifers. Some characteristics related about the culture of sugarcane, such as ease of cultivation, implementation of crop in the dry season, the possibility of self-storage or conservation field, persistence of culture and great production obtained in Brazilian conditions They made it a food of great interest to breeders. Females in growing need an average weight gain that guarantees an age at first calving at twenty-four months old. Will be reported the dairy heifer's systems, important aspects of heifers' nutrition, limitations of use of sugarcane for cattle, composition and productivity of sugarcane. The results of different research papers suggest several ways of using sugarcane to obtain satisfactory results as in natural cane, cane with urea, silage cane, hydrolyzed cane and bagasse from sugarcane. Despite the low digestibility of sugarcane and less weight gain for heifers as compared to other feeds, for example, silage corn, sugarcane proved to be a viable alternative for rearing dairy heifers little technicality properties.
SUMMARY The aim of this study was to evaluate the guava extract as an antioxidant additive in diets of Japanese quail breeders on the performance and egg’s quality. The experiment was conducted at University Federal of Goias. A total of 384 Japanese quail breeders were used, distributed in four treatments, with six replicates, with a total of 12 females and four males in each replicate. The treatments were performed with four levels of guava extract in the diets (0.0%, 0.3%, 0.6% and 0.9%). The guava extract contained the ellagic acid, considered the guava antioxidant active principle. The diets were isonutritive. Feed and water were offered ad libitum. The experimental period was 84 days. Egg production, feed intake, feed conversion ratio, egg mass, body weight variation and egg quality were evaluated. The results were submitted to analysis of variance and regression analysis. The adopted probability was 5%. Egg production, feed intake, feed conversion ratio and egg mass were not influenced by the use of guava extract. The yolk and albumen height, the Haugh Unit and the yolk and albumen index decreased linearly as the levels of guava extract in the diet increased. The diameter of the albumen was higher with the use of 0.48% of guava extract in the diet. The yolk color was affected by the guava extract, presenting a darker color with 0.50% of guava extract in the diet. It was concluded that the guava extract used as an antioxidant additive does not improve the performance and egg quality of Japanese quails.
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