Automação do manejo alimentar de Bijupirá (Rachycentron canadum)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Strategies to minimize heat stress in broilers chickens

The objective of this study was to evaluate the application of early age thermal conditioning (TC) and dietary electrolyte balances (DEB) to minimize the effect of heat stress. A total of 240 Cobb 500 1-d-old male broiler chicks was randomly allocated to 24 floor pens with six replicates per treatment in a 2x2 factorial arrangement (with and without TC and with and without DEB). Dietary treatments consisted: (T1) a traditional diet without TC; (T2) traditional diet with TC; (T3) with the application of dietary electrolyte and without TC and (T4) application of dietary electrolyte with TC. The thermal conditioning was conducted at 5 d of age (36°C for 24 h), only half of the batch (120 birds). After this period, all birds were transferred to boxes of 1.5 x 3m (10 birds / box), with wood shavings reused as litter. Chicks were exposed to chronic heat stress (32°C) for 6 h from 35 to 39 d of age, in all treatments, being electronically monitored the temperature and humidity of the microclimate of the birds. Feed and water were provided ad libitum, even during periods of stress. Were measured performance data (weight gain, feed intake and feed conversion) and mortality rate. Data were subjected to ANOVA using the GLM procedures of SAS. The results of this study demonstrated no interaction effects of all evaluated parameters (performance and mortality). Therefore, no synergism occurred when both strategies (TC and DEB) were applied. Only the first week there was prejudice on broiler performance with the application of the TC and apparently the technique of early age thermal conditioning no improve the resistance of broilers to chronic heat stress. On the other hand, DEB had significantly favorable effects (P<0.05) on performance and minimized mortality immediately after application of the TC.

Efeitos do uso de programas de luz e de triptofano suplementar na dieta sobre o desempenho, comportamento e parâmetros de estresse de leitões recém-desmamados

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Utilização do sistema de bioflocos na larvicultura de Tilápia-do-Nilo

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Desempenho de bovinos cruzados terminados em confinamento e qualidade dos músculos longissimus e semitendinosus in natura e maturados

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Milho, amido ou caroço de algodão associados à glicerina bruta em dietas para ovinos

Pós-graduação em Zootecnia - FCAV

Goma de soja na alimentação de frangos de corte: digestibilidade e desempenho

Pós-graduação em Ciência e Tecnologia Animal - FEIS

Níveis de fósforo em dietas para Zebrafish Danio rerio

Pós-graduação em Zootecnia - FMVZ

Duração da eclosão e temperatura de incubação sobre a qualidade dos pintos, seu desempenho e qualidade de carne

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Glutamina e nucleotídeos na dieta de frangos de corte criados no sistema alternativo

The experiment was conducted to evaluate the effect of supplementing glutamine and nucleotides on growth performance and development intestinal morphology in broiler chicks. In the trial, 600 male broiler chicks distributed in randomized blocks in a 3x2 factorial arrangement (consisting of a uniform basal diet supplemented with: 0.0, 0.5 or 1.0% glutamine, and 0.0 or 0.04% nucleotides), for a total of 6 treatments with 25 birds each. Means of performance (weight, weight gain, feed intake, feed conversion and mortality) were obtained 7, 21 and 42 days of age. At the end of the experiment 4 broilers per treatment were used to determine organs weight and development intestinal morphology. Glutamine supplementation (1%) improved the body weight, feed intake and feed conversion in the first week. Glutamine and nucleotides supplementation did not affect performance in broiler chicks in the period one to 21 and one to 42 days of age. In conclusion, it was demonstrated that feeding 1.0% glutamine improved growth performance of broiler birds at 21 days of age.

Glutamina na dieta de poedeiras leves submetidas ao estresse pelo calor e à termoneutralidade

The aim of this study was to evaluate the effect of glutamine supplementation of the diet on intestinal mucosa morphology, performance, and egg quality of commercial laying hens, submitted to heat stress and thermoneutral conditions. In this study, 96 (Isa Babcock) laying hens at 35 weeks of age were used and distributed in a completely randomized design according to a 2x2 factorial arrangement, with two levels of ambient temperature (thermoneutral and hot) and two levels of glutamine in the diet (0.0 and 1.0% of inclusion), in 6 replicates of 4 hens per box. Feed intake, daily egg production, feed conversion per kilogram of eggs, and egg quality were obtained in two periods of 28 days each. Heat stress decreased egg production and quality, and glutamine supplementation improved egg quality and feed conversion. The heat and glutamine supplementation provided an increase in calliciform cells quantity in duodenum and ileum, respectively. Significant morphological modifications in the intestinal mucosa of laying hens were not found.

Yuca ensilada como fuente de energía para cerdos en crecimiento

Se condujeron dos experimentos para determinar el comportamiento de cerdos en crecimiento, comparando la dieta de maíz-soya con otra de raíz de yuca ensilada con agua o vinaza. Se utilizaron 16 cerdos de cruce comercial alojados en corrales individuales, mediante clasificación simple y dos tratamientos con ocho repeticiones/ tratamiento. En el segundo trabajo se utilizaron 16 animales en similares condiciones, con vinaza para ensilar. No fueron encontradas diferencias significativas para la ganancia diaria (g) y conversión alimentaria (kg kg-1). Se concluye que la raíz de yuca ensilada con agua y yogurt o vinaza, puede sustituir totalmente la energía del maíz para cerdos en crecimiento.

Desempenho de caprinos de três genótipos recebendo somatotropina bovina recombinante (rbST)

Forty-three animals of three genotypes, wich 13 Alpine (8 males and 5 females), 9 ½ Boer + ½ Alpine (4 males and 5 females) e 21 ¾ Boer + ¼ Alpine (11 males and 10 females), wich 21 received rbST and 22 control.The growth hormone used was the bovine recombinant somatotropin (rbST) and the animals of treatment 1 received the hormone in the adjusted amount from 0,3 mg/kg of live weight in intervals of 14 days. Animals of treatment 2 (control) had received saline solution in the same dosage and interval. There was no influence of the recombinant bovine somatotropin in the evaluated characteristics of performance. Males had been higher to females in weight gain of application of hormone to 120 days of age, as well as in daily average weight gain of 60 to 90, 90 to 120 and of application to 120 days of age. Weight to 90 and 120 days of age of females had been smaller in relation to males.

Ácido fumárico e quelato de cálcio e fósforo na ração de leitões desmamados

Two experiments (E) were carried out with the objective of evaluating the effects of fumaric acid and carbo-amino-fosfo-quelato of calcium diets of weaned pigs on performance (E1) and intestinal morphology (E2). A total of 96 and 32 pigs with initial mean weights of 5,66 kg ± 0,44kg and 5,34 ± 0,45kg , in E1 and in E2, were used respectively. Randomized block designs were used in both experiments, with a 2 X 2 factorial arrangement in E1 and a 2 X 2 X 2 factorial arrangement in E2. No interaction between acidifier, source of calcium and phosphorus were found for the variables studied in the two experiments. No treatment effects were found on daily feed intake in evaluating periods. Feed conversion from 0 to 17 days was better (P<0.05) when inorganic sources of Ca and P were fed; however, no difference was observed in other periods. The averages of villus height (AV), crypt depth (PC), AV: PC relationship and mucous membrane of the duodenum and of the jejunum didn’t differ among treatments. Considering the total nursery period, no benefit was found in using an acidifier, however the carbo-amino-fosfo-quelato of calcium studied may replace the inorganic sources in the diets of piglets, with no damage to performance and to intestinal morphology.

Desempenho e características dos dejetos produzidos por cabritos em diferentes idades e alimentados com diferentes proporções entre volumoso e concentrado

This study was conducted to evaluate the performance and characteristics of manure produced by Saanen goats with 90, 120 and 150 days of age and fed three diets, diets 1 = 80 % roughage (R) and 20 % concentrate (C), diets 2 = 60 % R and 40 % C, diets 3 = 40 % R and 60 % C. Were evaluated 24 goats (divided into three groups according to diet ) during the fattening stage, making up the collection of waste at 90, 120 and 150 days of age to quantify the mass of manure produced each day, beyond the content of N, P, K, Ca, Mg, Na, Fe, Cu, Zn and Mn. The animals were weighed weekly and during the collection of waste is evaluated the digestibility of DM, CP and NDF, in addition to the estimate of feed conversion and rate of waste. The best results of feed conversion coefficient of waste and the apparent digestibilities of DM, CP and NDF occurred at the age of 150 days and in animals fed diets containing higher proportions of concentrate. Insofar as the increased age of the animal and level of concentrate in the diets were verified higher production of faeces. All nutrients were also affected, with higher concentrations occurred in the feces of animals at 150 days old and fed with diet 40% R and 60% C.