960 resultados para feed efficiency


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As bactérias acido lácticas tem se destacado por desempenhar efeitos benéficos ao hospedeiro, entre eles destacam-se a ativação no sistema imunológico, desempenho zootécnico e eficiência alimentar. O objetivo deste trabalho foi selecionar e a avaliar bactérias potencialmente probiótica no crescimento e sanidade de Arapaima gigas. A primeira etapa foi o isolamento e seleção de bactérias com potencial probiótico a partir de 10 juvenis de A. gigas sendo submetidas a testes in vitro de inibição de patógenos bacterianos conhecidos para aquicultura, e a segunda etapa consistiu em testes in vivo avaliando a colonização do trato intestinal pela cepa bacteriana e sua relação com a hematologia. A cepa com melhor halo de inibição foi identificada com o kit API50 CH como Lactobacillus paracasei (99.9%). Para avaliação in vivo, os animais foram alimentados durante 120 dias com dieta contendo somente leite estéril (T1), dieta controle sem bactéria (T2), dieta com 105 L. paracasei (T3) e dieta com 106 L. paracasei(T4). Após este período os peixes foram submetidos três tratamentos: injeção intraperitoneal com Aeromonas hydrophila, injeção de solução salina e peixes não injetados. Ao final de 24 horas de desafio foi observado elevada mortalidade dos peixes pertencentes ao grupo T3, T4 em relação ao T1. Os resultados nos permite concluir que a cepa utilizada nos testes in vivo não influenciou o desempenho zootécnico, além de ser ineficaz na proteção contra a infecção por Aeromonas.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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

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Pós-graduação em Zootecnia - FCAV

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The experiment was conducted to evaluate the ingestive behavior of feedlot lambs fed with an exclusive diet of concentrate with different percentages of protein (14, 16, 18, and 20%). A total of twenty four Santa Inês crossbred lambs, not castrated, with approximately 180 days of age, average live weight of 25kg, confined, in a completely randomized design, with four treatments and six repetitions. The time spent on feeding decreased linearly in 0.20 hours/day for each 1% increasing in protein percentage in the diet, the idleness increased linearly in 0.25 hours/day, and the total chewing decreased linearly in 0.25 hours/day. The increase in the protein percentage in the diet increased the feed efficiency linearly (kg DM and NDF/hour) in 0.038 and 0.005kg/hour, respectively, for DM and NDF fractions. However, the intake of dry matter (DM) and neutral detergent fiber (NDF), the rumination efficiency (kg DM and NDF/hour), as well as the period (nº /day) and the time (min) spent on feeding, ruminating and idling were not influenced by different protein percentages in the diet.

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The objective was to evaluate the effect of nutritional density and season on the performance of young rabbit does before the first mating. Forty-eight females from the Botucatu Genetic Group were used in each season (warm or cool), starting at the age of 70 days, housed in groups of four per cage up to 119 days, and reared individually from 120 to 140 days of age. The high-density diet was formulated to contain, on a 90% DM basis, 18.4% CP, 16.5% ADF and 2,500 kcal DE kg-1; whereas the low-density diet was formulated to contain 14.7% CP, 24% ADF and 2,000 kcal DE kg-1. The experiment was conducted according to a 2x2 factorial design (two diets x two seasons) with repeated measures (weeks). The high-density diet promoted lower feed intake, higher final weight, and higher daily weight gain, adjusted for constant intake. But these facts alone do not warrant using a high-density diet for growing rabbit does, because it could have a negative impact during the reproductive phase. In the warm season, there was a reduction in feed intake and an improvement in feed efficiency. Along time, however, the mean body weight of does was similar in the two seasons.

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Pós-graduação em Zootecnia - FCAV

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The present study was conducted to evaluate the effects of feeding whole linseed on the laying performance and egg characteristics in laying hens kept at high ambient environmental temperatures (average 34 degrees C; the diurnal temperature range 26 degrees C to 41 degrees C). Two hundred and forty 38-wk-old white Leghorn laying hens were fed diets containing 0, 5, 10 or 15% whole linseed (as a source of n-3 polyunsaturated fatty acids) for a period of 12 weeks. Egg production was recorded daily, while feed intake and egg characteristics were monitored on weekly basis. The results of the study demonstrated that egg production and feed intake decreased, while feed conversion ratio (FCR) per dozen of eggs increased (p <= 0.05) with increasing dietary linseed levels. Egg weight, yolk weight, albumen height, eggshell weight, and eggshell thickness were not influenced (p > 0.05) by linseed levels in the diets offered to the laying hens. The results of the present trial suggest that feeding linseed to the laying hens in hot climates has no detrimental effects on egg characteristics, but has suppressive effects on egg production, feed intake and feed efficiency of laying hens.

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

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