Avanços metodológicos na avaliação de alimentos e de exigências nutricionais para aves e suínos

Rostagno, Horácio Santiago; Bünzen, Silvano; Sakomura, Nilva Kazue; Albino, L. F. T.

doi:10.1590/s1516-35982007001000027

Cited by 742 publications

(1,444 citation statements)

References 3 publications

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“…Foi utilizada uma dieta basal composta por sorgo de baixo tanino e farelo de soja, a qual continha 2.900kcal de energia metabolizável/kg de ração, 15% de proteína bruta e 0,85% de lisina digestível, suplementada com minerais, vitaminas e aminoácidos, de modo a atender as exigências nutricionais conforme recomendações de Rostagno et al (2005) para aves de reposição semipesadas de uma a seis semanas de idade, exceto para o nível de lisina digestível e proteína (Tab. 1).…”

Section: Methodsunclassified

Lisina digestível em dietas de baixa proteína para frangos de corte tipo caipira de um aos 28 dias

Oliveira¹,

Carrijo

Kiefer

et al. 2013

Arq. Bras. Med. Vet. Zootec.

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RESUMOAvaliou-se a inclusão de diferentes porcentagens de lisina digestível em dietas de baixa proteína para frangos de corte tipo caipira, machos e fêmeas, com idade entre um e 28 dias. Utilizaram-se 792 machos e 792 fêmeas de linhagem comercial, de um dia de idade, distribuídos em delineamento inteiramente ao acaso, em esquema fatorial 2x6 (sexo x porcentagem de lisina digestível: 0,85; 0,90; 0,95; 1,00; 1,05 e 1,10%) com seis repetições de 22 aves. Não foi constatada interação (P>0,05) de sexo versus inclusão de lisina. Observou-se superioridade (P<0,05) dos machos em relação às fêmeas para todas as variáveis avaliadas. O ganho de peso dos frangos diminuiu linearmente (P<0,05) em função do aumento da porcentagem de lisina digestível na dieta e observou-se redução linear (P<0,01) nos consumos de ração e de proteína. O consumo de lisina digestível aumentou linearmente (P<0,01) em função do aumento de sua concentração na dieta. Não houve diferença (P>0,05) para conversão alimentar. Da composição centesimal da carcaça, apenas o percentual de matéria mineral foi influenciada (P<0,05) pela porcentagem de lisina digestível. Conclui-se que 0,85% de lisina para frangos tipo caipira de pescoço pelado atende à exigência nutricional de lisina digestível em dietas com baixa concentração proteica.Palavras-chave: aminoácidos, carcaça, desempenho, frango, sistema semi-intensivo lysine: 0.85, 0.90, 0.95, 1.00, 1.05 and 1.10%) ABSTRACT The inclusion of different percentages of digestible lysine in low-protein diets was evaluated for male and female free-range broiler chickens, from 1 to 28 days. We used 792 female and 792 male naked neck chickens a day in a completely randomized 2x6 factorial scheme (sex x percentages of digestible

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Section: Methodsunclassified

Lisina digestível em dietas de baixa proteína para frangos de corte tipo caipira de um aos 28 dias

Oliveira¹,

Carrijo

Kiefer

et al. 2013

Arq. Bras. Med. Vet. Zootec.

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“…A high-protein summit diet was formulated to contain~1.2 times the digestible MC and THR levels suggested by Rostagno et al (2005) for broilers during the respective phases, and all other essential amino acids were set at a minimum of 1.4 times their suggested levels. These summit diets were diluted sequentially with isoenergetic, protein-free diets (N free) (Fisher and Morris, 1970) (Table 1), to create a range of seven feeds increasing in content of the studied amino acids as shown in Table 2.…”

Section: Experimental Dietsmentioning

confidence: 99%

Manipulation of dietary methionine+cysteine and threonine in broilers significantly decreases environmental nitrogen excretion

Donato

Sakomura

Silva

et al. 2016

Animal

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The intensification of livestock have increased the emission of pollutants to the environment, leading to a growing interest in seeking strategies that minimise these emissions. Studies have shown that it is possible to manipulate diets by reducing CP levels and thus reducing nitrogen (N) excretion, without compromising performance. However, there is no knowledge of any study that has focused on reducing N excretion and relating this reduction to individual amino acids. This study investigated the effect of dietary methionine + cysteine (MC) and threonine (THR), the two most limiting amino acids for broiler production, on nitrogen excretion (NE) and nitrogen deposition (ND) and determined the efficiency of utilisation of both amino acids for protein deposition. Six trials were conducted to measure the NE and ND in broiler chickens during three rearing phases in response to dietary amino acid. The efficiency of utilisation of the amino acids was calculated by linear regression of body protein deposition and the amino acid intake. Despite the differences between sexes and phases, the efficiency of utilisation was the same, being 0.60 and 0.59 for MC and THR, respectively. The rate of NE behaved exponentially, increasing with amino acid intake, and can exceed 50% of N intake, being higher than ND. On average, for a reduction in intake of each unit of MC or THR (mg) there is a reduction of 0.5% of NE. Although this reduction seems low, considering that it corresponds to changes in one amino acid only, the impact on a large scale would be significant. Knowledge of how animals respond to NE and ND/protein deposition according to amino acid dietary content may represent new efforts towards reducing the impact on environment.Keywords: amino acids, efficiency of utilisation, environmental pollution, nutrition, poultry ImplicationsThis study shows the effect of amino acids on nitrogen excretion and deposition and on their efficiency of utilisation for protein deposition by broilers. The nitrogen originating from the poultry is an environmental pollutant. Provision of higher amounts of amino acids, besides not increasing protein deposition, also causes increased nitrogen excretion. Meeting animal's amino acids requirements, provides greater efficiency of utilisation of these amino acids, without affecting protein deposition in the animals, and thus reduces nitrogen excretion. In this way, the management of amino acids in broilers diets may allow new efforts to reduce the impact of intensification of livestock. IntroductionThe intensification of livestock have significantly increased the emission of pollutants to the environment, leading to a growing interest in seeking alternatives that minimise these emissions. The European Union has already implemented laws regulating environmental pollution, especially in regard to the emission of nitrogen (N) compounds, considered to be a critical pollutants affecting life on earth (European Commission, 2007). N compounds are responsible for pollution of groundwater due to nitrate lea...

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“…The feed used (Table 1) containing 19.50% PB and 3,100 kcal, was formulated in accordance with the nutritional requirements for broilers males average performance in growth phase I of 22 to 33 days of age (Rostagno, Albino, Donzele, Gomes, Oliveira, Lopes, Ferreira, de Toledo, Barreto & Euclides, 2011), from the previous phase, in an attempt to encourage compensatory gain with a ration of greater nutritional value than required at the age When they should be getting the feed to the growth phase II, 34 to 42 days. During the trial period, the birds were given rations and water at will.…”

Section: Methodsmentioning

confidence: 99%

Untitled

et al. 2017

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This research was conducted to assess the compensatory gain in birds that have suffered severe food restriction and a reduced growth in its initial phase. A total of 144 birds were used in the Label Rouge lineage with average initial weight 239.90 ± 76.80 g, from 28 to 49 days. The experimental design used was a completely randomized design, where the birds were distributed in 18 boxes, containing 3 treatments and 6 replicates of 8 birds per cage. The treatments were as follows: birds with body weight of 150.73 ± 12.62 g, between weighing from 239.79 ± 13.14 g and heavy weight of 329.17 ± 24.89 g in different periods, from 28 to 35, 35 to 42 and 42 to 49 days of age, respectively. In relation to weight gain, the heavy birds, obtained better results when compared to the other. The feed consumption has changed in the three periods and, in the period of 42 to 49 days, the treatments did not differ among themselves. Feed conversion rates (p = 0.127) and feasibility (p = 0.6163) of birds do not differ in different periods.Keywords: Consumption, feed efficiency, poultry, severe restriction. ResumenEsta investigación se realizó para evaluar la ganancia compensatoria en aves que han sufrido graves restricciones alimenticias y un crecimiento reducido en su fase inicial. Se utilizó un total de 144 aves en el linaje Label Rouge con un peso inicial promedio de 239.90 ± 76.80 g, de 28 a 49 días. El diseño experimental utilizado fue el diseño completamente al azar, en el que las aves se distribuyeron en 18 cajas, con 3 tratamientos y 6 repeticiones de 8 aves por jaula. Los tratamientos fueron los siguientes: aves con peso corporal de 150.73 ± 12.62 g, entre el peso de 239.79 ± 13.14 g y peso de 329.17 ± 24.89 g en diferentes períodos, de 28 a 35, 35 a 42 y 42 a 49 días de edad, respectivamente. En relación al aumento de peso, las aves pesadas, obtuvieron mejores resultados en comparación con el otro. El consumo de alimento ha cambiado en los tres períodos y, en el período de 42 a 49 días, los tratamientos no difirieron entre sí. Los porcentajes de conversión alimenticia (p = 0.127) y de viabilidad (p = 0.6163) de las aves no difieren en diferentes períodos.Palabras clave: Consumo, eficiencia alimentaria, aves de corral, restricción severa.

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Avanços metodológicos na avaliação de alimentos e de exigências nutricionais para aves e suínos

Cited by 742 publications

References 3 publications

Lisina digestível em dietas de baixa proteína para frangos de corte tipo caipira de um aos 28 dias

Lisina digestível em dietas de baixa proteína para frangos de corte tipo caipira de um aos 28 dias

Manipulation of dietary methionine+cysteine and threonine in broilers significantly decreases environmental nitrogen excretion

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