The effects of various dietary levels of phytase and available phosphorus on performance of laying hens

Boling, S. D.; Douglas, M. W.; Shirley, R. B.; Parsons, C. M.; Koelkebeck, K. W.

doi:10.1093/ps/79.4.535

Cited by 61 publications

(33 citation statements)

References 5 publications

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“…Gordon & Roland (1997) e Boling et al (2000), em experimento no qual não consideraram a matriz nutricional da fitase, também não observaram diferenças significativas para a porcentagem de postura em poedeiras comerciais alimentadas com rações contendo níveis reduzidos de fósforo disponível (Pd) em até 78% (0,10% de Pd) e com fitase em relação às aves alimentadas com a ração testemunha (0,45% de Pd).…”

Section: Resultsunclassified

“…Esse fato se deve, principalmente, à diminuição de 51% na quantidade de fosfato bicálcico incluída na formulação das dietas quando valorizada a matriz fítica, ou seja, a quantidade de fósforo fítico que a fitase teoricamente disponibilizará dos ingredientes de origem vegetal. Boling et al (2000) Tabela 4 -Consumo, excreção e retenção aparente de fósforo e nitrogênio em poedeiras comerciais alimentadas no período de 64 a 80 semanas de idade com rações contendo sorgo em substituição ao milho e dois níveis de fitase proporcionar diminuição de 20 a 30% na excreção do fósforo e redução significativa nos custos com alimentação. O consumo, a excreção e a retenção de nitrogênio não foram influenciados pelos níveis de fitase (P>0,05), o que contraria os relatos de Nahashon et al (1994) de que a adição de fitase em dietas com 0,25% de Pd para poedeiras promove aumento de 25% na retenção de nitrogênio em relação ao grupo testemunha, evidenciando a eficácia de fitase em hidrolisar a ligação entre o fitato e a proteína, disponibilizando esse nutriente para as aves.…”

Section: Resultsunclassified

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Avaliação da matriz nutricional da enzima fitase em rações contendo sorgo para poedeiras comerciais

et al. 2009

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RESUMO -Avaliaram-se os efeitos da inclusão de fitase e de sua matriz nutricional em rações contendo sorgo sobre o desempenho das aves, a qualidade dos ovos, a ingestão e a excreção e retenção de fósforo e nitrogênio em poedeiras comerciais.Utilizaram-se 180 poedeiras comerciais, distribuídas em delineamento inteiramente ao acaso em esquema fatorial 2 × 2 + 1, com dois níveis de fitase (0 e 500 FTU/kg de ração) e dois níveis de substituição do milho pelo sorgo (50 e 100%) e uma ração testemunha (isenta de sorgo e fitase), constituindo cinco tratamentos com seis repetições de seis aves. As rações foram à base de milho e farelo de soja, sem fitase e sorgo, considerando a matriz nutricional da fitase. O desempenho e a qualidade dos ovos foram avaliados em quatro períodos de 28 dias. Ao final do experimento, um ensaio de metabolismo foi realizado para quantificar a ingestão, excreção e retenção aparente de fósforo e nitrogênio e avaliar a viabilidade econômica das rações. Ao considerar a matriz nutricional da fitase, as exigências em energia, cálcio, fósforo, proteína e aminoácidos foram atendidas, mesmo com a redução dos níveis nutricionais da dieta, e o desempenho e a qualidade dos ovos não foram comprometidos. A adição de fitase nas rações possibilitou reduzir todos os parâmetros econômicos avaliados. O sorgo pode substituir totalmente o milho e ser o único grão energético da dieta.Palavras-chave: alimentos alternativos, avaliação econômica, aves, retenção aparente de fósforo e nitrogênio Evaluation of the nutritional matrix values for phytase enzyme in laying hens diets with sorghum ABSTRACT -The effects were assessed of including phytase and its nutritional matrix in diets containing sorghum on the performance of the birds, egg quality, intake and phosphorus excretion and retention in laying hens. One hundred and eighty laying hens were arranged in a randomized complete design in a 2 × 2 + 1 factorial arrangement with two phytase levels (0 and 500 FTU/kg diet), two levels of corn replacement for sorghum (50 and 100%) and a control diet (without phytase and sorghum) forming five treatments and six replications of six birds. The diets were based on corn and soybean meal, without phytase and sorghum, considering the phytase nutritional matrix. Performance and egg quality were determined in four 28-day periods. At the end of the experiment, a metabolism trial was carried out to quantify intake, excretion and apparent retention of phosphorus and nitrogen and to assess the economic viability of the diets. When the phytase nutritional matrix was considered, the energy, calcium phosphorus, protein and amino acid requirements were met, even with a reduction in the nutritional levels of the diet, and performance and egg quality were not affected. Adding phytase to the diets decreased all the economic parameters. Sorghum can be used to totally replace corn, and can be the only energy grain in the diet.Key Words: alternative foods, apparent phosphorus and nitrogen retention, birds, economic assessment IntroduçãoAtualmente ...

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Section: Resultsunclassified

Avaliação da matriz nutricional da enzima fitase em rações contendo sorgo para poedeiras comerciais

et al. 2009

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“…Garlich et al (1975) found that body weight gain in hens was significantly reduced by a phosphorus-deficient diet (3.9 g of total P/kg) fed for 21 days. Boling et al (2000) showed that a 1.0 g of AP/kg diet resulted in significantly lower (P < 0.05) body weights. In addition, live weight of hens fed the 2.0, 2.5, and 4.5 g of AP/kg diets did not significantly differ throughout the experiment from the 21 st to the 70 th week of hens' age (Boling et al, 2000).…”

Section: Discussionmentioning

confidence: 97%

“…Boling et al (2000) showed that a 1.0 g of AP/kg diet resulted in significantly lower (P < 0.05) body weights. In addition, live weight of hens fed the 2.0, 2.5, and 4.5 g of AP/kg diets did not significantly differ throughout the experiment from the 21 st to the 70 th week of hens' age (Boling et al, 2000). On the other hand, Mikaelian and Sell (1981) and Liebert et al (2005) did not observe an effect of P on body weight.…”

Section: Discussionmentioning

confidence: 97%

The effect of non-phytate phosphorus and phytase levels on performance, egg and tibia quality, and pH of the digestive tract in hens fed higher-calcium-content diet

Englmaierová¹,

Skřivanová²,

Skřivan³

2014

CZECH J ANIM SCI

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THe effect of three levels of non-phytate phosphorus (NPP) (3.0, 2.1, and 1.7 g/kg) and two levels of 3-phytase (F) (0 and 150 phytase units (FTU)/kg) together with a high dietary calcium concentration (approximately 41.0 g/kg) on the performance characteristics, egg quality, pH of the digestive tract, and tibia bone quality of ISA Brown hens housed in enriched cages was evaluated. THe diets with 3.0 g/kg of NPP with and without F and 2.1 g/kg of NPP with 150 FTU of F significantly increased egg production (P = 0.022) and daily egg mass production (P = 0.030). A low level of NPP decreased (P < 0.001) the body weight of hens at the end of the experiment. THe highest values of albumen height (P < 0.001), albumen index (P = 0.004), Haugh units (P = 0.001), and albumen percentage (P = 0.004) were associated with the diet with the low level of dietary NPP without F addition. THe low level of NPP with 3-phytase increased the calcium and phosphorus contents in eggshells (P = 0.002 and P = 0.050). THe lowest values of dry matter (P < 0.001) and ash content in tibia bone (P = 0.040) were measured for the hens fed the diet with 3.0 g/kg of NPP and 3-phytase supplementation. In addition, the low level of phosphorus without F addition increased (P = 0.031) the pH value in the small intestine to 6.21. In conclusion, 2.1 g of NPP with 150 FTU was found to be sufficient in the diet of hens in the middle of the laying cycle housed in enriched cages. But with respect to egg quality, higher calcium content decreased positive effect of F addition in diets with different levels of phosphorus.

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“…Moreover, our results indicate that the lower level of AP (1.3 g/kg) significantly (P < 0.001) decreased the egg weight in comparison to 4.0 g of AP per kg of diet. Some authors have reported that a low dietary AP without supplemental F decreased performance characteristics, such as egg production, feed consumption or egg weight (Summers, 1995;Gordon and Roland, 1998;Boling et al, 2000;Francesch et al, 2005). In contrast, an increase in egg production, feed consumption, and egg weight (Um and Paik, 1999;Cabuk et al, 2004) and an improvement in the feed conversion (Jalal and Scheideler, 2001;Liebert et al, 2005) were found after F addition.…”

Section: Discussionmentioning

confidence: 99%

Efficacy of contrast levels of non-phytate phosphorus and Aspergillus niger phytase in hens fed wheat-maize-based diets

Englmaierová¹,

Dlouhá²,

Marounek³

et al. 2012

CZECH J ANIM SCI

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A 2 × 2 factorial design experiment examined the effect of dietary non-phytate phosphorus (NPP) (1.3 and 4.0 g/kg) and 3-phytase (F) (0 and 150 FTU/kg) on the performance indicators of hens, physical parameters of eggs, phosphorus (P) content of the eggshells, and the pH of the digestive tract of laying hens. Two hundred and forty hens (ISA Brown) were housed in enriched cages and fed a wheat-maize-based diet. A significant effect of both NPP and F was found for the yolk colour (P = 0.016) and shell thickness (P = 0.038). The F supplement or higher level of NPP alone and in combination increased the value of the yolk colour and shell thickness. The supplementation of the basal diet with F significantly increased the laying performance, especially with regard to the egg weight and feed conversion ratio. The higher dose of NPP had a negative effect on the egg production, feed intake, and feed conversion ratio. The lower level of NPP (1.3 g/kg) decreased the internal egg quality and shell quality, except for the shell strength. In contrast, the addition of 3-phytase to the diet increased the shell thickness and shell weight. The P content in the eggshells was not influenced by the dietary treatment. The higher level of NPP or F increased the pH in the gizzard to a value suitable for F activity. The hens fed a diet containing 1.3 g/kg NPP achieved a higher performance; moreover, the F supplement at 150 FTU/kg increased the external quality of the eggs.Keywords: laying hen; egg production; feed intake; eggshell quality; pH Mineral phosphorus (P) is important for proper bone development, formation of eggshells, and metabolism of laying hens. Approximately 20-50% of plant P is available in a poultry diet, and the rest is present in the form of phytate. Phytate P is biologically less available to poultry due to either insufficient quantity or the lack of secretion of phytase (F), which hydrolyses phytic acid in the digestive tract (Ravindran et al., 1995;Sebastian et al., 1998).As shown by the results of Swiatkiewicz et al. (2010), reducing the dietary levels of Ca (from 3.70 to 3.25%) and P (from 0.65 to 0.60%) significantly decreased the percentage of the eggshell, thickness, density, and breaking strength of the eggshell. However, de Faria et al. (1999) observed decreases in the egg production, egg weight, and egg mass without alterations in the eggshell quality characteristics in hens fed diets containing 0.35% of total P as opposed to 0.55% of total P. Sohail et al. (2001) observed a reduction of egg production (by 8.5 and 6.8%) and feed consumption due to decreases in the non-phytate phosphorus (NPP) from 0.40 and 0.25% to 0.09%. Based on the findings of Skřivan et al. (2010), 0.27% of available phosphorus (AP) in a wheat-based diet and 0.30% of the AP in a maizebased diet are adequate for hens having an intake of 115 g of feed containing 3.5% Ca without a negative impact on the performance or egg quality. According to a study by Rodrigues et al. (1998), levels of 0.35 and 0.25% of AP for the initial an...

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The effects of various dietary levels of phytase and available phosphorus on performance of laying hens

Cited by 61 publications

References 5 publications

Avaliação da matriz nutricional da enzima fitase em rações contendo sorgo para poedeiras comerciais

Avaliação da matriz nutricional da enzima fitase em rações contendo sorgo para poedeiras comerciais

The effect of non-phytate phosphorus and phytase levels on performance, egg and tibia quality, and pH of the digestive tract in hens fed higher-calcium-content diet

Efficacy of contrast levels of non-phytate phosphorus and Aspergillus niger phytase in hens fed wheat-maize-based diets

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