A comparison between cholecalciferol and 25-OH-cholecalciferol on performance and eggshell quality of hens fed different levels of calcium and phosphorus

Keshavarz, K.

doi:10.1093/ps/82.9.1415

Cited by 55 publications

(37 citation statements)

References 20 publications

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“…Specific gravity is a measurement, which has the advantage of not destroying the eggs when measuring eggshell quality; however, it is not very accurate when minimal differences are expected. Previous results evaluating supplementation of 25 (OH) D 3 have also demonstrated a limitation in obtaining advantage when eggshell quality was assessed using specific gravity (Roland & Harms, 1976;Keshavarz, 1996;Keshavarz, 2003).…”

Section: Resultsmentioning

confidence: 99%

Productive performance of broiler breeder hens fed 25-hydroxycholecalciferol

et al. 2009

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Section: Resultsmentioning

confidence: 99%

Productive performance of broiler breeder hens fed 25-hydroxycholecalciferol

et al. 2009

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“…The opposite results were reported by Carlos and Edwards (1998) and Berry et al (2003) who did not find any significant effect of F on the egg weight. Accordingly, Keshavarz (2003) showed that the presence of F did not have an effect on performance but reduced several indices of shell quality. In addition, Lim et al (2003) recorded a significant interaction between the NPP level and F for egg production.…”

Section: Discussionmentioning

confidence: 97%

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 negative effect of F observed in the present study could be due to the greater Ca : P ratios (from 7.5 : 1 to 10.5 : 1) in all of the evaluated diets, and F supplementation may have exacerbated this effect by releasing Ca from the phytate complex. Keshavarz (2003) showed that the presence of F reduced several indices of shell quality. On the other hand, 150 FTU of 3-phytase improved the pigmentation of the egg yolk.…”

Section: Discussionmentioning

confidence: 99%

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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A comparison between cholecalciferol and 25-OH-cholecalciferol on performance and eggshell quality of hens fed different levels of calcium and phosphorus

Cited by 55 publications

References 20 publications

Productive performance of broiler breeder hens fed 25-hydroxycholecalciferol

Productive performance of broiler breeder hens fed 25-hydroxycholecalciferol

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

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

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