The Effects of Microbial Phytase and Dietary Calcium Level on the Performance and Eggshell Quality in Laying Hens Fed Marginal Phosphorus Diets

AL-Massad, Motasem; Al-Shdefat, Ramadan; Khashroum, Ashraf

doi:10.3923/ajas.2011.118.126

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…In the presence of 150, 300, and 400 phytase units (FTU)/kg of feed, the dietary NPP level may be decreased, and optimal levels were calculated as being 1.8, 1.5, and 1.4 g/kg, respectively. In addition, Al-Massad et al (2011) found that 1.2 g/kg NPP appears to be sufficient for maintaining production performance and eggshell quality in hens fed a corn-soybean meal diet containing 34 g/kg Ca and supplemented with F. On the other hand, Castillo et al (2004) showed that the biological optimum levels of Ca for maximum egg production and specific gravity were 43.4 and 46.0 g/kg, respectively, and the economic optimum level for maximizing profits was 43.8 g/kg in diets containing 4.0 g/kg AP.…”

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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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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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“…In addition to the nutrients already available in the egg if we can alter or incorporate certain health beneficiary nutrients then these eggs will be the choice of food for health conscious people and can reduce the chances of occurrence of certain diseases. Enriched egg with trace minerals results in eggs with superior biological and nutritional value for human consumption [ 1 ]. Surveys carried out by Indian Council of Medical Research have shown that no state or union territory is free from the problem of iodine deficiency disorders (IDDs).…”

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Effect of dietary iodine on production of iodine enriched eggs

Sumaiya¹,

Nayak²,

Baghel³

et al. 2016

Vet World

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Aim:Objective of this study was to investigate the effect of different levels of iodine supplementation on iodine content of eggs in laying hens.Materials and Methods:In the experiment, 135 laying hens (White Leghorn) of 55 weeks age were randomly distributed to 5 dietary treatments; each group contained 27 laying hens distributed in three replicates of 9 birds each. Diet T1 was control basal layer diet without iodine enrichment in which iodine content (I2) was as per NRC recommendation. Basal diets were supplemented with calcium iodate (Ca (IO3)2) at 5, 10, 15 and 20 mg/kg in T2, T3, T4 and T5 groups, respectively. The iodine content in the calcium iodate is 65.21%, therefore, the diets T2, T3, T4 and T5 contained 3.25, 6.50, 9.75 and 13.0 ppm iodine, respectively. The laying hens were fed the respective experimental diets ad libitum during the experimental period of 10-week. The iodine content of egg yolk and albumen was analyzed at the end of 5th and 10th week of the experiment. Economics of feeding for the production of iodine enriched egg was calculated at the end of the experiment.Results:Increasing iodine levels in diet of hens from 0.45 to 13.0 ppm significantly increased egg iodine concentration, the highest concentration of egg iodine was observed in the group fed diet supplemented with 13.0 ppm iodine followed by those fed 9.75, 6.50, 3.25 and 0.45 ppm iodine in diet. There was no significant difference in the iodine levels of unboiled versus boiled eggs. Therefore, the consumers are ensured to receive the optimal levels of iodine from boiled iodine-enriched eggs. Among different diets, minimum and significantly lower feeding cost (Rs. per dozen or per kg eggs) was noticed in hens allotted T3 diet (6.50 ppm I2). However, feeding cost of hens receiving 3.25 and 9.25 ppm I2 was statistically (p<0.05) similar to control group (T1). Further, it was noticed that feeding cost (Rs. per dozen or per kg eggs) was significantly increased due to the inclusion of higher level of iodine (13.0 ppm).Conclusion:It was concluded that supplementing iodine at 6.50 ppm in layers diet was economically better for the production of iodine enriched eggs followed by feed iodine supplementation at 3.25 ppm as compared to control and other treatment groups.

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Egg quality and production performance of laying hens injected with growth hormone and testosterone in the late phase of production

et al. 2016

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In this study, 160 73-week-old laying hens (HyLine W-36) were used to investigate the changes in production performance and egg quality parameters of aged laying hens after injection of different doses of growth hormone (GH) and a fixed dose of testosterone (Ts). The hens were weighed individually, placed in laying cages and then randomly assigned to four treatments with four replicates of 10 birds each, in a completely randomised design. The experiment was started at the 75th week and lasted until the 82nd week of age. The treatments were: 1: injection of 100 µL distilled water (control group), 2: injection of 500 µg Ts/kg liveweight + 50 µg GH/kg liveweight, 3: injection of 500 µg Ts/kg liveweight + 100 µg GH/kg liveweight and 4: injection of 500 µg Ts/kg liveweight + 150 µg GH/kg liveweight. In this study, ovulation rate (egg production percent), egg mass and feed intake were significantly higher in Treatment 3 than the control group (P < 0.05), and in Treatment 4, feed conversion ratio was significantly higher than for the other experimental groups (P < 0.05). In addition, the birds in Treatment 3 showed greater egg weight, albumen height, eggshell weight, eggshell density and eggshell weight per surface area than the control group (P < 0.05). In Treatment 3, egg length significantly increased compared with Treatments 1 and 4 (P < 0.05), and in Treatments 2 and 4, shell breaking strength was significantly lower than for the control group (P < 0.05). In conclusion, our results showed positive effects of GH and Ts administration on egg quality parameters and production performance in aged laying hens. Taken together, in the present study Treatment 3 was found more effective in improving egg quality and production performance of the old laying hens.

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The Effects of Microbial Phytase and Dietary Calcium Level on the Performance and Eggshell Quality in Laying Hens Fed Marginal Phosphorus Diets

Cited by 4 publications

References 5 publications

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

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

Effect of dietary iodine on production of iodine enriched eggs

Egg quality and production performance of laying hens injected with growth hormone and testosterone in the late phase of production

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