Calcium tolerance of growing chickens: effect of ratio of dietary calcium to available phosphorus

Shafey, T. M.

doi:10.1079/wps19930002

Cited by 47 publications

(30 citation statements)

References 65 publications

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“…Significantly (P<0.01) the highest cumulative body weight of broilers was recorded with the basal diet containing 4% soybean oil. Female broilers fed with rations containing different sources of lipids (beef tallow, soybean oil, canola oil, marine fish oil or a mixture of these oils) and observed that live weight was significantly higher when soybean oil was used, that was similar to the experimental results (Shafey, 1993). …”

Section: Body Weightsupporting

confidence: 78%

Performance of Broilers Fed Diets Supplemented With Graded Levels of Soybean Oil and Different Sources of Bone Meal

Tiwari¹,

Sapkota

Nepali

et al. 2016

Int J Appl Sci Biotechnol

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An experiment was conducted to investigate the effects of inclusion of three levels of soybean oil (0%, 2% and 4%) and three sources of commercial bone meals (GBM, PBM and IBM) in the diet of broiler chicken. Body weight, weight gain, feed consumption, feed efficiency, digestibility coefficient, calcium, phosphorus and ash content of blood and bone of broilers were measured. Significantly higher (P<0.01) average weekly feed consumption, average cumulative body weight, average weekly body weight gain was found in broilers fed diets containing soybean oil. The highest (5058.27 g) average total feed consumption was recorded on T9 and the lowest (4117.88 g) on T1. The highest average cumulative body weight was obtained on T6 (2168.33 g) and was the lowest on T1 (1930.00 g). Similarly, the highest average body weight gain was recorded on T6 (301.04 g) and the lowest on T1 (273.77 g). The abdominal fat weight percentage was maximum (2.38%) on the diet containing 4% soybean oil with GBM and minimum (1.04%) on the diet without soybean oil with IBM. However, the overall performance of broilers was found improved on the diet containing soybean oil. The ash, calcium and phosphorus content of blood and bone were better when supplied the diet with 2% to 4% soybean oil containing the sources of bone meal. Considering better bone calcification, phosphorus and minerals utilization in the chicken body, 2% to 4% levels of the soybean oil with the GBM source of bone meal could be incorporated in the diets.

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Section: Body Weightsupporting

confidence: 78%

Performance of Broilers Fed Diets Supplemented With Graded Levels of Soybean Oil and Different Sources of Bone Meal

Tiwari¹,

Sapkota

Nepali

et al. 2016

Int J Appl Sci Biotechnol

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“…Birds fed low Ca diets appeared to be eating to a Ca intake target, and were willing to over consume nPP to try and reach this target, and were seen to have higher feed intake. Shafey (1993) found when dietary nPP intake increases (such as may be associated with birds attempting to achieve a Ca intake target) the availability of Ca in the intestinal lumen decreases, stimulating hormonal secretion of parathyroid hormone which increases bone resorption, consequently reducing bone ash. However, the results of the present study did not suggest that birds eat to achieve an nPP intake target.…”

Section: Discussionmentioning

confidence: 99%

Nutritional geometry of calcium and phosphorus nutrition in broiler chicks. Growth performance, skeletal health and intake arrays

Bradbury

Wilkinson

Cronin

et al. 2014

animal

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The interaction between calcium (Ca) and non-phytate phosphorus (nPP) in broiler nutrition and skeletal health is highly complex with many factors influencing their digestion, absorption and utilisation. The use of an investigative model such as the geometric framework allows a graphical approach to explore these complex interactions. A total of 600 Ross 308-day-old male broiler chicks were allocated to one of 15 dietary treatments with five replicates and eight birds per replicate. Dietary treatments were formulated to one of three total densities of total Ca + nPP; high (15 g/kg), medium (13.5 g/kg) and low (12 g/kg) and at each density there were five different ratios of Ca : nPP (4, 2.75, 2.1, 1.5 and 1.14 : 1). Weekly performance data was collected and at the end of the experiment birds were individually weighed and the right leg removed for tibia ash analysis. Skeletal health was assessed using the latency to lie (LTL) at day 27. At low Ca and high nPP as well as high Ca and low nPP diets, birds had reduced feed intake, BW gain, poorer feed efficiency and lower tibia ash, resulting in a significant interaction between dietary Ca and nPP (P < 0.05). LTL times were negatively influenced by diets having either a broad ratio (high Ca, low nPP) or too narrow a ratio (low Ca, high nPP) indicating that shorter LTL times may be influenced by the ratio of Ca : nPP rather than absolute concentrations of either mineral. The calculated intake arrays show that broilers more closely regulate Ca intake than nPP intake. Broilers are willing to over consume nPP to defend a Ca intake target more so than they are willing to over consume Ca to defend an nPP target. Overall dietary nPP was more influential on performance metrics, however, from the data it may appear that birds prioritise Ca intake over nPP and broadly ate to meet this requirement. As broilers are more willing to eat to a Ca intake target rather than an nPP intake target, this emphasises the importance of formulating diets to a accurately balanced density of Ca : nPP considering the biological importance of both minerals.

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“…Decreasing in solubility of minerals complexes as a result of increased ileal pH by the relatively high concentration of calcium was mentioned by Shafey (1993). Sheikhlar et al (2009) showed that wide Ca : P ratio increased (P < 0.05) the retention of P. In addition, Ca and P of tibia linearly decreased as dietary NPP levels were reduced (Lim et al, 2001).…”

mentioning

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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Calcium tolerance of growing chickens: effect of ratio of dietary calcium to available phosphorus

Cited by 47 publications

References 65 publications

Performance of Broilers Fed Diets Supplemented With Graded Levels of Soybean Oil and Different Sources of Bone Meal

Performance of Broilers Fed Diets Supplemented With Graded Levels of Soybean Oil and Different Sources of Bone Meal

Nutritional geometry of calcium and phosphorus nutrition in broiler chicks. Growth performance, skeletal health and intake arrays

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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