Effect of Calcium and Phosphorus Levels on the Performance of Layers in Nigeria

Kalango, Irene O.; Ademosun, A. A.

doi:10.3382/ps.0521393

Cited by 9 publications

(5 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the absolute retention of calcium was increased and the absolute retention of phosphorus was decreased with increasing dietary levels of calcium. The decreasing percent retention of calcium in response to increasing dietary levels of calcium is consistent with findings of Hurwitz and Griminger (1960), Kalango and Ademosun (1973), and Atteh and Leeson (1983); the increase in absolute retention of calcium with increasing levels of calcium is in agreement with findings of Ademosun and Nikolaiczuk (1966) and Kalango and Ademosun (1973). The reduction in phosphorus retention with increasing dietary levels of calcium is consistent with the findings of Tyler (1946) and Salem and Reda (1955); however, it is not consistent with the report of Kalango and Ademosun (1973).…”

Section: Resultssupporting

confidence: 90%

The Effect of Dietary Levels of Calcium and Phosphorus on Performance and Retention of These Nutrients by Laying Hens

Keshavarz

1986

Poultry Science

View full text Add to dashboard Cite

The first experiment utilized three levels of calcium (3.5, 4.5, and 5.5%) and three levels of available phosphorus (.24, .44, and .64%). The birds were 56 weeks old at the beginning of the experiment and were fed the experimental diets for 16 weeks. Egg production, egg weight, feed consumption, plasma calcium and phosphorus, egg shell quality, and tibia ash were not significantly affected by different dietary levels of calcium. Dietary levels of phosphorus did not have a significant effect on the aforementioned parameters, except that feed consumption and plasma level of phosphorus were significantly lower with the lowest level of dietary phosphorus. The absolute retention of calcium was increased but that of phosphorus decreased with increasing levels of calcium. Dietary levels of phosphorus did not significantly affect the absolute retention of calcium or phosphorus.The second experiment used four levels of calcium (3.5, 4.5, 5.5, and 6.5%). The birds were 42 weeks old at the beginning of the experiment and were fed the experimental diets for 20 weeks. Production parameters were not significantly affected by different dietary levels of calcium.The third experiment used three levels of calcium (3.5, 5.0, and 6.5%). Birds were 80 weeks old at the beginning of the experiment and were fed the experimental diets for 16 weeks. Egg production and egg weight were significantly lower with 6.5% than with lower levels of calcium.These experiments suggest that high dietary levels of calcium may affect the performance of old hens. Short duration of high calcium feeding does not seem to affect significantly the performance of younger hens. Absence of a significant interaction between calcium and phosphorus on production parameters indicates that calcium-phosphorus ratio is not as crucial in the laying hens as in the growing chicks. (

show abstract

Section: Resultssupporting

confidence: 90%

The Effect of Dietary Levels of Calcium and Phosphorus on Performance and Retention of These Nutrients by Laying Hens

Keshavarz

1986

Poultry Science

View full text Add to dashboard Cite

show abstract

“…The nature of these interactions is not clear. The ndings seems to agree with those of Kalango and Ademosun (1973) and Mathur et al (1982). In a tropical climate, where the animals are frequently under heat stress, parathyroid hormone output which mobilises Ca from bones, is depressed.…”

Section: Resultssupporting

confidence: 91%

“…It is worth noting that absolute retention did not improve signi cantly (P , 0·05) beyond 36·0 g Ca/ kg. Kalango and Ademosun (1973) and Mathur et al (1982) showed a similar trend of Ca retention in layers.…”

Section: Resultsmentioning

confidence: 62%

“…NRC (1994) recommends 32·5 g/kg Ca and 1·5 g/kg nonphytate P and warns that the requirement of nonphytin P may be greater at very high temperatures. BIS (1992) recommends 30 g/kg Ca and 5 g/kg available P but there are few and con icting reports from tropical countries (Reddy et al 1968;Kalango and Ademosun, 1973;Ameenuddin et al, 1976;Mathur et al, 1979Mathur et al, , 1982.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of dietary calcium and phosphorus concentrations on retention of these nutrients by caged layers

Jadhao¹,

Sinha²

1998

British Poultry Science

View full text Add to dashboard Cite

1. A 5 x 3 factorial experiment was carried out with caged White Leghorn hens with 5 concentrations of calcium (26.0, 29.0, 32.5, 36.0, 39.0 g/kg) and 3 concentrations of phosphorus (4.3, 5.0 and 6.0 g/kg) for 120 d. Variables observed were hen day egg production, food consumption, shell weight, shell weight per unit surface area (SWUSA) and egg content. 2. 36.0 g calcium (Ca) and 4.3 g phosphorus (P) kg were found to be the dietary concentrations that resulted in optimal hen day egg production, shell weight, SWUSA and egg content. 3. Lack of a significant interaction between the effects of calcium and phosphorus on production parameters showed that the dietary Ca:P ratio is not of great importance for the laying hen. 4. Absolute retentions of Ca and P were inversely related to percentage retentions. 5. A balance study of calcium and phosphorus also showed optima at 36.0 g Ca and 4.3 g P per kg. 6. It was inferred that 36.0 g Ca and 5.0 g total P per kg are the optimal concentrations in diets for caged layers in a tropical climate.

show abstract

“…It has been reported that increasing dietary phosphorus above the level required for maximum egg production did not influence bone breaking strength (Singh et al, 1971;Kalango and Ademosun, 1973). A trend was found in the present experiment indicating breaking strength of tibias from hens fed .4% TP (a level which supported satisfactory egg production) was lower than breaking strength of tibias from hens fed higher phosphorus levels (Table 5).…”

Section: Tibia Breaking Strength and Femur Ashsupporting

confidence: 48%

A Comparison of Continuous and Phased Levels of Dietary Phosphorus for Commercial Laying Hens

Said

Sullivan

1985

Poultry Science

View full text Add to dashboard Cite

One hundred and forty hens of a commercial strain were allocated randomly to 7 treatment groups of 20 birds each at 20 weeks of age. Five treatment groups were assigned to ground yellow corn-soybean meal diets containing either .40, .45, .50, .55, or .60% total phosphorus (TP) with supplemental phosphorus (P) from dicalcium phosphate (DCP). Two remaining groups were phase fed decremental TP levels of either . 60, .55, .50, and .45%, or .55, .50, .45, and .40% for intervals of 21 to 32, 3 3 to 44, 45 to 56, and 57 to 68 weeks of age, respectively. The experiment was 48 weeks in duration.The 5 continuous phosphorus levels had nearly the same effect on cumulative egg production, egg weight, specific gravity of eggs, feed consumption, and feed conversion ratio. A significant linear effect of phosphorus level on specific gravity of eggs was observed at 56 weeks (P-C01) and 68 (P-C05) weeks of age, with specific gravity being decreased as phosphorus level increased. Bone ash values at 68 weeks of age were higher among hens receiving .45, .50, and .55% TP and lower among hens fed .40 and .60% TP (linear, cubic, and quadratic effects, P<.005).Phased TP regimens significantly: improved egg specific gravity (P<.005) at 44, 56, and 68 weeks of age; increased percent bone ash at 68 weeks of age (P<.05); increased feed consumption (P<.05); and decreased feed efficiency (P<.05) in relation to continuous TP levels.Results of this study suggested the feeding of at least .45% TP continuously from 21 to 68 weeks of age for optimum performance by this strain, Hy-Line W-36. Calculations of average daily TP consumption rates indicated that caged layers of this strain should ingest 600 and 540 mg of TP for intervals of 21 to 44 and 45 to 68 weeks of age, respectively, for optimum performance. (

show abstract

Effect of Calcium and Phosphorus Levels on the Performance of Layers in Nigeria

Cited by 9 publications

References 12 publications

The Effect of Dietary Levels of Calcium and Phosphorus on Performance and Retention of These Nutrients by Laying Hens

The Effect of Dietary Levels of Calcium and Phosphorus on Performance and Retention of These Nutrients by Laying Hens

Effect of dietary calcium and phosphorus concentrations on retention of these nutrients by caged layers

A Comparison of Continuous and Phased Levels of Dietary Phosphorus for Commercial Laying Hens

Contact Info

Product

Resources

About