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Graded levels of phytase past industry standards improves broiler performance.
The overall performance of 0-to-16-d-old, mixed-sex, Cobb x Cobb broiler chicks when dietary phytase levels were supplemented in excess of industry standards indicates that broilers consuming a tP-deficient corn-soybean meal diet can achieve maximum performance and that currentphytase supplementation levels within the poultry industry may need to be reevaluated.
Effects of calcium and nonphytate phosphorus concentrations on phytase efficacy in broiler chicks.
Comparison of surfaces showed that growth and bone quality responses to phytase were greatest at low NPP levels and high Ca levels, and these decreased when the Ca level was reduced or when the NPP level was increased.
Calcium requirements of the modern broiler chicken as influenced by dietary protein and age.
The results suggest that the current NRC Ca requirements for the broiler starter (1.0%) are sufficient for maximum bone ash, but thatCa requirements for grower birds (0.9%) may be excessive for optimum BWG, FCR, and tibia ash.
Quantitative evaluation of 1-alpha-hydroxycholecalciferol as a cholecalciferol substitute for broilers.
Considering all the data from both experiments, the 1alpha-OHD3 appears to be approximately eight times as effective as D3 for satisfying the requirements of several criteria in two experiments with broiler chickens.
The effects of 1,25-dihydroxycholecalciferol and phytase on the natural phytate phosphorus utilization by laying hens.
Results clearly indicate that phytase, and to a lesser extent 1,25-(OH)2D3, can be used to increase the utilization of phytate P by laying hens.
Maintenance lysine requirement and efficiency of using lysine for accretion of whole-body lysine and protein in young chicks.
The data demonstrated that at nitrogen equilibrium, chicks are in negative Lys balance but are in positive balance of glycine and proline.
Power of two methods for the estimation of bone ash of broilers.
- L. Hall, R. Shirley, R. Bakalli, S. Aggrey, G. Pesti, H. M. Edwards
- Mathematics, MedicinePoultry science
- 1 March 2003
The autoclaving method is less labor-intensive and requires no toxic solvents, but for older birds, many more samples or replications are needed to detect the same treatment differences, so the boiling/extracting method is preferred.
Maintenance threonine requirement and efficiency of its use for accretion of whole-body threonine and protein in young chicks.
- H. M. Edwards, D. Baker, S. Fernandez, C. Parsons
- Biology, MedicineThe British journal of nutrition
- 1 July 1997
The data suggest that efficiency of Thr utilization is constant at all levels of Thr intake between 5 and 95% of the level required for maximal weight gain and feed efficiency.
Twenty-five hydroxycholecalciferol as a cholecalciferol substitute in broiler breeder hen diets and its effect on the performance and general health of the progeny.
When comparing vitamin D sources, 25-OHD3 had greater potency than D3 only at very low levels of supplementation, and in relation to vitamin D3 depended on the level tested.
Maintenance requirement for valine and efficiency of its use above maintenance for accretion of whole body valine and protein in young chicks.
- D. Baker, S. Fernandez, C. Parsons, H. M. Edwards, J. Emmert, D. Webel
- Chemistry, MedicineThe Journal of nutrition
- 1 July 1996
The results of these studies suggest a constant utilization above maintenance of absorbed valine over a wide range of valine intake in chicks during the period 10-20 d posthatching.