|
|
Influence of dietary phytase on broilers performance fed low- phosphorus corn/soybean or sunflower diets based on digestable or deficient amino acids
|
|
Abstract: Two experiments were conducted to investigate the influence of using microbial phytase with 1ow-nP P diets on broiler performance Experiment I, was conducted to investigate the using of two dietary protein sources soybean meal (SBM) and sunflower meal (SFM), two levels of microbial phytase (0 and 750 FTU/kg). A positive control diet (adequate in non-phytate phosphorus (nPP) 0.45/0.35% (at starter and grower period) and Ca level 1%)) and based on total (TAA) and digestible (DAA) amino acids; methionine (Met) and lysine (Lys). A total number of 360 unsexed one-day old, Arbor Acres broiler chicks were randomly and equally distributed into 12 treatments of 30 chicks each, in three replicates (10 chicks, each).
The experiment II, Two hundred and forty-unsexed, one-day old Arbor Acres broiler chicks were distributed into 8 treatments of 30 chicks each, in three replicates (10 chicks, each). A 2 x 2 x 2 factorial arrangement of treatments was used with two dietary protein sources (SBM and SFM), two levels of microbial phytase (0 and 750 FTU/kg) and adequate (NRC, 1994) or deficient amino acids levels (Met and Lys). The level of Ca in 10w-nPP diets plus phytase (750 FTU/kg diet) was 0.6%.
Results obtained are as follows:
Exp. I: The low-nPP without phytase supplementation diets caused a negative effect on growth performance (P<0.01), plasma P level, tibia weight and mineral retention compared to those fed the control diet or low- nPP diets plus phytase. Phytase supplementation to low- nPP diets improved broilers performance, nutrients digestibility coefficients, economic efficiency and increased plasma P level (P<0.01), tibia weight and mineral retention, and decreased plasma (P<0.01) Ca, Zn, and Mg levels compared to those fed low- nPP diets without phytase.
Chicks either fed diets based on DAA or corn/ sunflower meal recorded (P<0.0l) the best growth performance and higher (P<0.0l) plasma P, Ca and Mg levels compared to those fed TAA or corn /soybean meal.
Exp. II: Chicks fed diets deficient in AA recorded the lowest growth performance. Phytase supplementation to low-nPP diets improved broiler performance, minerals retention, economic efficiency and digestion coefficient of CP and NB. Phytase supplementation of low-nPP diets supplemented with AA (Met and Lys) recorded a comparable growth performance with chicks fed control diet. Chicks either fed diets based on adequate in AA or corn/soybean meal increased (P<0.0l) BWG, breast meat and Mg concentrations and improved FC and economic efficiency and decreased abdominal fat percentage compared to those fed diets deficient in AA or corn/sunflower meal diets.
|
| Publication year |
2006
|
| Pages |
427-454
|
| Availability location |
معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى- الجيزة
|
| Availability number |
|
| Organization Name |
|
| City |
الاسكندرية
|
| serial title |
Egyptian Poultry Science
|
| ISSN |
1110-5623
|
| Author(s) from ARC |
|
| External authors (outside ARC) |
اسامة الحسينى
جامعة القاهرة
|
| Agris Categories |
Animal feeding
|
AGROVOC
TERMS |
Amino acids.
Broiler chickens.
Performance testing.
Phytase.
Soybean meal.
Sunflower meal.
|
| Proposed Agrovoc |
low phosphorus;microbial phytase;
|
| Publication Type |
Journal
|