The effects of supplementary bacterial phytase on dietary energy and total tract amino acid digestibility when fed to young chickens

Pirgozliev, V.; Bedford, M. R.; Acamovic, T.; Mareš, Petr; Allymehr, Manoochehr

doi:10.1080/00071668.2011.560596

Cited by 37 publications

(21 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This is despite the reduction of 36 % non-phytate P compared with that recommended by the National Research Council ( 14 ) . It is noteworthy that the continuing positive response of bird growth performance to supra-dosages of exogenous phytase is in agreement with previous research ( 13 , 24 ) , and shows that the recently recommended 500 FTU/kg seems to be much lower than the potential commercial optimum.…”

Section: Discussionsupporting

confidence: 91%

Energy utilisation and growth performance of chicken fed diets containing graded levels of supplementary bacterial phytase

Pirgozliev

Bedford

2012

Br J Nutr

Self Cite

View full text Add to dashboard Cite

A total of 364 female Ross 308 chicks (1 d old) were used in the present study conducted in floor pens to investigate the effects of graded levels of supplementary bacterial phytase on dietary energy utilisation and growth performance. For this purpose, four maize -soyabean-based diets were offered to the birds from 0 to 21 d of age. These included a suboptimal P negative control (NC, 3·0 g/kg non-phytate P), NC þ 250 phytase units (FTU)/kg feed, NC þ 500 FTU and NC þ 2500 FTU. The effect of phytase activity on bird growth performance was best described as a linear relationship between increasing dose and increased feed intake (P,0·001), but was quadratic for body-weight gain (P¼ 0·002) and feed efficiency (P¼ 0·023). There was no significant response (P. 0·05) of dietary apparent metabolisable energy (AME) to supplementary phytase. The birds fed phytase increased their retention of total carcass energy in a linear fashion (P¼ 0·009) with increased phytase dose. The efficiency of dietary AME used for overall carcass energy retention also improved (P¼0·007) in a linear manner with increased dietary phytase activity. Dietary net energy for production (NE p ) increased (P¼ 0·047) with an increase in phytase dose following a linear pattern, as an increase of 100 FTU increased dietary net energy by 15·4 J (estimated within the range of doses used in the present experiment). Dietary NE p was more highly correlated with performance criteria than dietary AME, and it seems to be a more sensitive way to evaluate broiler response to phytase supplementation.Key words: Chickens: Bacterial phytase: Net energy: Energy retention Diet composition is a major variable in poultry production. There is a wide range of feedstuffs available to the feed industry and the decision to use a specific feedstuff is often price dependent. The price of feedstuffs depends, among other factors, on their nutrient composition and the concentration of available energy. The cost of supplying available energy accounts for about half of the cost of a broiler chicken feed (1) .The availability of dietary energy in turn depends on the availability of carbohydrates, protein and starch, all of which may be impaired by anti-nutritive factors. Dietary phytate, a mixture of phytic acid and its salts, has been viewed as an anti-nutrient due to its ability to chelate minerals and react with starch and protein, reducing their availability for poultry (2,3) . Poultry do not produce meaningful quantities of endogenous phytase (4,5) and, as a result, the detrimental effects of phytate in poultry diets can be ameliorated by the addition of microbial phytases.So far, the majority of the studies evaluating the effect of phytase on available energy have been performed using the metabolisable energy system, i.e. dietary apparent metabolisable energy (AME). Although dietary AME is widely used to describe the available energy concentration in poultry feedstuffs, diets with the same AME are not necessarily used with equal efficiency when fed to poultry (6 -9) . ...

show abstract

Section: Discussionsupporting

confidence: 91%

Energy utilisation and growth performance of chicken fed diets containing graded levels of supplementary bacterial phytase

Pirgozliev

Bedford

2012

Br J Nutr

Self Cite

View full text Add to dashboard Cite

show abstract

“…Phytase hydrolyzes the phytate molecule, releasing P and at the same time reducing the concentration and thus the anti-nutritional effects of phytate. Previous trials have shown that birds fed high levels of phytase have better FCR (Pirgozlev et al, 2011) and anti-oxidant status (Karadas et al, 2010), compared with birds fed diets sufficient in available P. In the present experiment, 500 FTU/kg inclusion of phytase in an available P adequate diet and 1,000 and 1,500 FTU/kg inclusion of phytase in a marginally deficient diet improved FCR of birds compared with birds fed a diet meeting the available P and Ca requirement, supporting the concept that hydrolysing phytate and consequently reducing the anti-nutritional effects of phytate can improve bird performance, particularly feed efficiency.…”

Section: Resultsmentioning

confidence: 99%

“…The inclusion of higher levels of phytase in broilers diets has shown to improve broiler performance (Pirgozlev et al, 2011), while also improving the antioxidant status of animals (Karadas et al, 2010), which can be related to a reduction in the anti-nutritive effect of phytate. As a result, the objective of this study was to investigate the anti-nutritional effect of phytate and benefits associated with phytate hydrolysis with the inclusion of high doses of phytase in a diet not severely limited in available P.…”

Section: Introductionmentioning

confidence: 99%

Effect of High Phytase Inclusion Rates on Performance of Broilers Fed Diets Not Severely Limited in Available Phosphorus

Santos

Srinongkote

Bedford

et al. 2013

Asian Australas. J. Anim. Sci

View full text Add to dashboard Cite

Phytate is not only an unavailable source of phosphorus (P) for broilers but it also acts as an anti-nutrient, reducing protein and mineral absorption, increasing endogenous losses and reducing broiler performance. The objective of this study was to investigate the anti-nutritional effects of phytate by including high levels of phytase in diets not severely limited in available P. A total of 768 male Arbor Acres broilers were distributed in six treatments of eight replicate pens of 16 birds each consisting of a positive control diet (PC), positive control with 500 FTU/kg phytase, negative control (NC) diet with lower available P and calcium (Ca) levels and the same NC diet with 500, 1,000 or 1,500 FTU/kg phytase. Body weight gain (BWG), feed intake (FI), feed conversion ratio (FCR) and mortality were determined at 21 and 35 d of age while foot ash was determined in four birds per pen at 21 d of age. FI, FCR and foot ash where not affected by the lower mineral diets at 21 d of age nor by the enzyme inclusion but broilers fed lower Ca and available P diets had lower BWG. At 35 d of age no difference was observed between broilers fed the positive or NC diets but broilers fed 500, 1,000 and 1,500 FTU/kg on top of the NC diet had better FCR than broilers fed the positive control diet. When compared to birds fed a diet adequate in P, birds fed the same diet included with 500, 1,000 and 1,500 FTU/kg of phytase in marginally deficient available P and Ca diets had an improvement of performance. These results support the concept that hydrolysing phytate and reducing the anti-nutritional effects of phytate improves bird performance on marginally deficient diets that were not covering the P requirement of birds.

show abstract

“…The increase in MEI may be the result of higher feed intake, which is correlated with NEp. This is because, with a greater consumption of feed, there is a greater energy intake, which can be used for production rather than maintenance (Pirgozliev et al, 2011). Along with more feed consumption and the highest body weight gain, this group of birds showed increased utilization of different nutrients.…”

Section: Discussionmentioning

confidence: 87%

Increasing zinc levels in phytase-supplemented diets improves the performance and nutrient utilization of broiler chickens

Akter¹,

Iji²,

Graham³

2017

SA J. An. Sci.

View full text Add to dashboard Cite

Three hundred and thirty-six day-old Ross-308 male broiler chicks were used in a 35-day trial to investigate the effect of different concentrations of dietary Zn and phytase on broiler performance and energy utilization. Twelve day-old birds were used for the initial slaughter group to provide baseline body compositional data, while the remaining 324 birds were randomly distributed to six experimental diets. The treatments consisted of a 3 x 2 factorial arrangement with three levels of Zn (low, mid, and high; 30, 40, and 50 mg/kg, respectively) and two levels (0, 500 FTU/kg) of microbial phytase. Each dietary treatment was fed to 6 cages (9 birds/cage). Low Zn diet significantly decreased feed intake and body weight gain at days 1-24. Phytase supplementation improved body weight gain at d 24, irrespective of Zn level. The digestibility of P was improved in birds fed high-Zn diet with phytase supplementation, and the reverse was the case for Fe and Zn digestibility. High dietary Zn increased the Zn and Fe deposition in liver. The activity of AP, CaATPase and Mg-ATPase in the jejunum was high in the phytase supplemented mid-level Zn diet. Phytase supplemented to the mid and high level Zn diets significantly improved most energy utilization parameters. This result indicate that the Zn concentrations used in this study were not inhibitory to phytase activity and broiler performance. Therefore, it can be concluded that dietary zinc level in phytase-supplemented diets could be increased up to 50 mg/kg without any negative effect on phytase-mediated broiler response.

show abstract

The effects of supplementary bacterial phytase on dietary energy and total tract amino acid digestibility when fed to young chickens

Cited by 37 publications

References 27 publications

Energy utilisation and growth performance of chicken fed diets containing graded levels of supplementary bacterial phytase

Energy utilisation and growth performance of chicken fed diets containing graded levels of supplementary bacterial phytase

Effect of High Phytase Inclusion Rates on Performance of Broilers Fed Diets Not Severely Limited in Available Phosphorus

Increasing zinc levels in phytase-supplemented diets improves the performance and nutrient utilization of broiler chickens

Contact Info

Product

Resources

About