The effect of microbial phytase in diets for pigs on apparent ileal and faecal digestibility, pH and flow of digesta measurements in growing pigs fed a high-fibre diet

Bruce, J. A. M.; Sundstøl, F.

doi:10.4141/cjas95-016

Cited by 38 publications

(23 citation statements)

References 11 publications

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“…Thacker et al (2003) reported DM digestibility coefficients of 0.77 and 0.74 when swine were fed normal-and low-phytate barley diets, respectively, and were similar to the values obtained for these treatments in the present study. Bruce and Sundstøl (1995) reported a DM digestibility coefficient for oat-based diets of 0.76, which is similar to the value of 0.74 obtained in the present study. Leytem and Thacker (2008) reported apparent P digestibility coefficients of 0.11, 0.26, 0.35, 0.26, and 0.46 for corn, barley, low-phytate barley, high-fat-lowlignin oat, and wheat diets, respectively (cereal content was 97% of the diet).…”

Section: Discussionsupporting

confidence: 80%

Phosphorus utilization and characterization of excreta from swine fed diets containing a variety of cereal grains balanced for total phosphorus1

Leytem

Thacker

2010

Journal of Animal Science

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the World Wide Web at:The online version of this article, along with updated information and services, is located on www.asas.org at University of Idaho Library #2 on June 28, 2010. jas.fass.org Downloaded from ABSTRACT: Intrinsic phytase in swine feeds may increase phytate utilization and alter the solubility of the excreted P. The objective of this experiment was to quantify changes in fecal P composition from swine fed a variety of cereal grains containing a range of phytate concentrations and endogenous phytase activities. Twenty-five crossbred barrows (89.3 ± 6.8 kg) were fed 1 of 5 dietary treatments that were based on wheat, corn, barley, low-phytate barley, or high-fat-low-lignin oats. Experimental diets were formulated to contain 75% of the test grain and were fed for a 7-d acclimation period followed by a 3-d fecal collection period. Total-tract apparent digestibility coefficients were determined for DM, P, and phytate using an indicator method. Fecal P was characterized using solution-state 31 P nuclear magnetic resonance spectroscopy. Watersoluble P (WSP) and WSP-to-total P (TP) ratio were determined in the feces. Apparent total-tract digestibility coefficients for P and phytate ranged from 0.33 (barley) to 0.45 (low-phytate barley) and from 0.20 (corn) to 0.79 (oats), respectively. The majority of P excreted in the feces was in the form of phosphate (>47% of TP), and phytate degradation was not related to the endogenous phytase activity in the diet. There was a positive linear relationship between dietary NDF and apparent total-tract phytate digestibility (r 2 = 0.82; P = 0.03), indicating that greater dietary fiber content may enhance microbial breakdown of phytate in the hindgut. There was a negative relationship between the fecal WSP-to-TP ratio and the percentage of TP that was in the form of phytate in the feces. In summary, our results indicate that the majority of P in the feces of pigs fed diets based on cereal grains is present in the form of phosphate and relatively small amounts of phytate were contained in the excreta. The exception to this was the corn diet, for which 45% of the total fecal P was in the form of phytate. Hydrolysis of phytate in the gut did not appear to be related to the content of either phytate or phytase in the grain, but was related to dietary fiber concentration.

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Section: Discussionsupporting

confidence: 80%

Phosphorus utilization and characterization of excreta from swine fed diets containing a variety of cereal grains balanced for total phosphorus1

Leytem

Thacker

2010

Journal of Animal Science

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“…This is in agreement with prior reports by Bruce and Sundstol (1995), O'Quinn et al (1997), Sands (2002), Walz and Pallauf (2003) and Zobač et al (2004), who found that phytase had no effect on N digestibility. In the present experiment, phytase also failed to improve N retention, similarly like in experiments by Valaja et al (1998), Walz and Pallauf (2003) and Johnston et al (2004).…”

Section: Discussionsupporting

confidence: 83%

Effect of microbial phytase on apparent digestibility and retention of phosphorus and nitrogen in growing pigs

Patráš¹,

Nitrayová²,

Sommer³

et al. 2006

CZECH J ANIM SCI

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Six female pigs of approximately 50 kg BW, fitted with simple T-cannula in the terminal ileum, were used to study the effect of microbial phytase on apparent total tract digestibility and retention of P and N. Three P-adequate diets (digestible P concentration 2.3 g/kg) containing barley (B), soybean meal (S) or their mixture (BS) with or without phytase supplement (1 000 FTU/kg) were fed to pigs using a 6 × 6 Latin square design. The addition of phytase increased (P < 0.05) apparent total P digestibility of diets S and BS from 56.5 and 57.2% to 69.0 and 65.2%, respectively, and apparent plant P digestibility of the same diets from 41.3 and 50.0% to 60.5 and 60.0%, respectively. An insignificant improvement in total and plant P digestibilities was found in diet B. Phytase supplementation reduced (P < 0.05) P excretion in pigs fed diets S and BS by 25 and 14%, respectively. As compared with diets S and BS, urinary P excretion in pigs fed diet B was much higher, which suggests a lower requirement for available P due to the lower protein deposition and growth rate. Phytase supplementation had no effect on digestibility or retention of N. In all three diets, total tract P digestibility was lower (P < 0.05) than ileal digestibility thus indicating a net flux of P into the large intestine.

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“…Previous results regarding the effects of the addition of phytase on calcium digestibility are less conclusive with Mroz et al (1994), Kemme et al (1997) and Traylor et al (2001) showing positive effects while Simons et al (1990), Bruce and Sundstol (1995) and Sands et al (2001) reported no improvement in calcium digestibility as a result of phytase supplementation.…”

Section: Resultsmentioning

confidence: 81%

The effects of phytase supplementation on nutrient digestibility, plasma parameters, performance and carcass traits of pigs fed diets based on low-phytate barley without inorganic phosphorus

Thacker¹,

Rossnagel²,

Raboy³

2006

Can. J. Anim. Sci.

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Thacker, P. A., Rossnagel, B. G. and Raboy, V. 2006. The effects of phytase supplementation on nutrient digestibility, plasma parameters, performance and carcass traits of pigs fed diets based on low-phytate barley without inorganic phosphorus. Can. J. Anim. Sci. 86: 245-254. A total of 80 crossbred pigs (25.5 ± 2.6 kg) were assigned to one of eight dietary treatments. A positive control, based on Harrington barley, was formulated to meet requirements for total phosphorus. Three experimental diets (low in total phosphorus) were formulated based on either Harrington barley (0.28% phytate phosphorus) or the low phytate genotypes LP422 (0.14% phytate phosphorus) and LP 635 (0.09% phytate phosphorus). The four diets were fed with and without 1000 FTU kg -1 phytase. Calcium and phosphorus digestibility were significantly higher (P < 0.05) as a result of supplementation with phytase. For the barley diets formulated without dicalcium phosphate, calcium digestibility averaged 69.6, 73.3 and 72.2% while phosphorus digestibility averaged 36.5, 50.5 and 57.7% for pigs fed the Harrington, LP 422 and LP 635 diets, respectively. The addition of phytase to the diet consistently reduced the percentage of phosphorus excreted in feces and fecal phosphorus excretion declined as the level of phytate in the barley declined. The addition of phytase tended to improve weight gain (P < 0.10) and significantly improved feed conversion (P < 0.05). For pigs fed the barley diets formulated without dicalcium phosphate, daily gain averaged 0.90, 0.99 and 1.01 kg d -1 while feed conversion averaged 2.70, 2.39 and 2.38 for the Harrington, LP 422 and LP 635 diets, respectively. The overall results of this experiment indicate that the performance of pigs fed diets containing low-phytate barley formulated without a source of inorganic phosphorus is at least equal to that of pigs fed diets containing normal-phytate barley and inorganic phosphorus. In addition, the increased availability of organic phosphorus reduced the amount of phosphorus excreted thus reducing the amount of phosphorus that can potentially pollute the environment.Key words: Low phytate barley, phytase, pigs, performance, digestibility Thacker, P. A., Rossnagel, B. G. et Raboy, V. 2006. Incidence d'un supplément de phytase sur la digestibilité des nutriments, les paramètres sanguins, le rendement et les caractéristiques de la carcasse des porcs nourris d'orge à faible teneur en phytate sans addition de phosphore inorganique. Can. J. Anim. Sci. 86: 245-254. Les auteurs ont réparti 80 porcs hybrides (25,5 ± 2,6 kg) entre huit régimes. Ils ont préparé une ration témoin avec de l'orge Harrington de manière à ce qu'elle réponde aux besoins en phosphore des animaux. Trois rations expérimentales (faible teneur en phosphore) ont ensuite été préparées avec de l'orge Harrington (0,28 % de phytate phosphoré) ou un des génotypes à faible teneur en phytate LP422 (0,14 % de phytate phosphoré) ou LP635 (0,09 % de phytate phosphoré). Les quatre rations ont été servies avec ou sans 1 000 UI de phy...

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The effect of microbial phytase in diets for pigs on apparent ileal and faecal digestibility, pH and flow of digesta measurements in growing pigs fed a high-fibre diet

Cited by 38 publications

References 11 publications

Phosphorus utilization and characterization of excreta from swine fed diets containing a variety of cereal grains balanced for total phosphorus1

Phosphorus utilization and characterization of excreta from swine fed diets containing a variety of cereal grains balanced for total phosphorus1

Effect of microbial phytase on apparent digestibility and retention of phosphorus and nitrogen in growing pigs

The effects of phytase supplementation on nutrient digestibility, plasma parameters, performance and carcass traits of pigs fed diets based on low-phytate barley without inorganic phosphorus

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