Effect of dietary phytase supplementation on greenhouse gas emissions from soil after swine manure application

Yitbarek, Alexander; López, Secundino; Tenuta, Mario; Asgedom, Haben; Nyachoti, C. M.; Kebreab, E.

doi:10.1016/j.jclepro.2017.08.079

Cited by 11 publications

(6 citation statements)

References 51 publications

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“…There have not been studies so far which have addressed whether increasing phytase levels (e.g., 0 to 1000 FTU) in animal diets may have cascading effects on soils and plants. Our results partly agree with those of a recent soil incubation study, which show that 'no-phytase' treatment was associated with higher soil-plant P availability (measured as Olsen P index) than a dietary treatment of 500 phytase units (FTU) [24]. As both plant species (comfrey and ryegrass) showed similar responses (high PUE, low WSP) to intermediate 'phytase' treatments, it is likely that such responses were driven by phytase and dietary P content effects on the quality and availability of P forms in pig excretes.…”

Section: Dietary Phytase Effects On the Plant-soil Systemsupporting

confidence: 91%

“…Evidence from incubation studies suggests that phytase addition to poultry diets can either decrease [22] or increase [23] P availability in soils (i.e., water soluble P, WSP). Other studies suggest that soil-plant available P (i.e., Olsen P) was reduced when phytase was added to pig diets [24] or that phytase addition to pig diets did not significantly affect P runoff from soils [25]. Such high variability in soil P dynamics could depend on both soil and manure-specific characteristics [26] but could also be due to lack of information on how plants may mediate soil responses to organic fertilisation.…”

Section: Introductionmentioning

confidence: 99%

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Soil and Plant Responses to Phosphorus Inputs from Different Phytase-Associated Animal Diets

et al. 2022

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The over-supplementation of animal feeds with phosphorus (P) within livestock-production systems leads to high rates of P excretion and thus to high P loads and losses, which negatively impact the natural environment. The addition of phytase to pig and poultry diets can contribute to reducing P excretion; however, cascading effects of phytase on plant–soil systems remain poorly understood. Here, we addressed how three different diets containing various levels of exogenous phytase, i.e., (1) no-phytase, (2) phytase (250 FTU), and (3) superdose phytase (500 FTU) for pigs (Sus scrofa domesticus) and broilers (Gallus gallus domesticus) might affect P dynamics in two different plant–soil systems including comfrey (Symphytum ×uplandicum) and ryegrass (Lolium perenne). We found that differences in phytase supplementation significantly influenced total P content (%) of broiler litter and also pig slurry (although not significantly) as a result of dietary P content. P Use Efficiency (PUE) of comfrey and ryegrass plants was significantly higher under the intermediate ‘phytase’ dose (i.e., commercial dose of 250 FTU) when compared to ‘no-phytase’ and ‘superdose phytase’ associated with pig slurry additions. Soil P availability (i.e., water soluble P, WSP) in both comfrey and ryegrass mesocosms significantly decreased under the intermediate ‘phytase’ treatment following pig slurry additions. Dietary P content effects on P losses from soils (i.e., P leaching) were variable and driven by the type of organic amendment. Our study shows how commercial phytase levels together with higher dietary P contents in pig diets contributed to increase PUE and decrease WSP thus making the plant–soil system more P conservative (i.e., lower risks of P losses). Our evidence is that dietary effects on plant–soil P dynamics are driven by the availability of P forms (for plant uptake) in animal excretes and the type of organic amendment (pig vs. broiler) rather than plant species identity (comfrey vs. ryegrass).

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Section: Dietary Phytase Effects On the Plant-soil Systemsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Soil and Plant Responses to Phosphorus Inputs from Different Phytase-Associated Animal Diets

et al. 2022

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“…Numerous studies have proved that supplementation with phytase can effectively reduce fecal phosphorus emission [ 49 , 50 , 51 ]. Our results show that proper reduction of dietary phosphorus and supplementation with phytase can improve phosphorus utilization and reduce phosphorus emissions.…”

Section: Discussionmentioning

confidence: 99%

Growth Performance, Bone Development and Phosphorus Metabolism in Chicks Fed Diets Supplemented with Phytase Are Associated with Alterations in Gut Microbiota

Zhang

et al. 2022

Animals

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Phosphorus pollution caused by animal husbandry is becoming increasingly problematic, especially where decreasing and non-renewable phosphorus resources are concerned. We investigated the growth performance, bone development, phosphorus metabolism and gut microbiota changes elicited by different phosphorus levels with/without phytase in chicks during the brooding period (1–42 d). Five-hundred-and-forty (540) egg-laying chickens were assigned to six groups (0.13% NPP, 0.29% NPP, 0.45% NPP, 0.13% NPP + P, 0.29% NPP + P and 0.45% NPP + P) according to a factorial design with three non-phytate phosphorus (NPP) levels (0.13, 0.29 and 0.45%) and two phytase (P) dosages (0 and 200 FTU/kg). Chicks fed with the diet with 0.13% NPP had the lowest body weight, average daily gain, shank length, average daily feed intake and highest ratio of feed to gain, while phytase supplementation was able to mitigate the adverse effects of low-phosphorus diets on growth performance. Moreover, phosphorus metabolism was affected by different dietary NPP and phytase levels. Thus, 0.13% NPP significantly reduced serum phosphorus, while phytase supplementation significantly increased serum phosphorus. Notably, phosphorus utilization in the 0.13% NPP group was significantly decreased and the phosphorus excretion ratio was increased. Phytase supplementation significantly improved phosphorus utilization by 43.79% and decreased phosphorus emission in the 0.13% NPP group but not in the 0.29% NPP or the 0.45% NPP group. Remarkably, the alpha diversity of gut microbiota was significantly decreased in the low-phosphorus group, while phytase supplementation increased alpha diversity and improved gut microbial community and function. The LEfSe analysis revealed that several differential genera (e.g., Bacteroides, norank_f__Clostridiales_vadinBB60_group and Eggerthella) were enriched in the different dietary NPP and phytase levels. Furthermore, correlations between differential genera and several crucial phenotypes suggested that the enrichment of beneficial bacteria with different levels of phosphorus and phytase promoted phosphorus utilization in the foregut and hindgut. In summary, low-phosphorus diets inhibited growth performance and bone development, decreased utilization of phosphorus and altered gut microbial structure and function in the brooding stage of chicks. Finally, phytase supplementation improves growth performance and bone development and decreases phosphorus emission, and the potential mechanisms may be associated with the reprogramming of gut microbiota.

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“…Despite continuing research to develop sustainable swine manure management technologies [59,60], most improvements involve adjustments to the current regime rather than radical shifts in technology adoption. Such adjustments include changes to animal diet, implementing comprehensive nutrient management plans, and buy-out programs for farms in flood-prone areas [61][62][63]. Still, to the landscape surrounding the lagoon-sprayfield regime, it may appear largely unchanged from the time the two agreements discussed in this study were brokered in 1999 and 2000 [64][65][66].…”

Section: Discussionmentioning

confidence: 99%

Sustainable Swine Manure Management: A Tale of Two Agreements

et al. 2020

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Intensification and concentration of swine farming has provided economic benefit to rural communities but also negative environmental and human health impacts, particularly from the use of the lagoon-sprayfield system for manure management. Although cost effective, this system is susceptible to poor management, unpleasant odor and other emissions, and inundation during extreme weather events. Competition for manure-spreading acres with other livestock or encroaching development can also pose a problem. This study examines two agreements between industry and government designed to develop and implement improved manure management technologies for swine farms: a voluntary agreement between the attorney general of North Carolina and Smithfield Foods and a consent judgment between the State of Missouri and Premium Standard Farms. Individuals involved in executing these agreements were interviewed to gain insight from their perspective on those processes and lessons they learned from their experience. Common themes among participant responses to support transition processes included the need to involve multiple stakeholder groups, clearly define goals, understand the system, allow time for incremental change, and provide adequate “protected space” for technology development and implementation. Viewing these themes through the lens of multi-level perspective theory identifies leverage points throughout the system to support transitioning farms to a more sustainable path of manure management.

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Effect of dietary phytase supplementation on greenhouse gas emissions from soil after swine manure application

Cited by 11 publications

References 51 publications

Soil and Plant Responses to Phosphorus Inputs from Different Phytase-Associated Animal Diets

Soil and Plant Responses to Phosphorus Inputs from Different Phytase-Associated Animal Diets

Growth Performance, Bone Development and Phosphorus Metabolism in Chicks Fed Diets Supplemented with Phytase Are Associated with Alterations in Gut Microbiota

Sustainable Swine Manure Management: A Tale of Two Agreements

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