Can dietary manipulations improve the productivity of pigs with lower environmental and economic cost? A global meta-analysis

Hongliang Wang, Weitong Long, Dave Chadwick, Gerard L. Velthof, Oene Oenema, Wenqi Ma, Junjun Wang, Wei Qin, Yong Hou*, Fusuo Zhang

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Inappropriate management of pig manure contributes considerably to pollution of waterbodies by nitrogen (N) and phosphorus (P), and to air pollution by ammonia (NH3) and hydrogen sulfide (H2S) emissions. Dietary manipulation is recognized as a possible pollution mitigation measure, but it may affect pig growth and thereby production costs. Here we present a global meta-analysis of the effects of dietary manipulation on nutrient (N and P) excretion, gaseous (NH3 and H2S) emissions from manure, and growth performance of pigs, using data from 245 published studies. Four groups of dietary manipulation were distinguished, namely i) lowering dietary crude protein (CP) content, (ii) supplementing exogenous enzymes, (iii) supplementing fermented feed ingredients, and (iv) supplementing other additives (e.g. fermentable carbohydrates, acidifying agent/salts and probiotics) in feed. In addition, the cost-effectiveness of dietary manipulations was evaluated, expressed as US $ per kg N excretion abated. Results show that lowering CP content significantly reduced both total N excretion (28.5%) and NH3 emissions (34.4%). Addition of protease reduced N excretion (18.2%) but did not affect NH3 emissions. Supplementing other additives simultaneously reduced NH3 emissions (21.5%) and H2S emissions (23.2%). Adding phytase to feed significantly decreased total P excretion by 31.4%. Diets with fermented feed ingredients tended to decrease N excretion and emissions, but this effect was not statistically significant. All dietary manipulations significantly improved the growth performance regarding the weight gain and feed efficiency, except for lowering CP content. But lowering dietary CP content within a moderate level in combination with adding additional amino acids did not impair pig growth. The cost-effectiveness analysis indicated that various diary manipulation measures were economically beneficial to farmers through improved feed-to-meat conversion efficiency. Our results can support to the design of proper dietary formulations so as to simultaneously reduce N and P excretion and associated emissions, meanwhile enhance the growth performance of pigs with lower economic cost.

Original languageEnglish
Article number106748
JournalAgriculture, Ecosystems and Environment
Volume289
DOIs
Publication statusPublished - 15 Feb 2020

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economic costs
meta-analysis
pig
excretion
productivity
swine
ammonia
economics
cost
crude protein
protein content
growth performance
protein
cost effectiveness
manure
ingredients
pollution
probiotics
cost analysis
hydrogen sulfide

Keywords

  • Ammonia emissions
  • Hydrogen sulfide
  • Livestock sustainability
  • Nitrogen
  • Phosphorus
  • Weight gain

Cite this

Wang, Hongliang ; Long, Weitong ; Chadwick, Dave ; Velthof, Gerard L. ; Oenema, Oene ; Ma, Wenqi ; Wang, Junjun ; Qin, Wei ; Hou, Yong ; Zhang, Fusuo. / Can dietary manipulations improve the productivity of pigs with lower environmental and economic cost? A global meta-analysis. In: Agriculture, Ecosystems and Environment. 2020 ; Vol. 289.
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abstract = "Inappropriate management of pig manure contributes considerably to pollution of waterbodies by nitrogen (N) and phosphorus (P), and to air pollution by ammonia (NH3) and hydrogen sulfide (H2S) emissions. Dietary manipulation is recognized as a possible pollution mitigation measure, but it may affect pig growth and thereby production costs. Here we present a global meta-analysis of the effects of dietary manipulation on nutrient (N and P) excretion, gaseous (NH3 and H2S) emissions from manure, and growth performance of pigs, using data from 245 published studies. Four groups of dietary manipulation were distinguished, namely i) lowering dietary crude protein (CP) content, (ii) supplementing exogenous enzymes, (iii) supplementing fermented feed ingredients, and (iv) supplementing other additives (e.g. fermentable carbohydrates, acidifying agent/salts and probiotics) in feed. In addition, the cost-effectiveness of dietary manipulations was evaluated, expressed as US $ per kg N excretion abated. Results show that lowering CP content significantly reduced both total N excretion (28.5{\%}) and NH3 emissions (34.4{\%}). Addition of protease reduced N excretion (18.2{\%}) but did not affect NH3 emissions. Supplementing other additives simultaneously reduced NH3 emissions (21.5{\%}) and H2S emissions (23.2{\%}). Adding phytase to feed significantly decreased total P excretion by 31.4{\%}. Diets with fermented feed ingredients tended to decrease N excretion and emissions, but this effect was not statistically significant. All dietary manipulations significantly improved the growth performance regarding the weight gain and feed efficiency, except for lowering CP content. But lowering dietary CP content within a moderate level in combination with adding additional amino acids did not impair pig growth. The cost-effectiveness analysis indicated that various diary manipulation measures were economically beneficial to farmers through improved feed-to-meat conversion efficiency. Our results can support to the design of proper dietary formulations so as to simultaneously reduce N and P excretion and associated emissions, meanwhile enhance the growth performance of pigs with lower economic cost.",
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Can dietary manipulations improve the productivity of pigs with lower environmental and economic cost? A global meta-analysis. / Wang, Hongliang; Long, Weitong; Chadwick, Dave; Velthof, Gerard L.; Oenema, Oene; Ma, Wenqi; Wang, Junjun; Qin, Wei; Hou, Yong; Zhang, Fusuo.

In: Agriculture, Ecosystems and Environment, Vol. 289, 106748, 15.02.2020.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Can dietary manipulations improve the productivity of pigs with lower environmental and economic cost? A global meta-analysis

AU - Wang, Hongliang

AU - Long, Weitong

AU - Chadwick, Dave

AU - Velthof, Gerard L.

AU - Oenema, Oene

AU - Ma, Wenqi

AU - Wang, Junjun

AU - Qin, Wei

AU - Hou, Yong

AU - Zhang, Fusuo

PY - 2020/2/15

Y1 - 2020/2/15

N2 - Inappropriate management of pig manure contributes considerably to pollution of waterbodies by nitrogen (N) and phosphorus (P), and to air pollution by ammonia (NH3) and hydrogen sulfide (H2S) emissions. Dietary manipulation is recognized as a possible pollution mitigation measure, but it may affect pig growth and thereby production costs. Here we present a global meta-analysis of the effects of dietary manipulation on nutrient (N and P) excretion, gaseous (NH3 and H2S) emissions from manure, and growth performance of pigs, using data from 245 published studies. Four groups of dietary manipulation were distinguished, namely i) lowering dietary crude protein (CP) content, (ii) supplementing exogenous enzymes, (iii) supplementing fermented feed ingredients, and (iv) supplementing other additives (e.g. fermentable carbohydrates, acidifying agent/salts and probiotics) in feed. In addition, the cost-effectiveness of dietary manipulations was evaluated, expressed as US $ per kg N excretion abated. Results show that lowering CP content significantly reduced both total N excretion (28.5%) and NH3 emissions (34.4%). Addition of protease reduced N excretion (18.2%) but did not affect NH3 emissions. Supplementing other additives simultaneously reduced NH3 emissions (21.5%) and H2S emissions (23.2%). Adding phytase to feed significantly decreased total P excretion by 31.4%. Diets with fermented feed ingredients tended to decrease N excretion and emissions, but this effect was not statistically significant. All dietary manipulations significantly improved the growth performance regarding the weight gain and feed efficiency, except for lowering CP content. But lowering dietary CP content within a moderate level in combination with adding additional amino acids did not impair pig growth. The cost-effectiveness analysis indicated that various diary manipulation measures were economically beneficial to farmers through improved feed-to-meat conversion efficiency. Our results can support to the design of proper dietary formulations so as to simultaneously reduce N and P excretion and associated emissions, meanwhile enhance the growth performance of pigs with lower economic cost.

AB - Inappropriate management of pig manure contributes considerably to pollution of waterbodies by nitrogen (N) and phosphorus (P), and to air pollution by ammonia (NH3) and hydrogen sulfide (H2S) emissions. Dietary manipulation is recognized as a possible pollution mitigation measure, but it may affect pig growth and thereby production costs. Here we present a global meta-analysis of the effects of dietary manipulation on nutrient (N and P) excretion, gaseous (NH3 and H2S) emissions from manure, and growth performance of pigs, using data from 245 published studies. Four groups of dietary manipulation were distinguished, namely i) lowering dietary crude protein (CP) content, (ii) supplementing exogenous enzymes, (iii) supplementing fermented feed ingredients, and (iv) supplementing other additives (e.g. fermentable carbohydrates, acidifying agent/salts and probiotics) in feed. In addition, the cost-effectiveness of dietary manipulations was evaluated, expressed as US $ per kg N excretion abated. Results show that lowering CP content significantly reduced both total N excretion (28.5%) and NH3 emissions (34.4%). Addition of protease reduced N excretion (18.2%) but did not affect NH3 emissions. Supplementing other additives simultaneously reduced NH3 emissions (21.5%) and H2S emissions (23.2%). Adding phytase to feed significantly decreased total P excretion by 31.4%. Diets with fermented feed ingredients tended to decrease N excretion and emissions, but this effect was not statistically significant. All dietary manipulations significantly improved the growth performance regarding the weight gain and feed efficiency, except for lowering CP content. But lowering dietary CP content within a moderate level in combination with adding additional amino acids did not impair pig growth. The cost-effectiveness analysis indicated that various diary manipulation measures were economically beneficial to farmers through improved feed-to-meat conversion efficiency. Our results can support to the design of proper dietary formulations so as to simultaneously reduce N and P excretion and associated emissions, meanwhile enhance the growth performance of pigs with lower economic cost.

KW - Ammonia emissions

KW - Hydrogen sulfide

KW - Livestock sustainability

KW - Nitrogen

KW - Phosphorus

KW - Weight gain

U2 - 10.1016/j.agee.2019.106748

DO - 10.1016/j.agee.2019.106748

M3 - Article

VL - 289

JO - Agriculture, Ecosystems and Environment

JF - Agriculture, Ecosystems and Environment

SN - 0167-8809

M1 - 106748

ER -