Research Summaries: Peas in Livestock Diets
September, 2004
INTRODUCTION

This publication contains comprehensive summaries of research trials conducted with peas for poultry, swine, ruminants and aquaculture. It is the second edition, the first being completed in 1998. The summaries are accompanied by an extensive database, listing pulse and canola research for all species of livestock. Both the database and summaries are an effort to enhance the knowledge of livestock producers, animal scientists, nutritionists and all interested parties on the use of peas as a feed ingredient.

Due to the volume of literature cited here (>3000 technical papers), a complete reference list was not included. Rather, references are available on the Internet at the Pulse-Canola Feed Literature Database (www.infoharvest.ca/pcd). Within the database each reference can be located, complete with title, full author listings, source and in most cases an abstract. Reprints of articles can be ordered.

Funding for this project was provided by the Saskatchewan Pulse Growers.

TABLE OF CONTENTS
Table of Abbreviations
Section I: COMPOSITION OF PEAS
I. Nutrient Composition of Peas
Section II: POULTRY
II. The Use of Peas in Poultry Diets
1.0 Nutrient specifications of Canadian Peas for poultry
1.a Moisture
1.bCrude Protein
1.b.i Protein digestibility
1.cFibre
1.dStarch
1.d.iStarch digestibility
1.eMinerals
1.fEnergy values
1.gAmino acids in feed peas
2.0 Novel Pea Products
2.aIsolated pea components
3.0 Pea varieties not commonly grown in Canada
3.aAgronomics
4.0 Studies Involving Pea-based Rations and Poultry
4.aLayers
4.bBroilers
4.cBroiler Breeders
4.dTurkeys
4.eGeese
4.fPigeons
5.0 Factors Affecting the Utilization of Peas by Poultry
5.aNutrient Accessibility
5.bAntinutritional Factors
5.b.iTrypsin Inhibitors
5.b.iiTannins
5.b.iiiOligosaccharides
5.b.ivLectins
5.b.vSaponins
5.b.viPhytic acid
5.b.viiFibrous Components
6.0 Improving the Nutritional Value of Peas
6.aHeat Processing. 21
6.bGrinding
6.cPelleting, Extrusion and Expansion
6.dDehulling
6.eGenetic Selection
6.fEnzymes
7.0 Conclusion
8.0 Endnotes
Section III: PIGS
III. The Use of Peas in Pig Diets
1.0 Nutritional Assessment of Peas for Pigs
1.1 Amino Acid and Protein Digestibility of Peas
Figure 1 Protein Fractions of Peas adapted from Creveau 1999
a. Pea Protein Concentrate and Isolate
1.2Energy Digestibility of Peas for Pigs
a.Enzyme Addition
1.3Mineral Availability
1.4Antinutritional Factors
a.Trypsin Inhibitors
b.Lectins & Saponins
c.Effects of ANF on pig performance
1.5Pigments
1.6Processing
2.0The Effect of Peas on the Performance of Pigs
2.1Growth Performance of Weanling Pigs Fed Peas
2.2Growth Performance of Grower-Finisher Pigs Fed Peas
a.Pea Screenings
b.Whole Crop Peas
2.3Sow Performance
3.0Carcass Composition of Pigs Fed Peas
4.0Conclusion
Section IV: RUMINANTS
IV. The Use of Peas in Ruminant Diets
1.Pea Composition Relative to Ruminants
1.a Protein content
1.bAmino acid composition
1.cStarch content
1.dFibre content
1.eRumen degradability of peas
1.fIntestinal Digestibility of Peas
2.Peas as a Source of Protein in Milk Replacers for Holstein Calves
2.aNutrient profile of peas
2.bCalf Performance
2.cAntigenicity of Pea-Based Milk Replacers
3.Feeding Peas to Weaned Dairy Calves
4.Feeding peas to Dairy Cattle
4.aFeed intake
4.bMilk yield
4.cFeeding peas to high producing, early lactation or primiparous dairy cattle
4.dFeeding peas to late-lactation or moderately producing dairy cattle
4.eFeeding peas in organic rations
4.fMilk fat
4.gMilk protein
4.hRumen pH
4.iAmmonia-Nitrogen Concentrations
4.jVolatile Fatty Acid Concentrations (VFA)
5.Feeding peas to beef cattle
5.aCreep feeds
5.bGrowing and finishing calves
6.Feeding peas to sheep
7.Improving Pea Nutrition by Processing
7.aProcessing
7.bPelleting
7.cMoist Heat Treatment
7.dPressure Toasting
7.eMicronizing pea meal
7.fExtrusion
7.gExpansion
7.hSteam Flaking
7.iParticle Size
7.jAddition of Formaldehyde to High Protein Legumes
8.Antinutritional Factors
9.The Feeding Value of Peas as Forage, Silage, Straw and Screenings
9.aSilage Use in Dairy Cows and Heifers
9.bSilage Use in Other Cattle
9.cSilage Production
9.c.iMaturity
9.c.iiInoculants
9.dForages
9.eStraw
9.fGrazing
9.gPea Screenings
10. Conclusion
11.Endnotes
Section V: AQUACULTURE
V. The Use of Peas in Aquafeeds
1.0 Introduction
2.0Processing pea for aquaculture feeds
2.1 Heat treatment
2.2Dehulling
2.3Protein concentration
3.0Nutritional Assessment of Pea for Aquaculture Feeds
3.1Digestibility
3.2Growth and performance
3.3Pellet water stability and nutrient discharge
4.0Assessment of the nutritional value of pea for salmonids and other cold water species
4.1Rainbow trout (Oncorhynchus mykiss)
4.2Coho salmon (Oncorhynchus kisutch)
4.3Atlantic salmon (Salmo salar)
4.4Turbot (Psetta maxima)
5.0Assessment of the nutritional value of pea for warm water fish
5.1Tilapia
5.2Australian silver perch (Bidyanus bidyanus)
5.3Australian short-finned eel (Anguilla australis australis)
5.4European sea bass (Dicentrarchus labrax) 89
5.5Gilthead sea bream (Sparus aurata)
5.6Common carp (Cyprinus carpio L.)
5.7Milkfish (Chanos chanos)
5.8Rohu (Indian major carp) (Labeo rohita)
6.0Assessment of the nutritional value of pea for shrimp
6.1Tiger shrimp (Penaeus monodon)
6.2Blue shrimp (Litopenaeus stylirostris) and white shrimp (Litopenaeus vannamei)
7.0Conclusions
Disclaimer

The following reviews are meant to enhance current knowledge on the feeding of peas to livestock. Every effort has been made to ensure the accuracy of the information contained within, however the authors assume no responsibility for errors, inaccuracies, omissions or inconsistencies. It is the responsibility of the reader to use their best judgement in applying this knowledge as no warranty or guarantee is implied or given.

Table of Abbreviations
µg - microgram
AA - amino acid(s)
ADF - acid detergent fibre
ADG - average daily gain
ADICP - acid detergent insoluble crude protein
ADL - acid detergent lignin
AME - apparent metabolizable energy
ANF - antinutritional factor(s)
APD - apparent protein digestibility
CM - canola meal
CP - crude protein
DE - digestible energy
DM - dry matter
FC - feed conversion
FFCS - full-fat canola seed
FFFS - full-fat flax seed
FI - feed intake
g - gram
GL - glucosinolate(s)
kg - kilogram
ME - metabolizable energy
mg - milligram
N - nitrogen
NDF - neutral detergent fibre
NDICP - neutral detergent insoluble crude protein
NE - net energy
NSC - non-structural carbohydrates
NSP - non-starch polysaccharide
NPN - non-protein nitrogen
PPC - pea protein concentrate
RSM - rapeseed meal
S - sulfur
SBM - soybean meal
SCP - soluble crude protein
T3 - tri-iodothyronine
T4 - thyroxine
TIA - trypsin inhibitor activity
TME - true metabolizable energy
TSW - total seed weight
VLGL - very low glucosinolate
vs. - versus

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Index