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![Page 1: Animal Nutrition and Phosphorus Excretion in Beef and Swine Wendy Powers Department of Animal Science Iowa State University.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d995503460f94a838d7/html5/thumbnails/1.jpg)
Animal Nutrition and Phosphorus Excretion in Beef and Swine
Wendy Powers
Department of Animal Science
Iowa State University
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Opportunities
• Monogastrics– Phytase– Low phytate grains– Phytase enhancers and alternatives
• Ruminants– Wider array of feed ingredients– Moving towards better feel for requirements– Total P = Available P
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Phytase effects on P excretion
• When used properly, as much as a 25% reduction in P excretion– Includes impact of reducing diet P to
requirements– Smaller effect if not reducing diet P
sufficiently– Smaller effect if already feeding a P needs
• No negative effects on soluble P excretion
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Low-phytate grains
• HAP corn – Similar effect as with phytase– Additive effect when combined with phytase
• Low phytate soybeans– New research findings
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Swine excretion and performance effects of low-phytate soybeans
• Quantify total and water-soluble excretion from swine fed low-phytate soybean meal alone and with supplementary phytase.
• Determine if feeding low-phytate soybean meal has any adverse effects on swine performance.
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Materials and MethodsDiets
• Four dietary treatments– Control soybeans, no phytase (NP – np)– Control soybeans, phytase (NP – p)– Low-phytate soybeans, no phytase (LP – np)– Low-phytate soybeans, phytase (LP – p)– Each contained 1% indigestible marker
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Materials and MethodsPigs
• 96 pigs, allocated to 24 pens– Initial average BW = 18 kg
• 10-wk trial– Final average BW = 83 kg
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Materials and Methods
• Individual pigs were weighed weekly
• Feed was offered daily and refusals were weighed weekly
• Individual fecal and urine samples collected weekly– Pooled by pen
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ResultsAnimal Performance
• No diet, phytase, or soybean effects on– ADG (0.98 kg)– ADFI (1.94 kg)– F:G (2.03)
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ResultsNutrient Retention
• No diet, phytase, or soybean effects on DM or OM retention (83.7%, 86.5%, respectively)
• P retention– Greater in low-phytate soybean diets
• 49.1% vs. 42.3%
– Greater in diets with phytase• 47.3% vs. 44.1%
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ResultsPhosphorus Excretion
TP, g per kg WSP, g per kg
WSP, % of TP
NP - np 19.7 10.9 0.56
NP - p 18.1 10.2 0.57
LP - np 16.7 8.9 0. 54
LP - p 13.9 8.2 0.60
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ResultsPhosphorus Excretion
TP, g per kg WSP, g per kg
WSP, % of TP
Control soybeans
19.0a 10.5a 0.56
Low-phytate soybeans
15.3b
(-19.5%)
8.7b
(-17%)
0.57
Phytase added
15.9a
(-14%)
9.3a
(-6%)
0.59a
No phytase 18.4b 9.9b 0.55b
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Conclusions
• Low-phytate soybeans resulted in reduced mass of TP and WSP excreted
• Including phytase in the diets, yielded an even further reduction in TP and WSP
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Implications
• Assuming fecal masses do not differ by diet….• Assuming no diet effects in fecal P when pigs >
180 lb….• Assuming fecal production is uniform over the
grow-finish phase….
• Low-phytate soybeans resulted in a 12% reduction in TP excretion over the grow-finish phase
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P Intake, Retention and Excretion
12.2 g
26 g
13.8 g12.2g
6.38 lb bird 1.93 feed to gain 49 days of age RA0109 exp results
36.2g P
17.1g P
17.1g P
Agristats, 1999 (control)
Industry+Phy
30.8g P
13.8 g P19.3 %
17.0g P
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P Intake, Retention and Excretion
12.2 g
26 g
13.8 g12.2g
6.38 lb bird 1.93 feed to gain 49 days of age RA0109 exp results
36.2g P
17.1g P
17.1g P
Agristats, 1999 (control)
UMD Rcmd
31.7g P
14.8 g P22.5 %
16.9g P
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P Intake, Retention and Excretion
12.2 g
26 g
13.8 g12.2g
6.38 lb bird 1.93 feed to gain 49 days of age RA0109 exp results
36.2g P
17.1g P
17.1g P
Agristats, 1999 (control)
UMD Rcmd+Phy
28.8g P
11.9 g P30.5 %
16.9g P
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P Intake, Retention and Excretion
12.2 g
26 g
13.8 g12.2g
6.38 lb bird 1.93 feed to gain 49 days of age RA0109 exp results
36.2g P
17.1g P
17.1g P
Agristats, 1999 (control)
UMD Rcmd+Phy+25OHD3
26.8g P
10.0 g P41.5 %
16.8g P
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Citric acid improving phytate-P utilization
• CA alone – phytate degradation from 42% to 69% in whole wheat flour during bread baking
• CA + exogenous phytase - phytate degradation up to 85%
• CA alone, CA + phytase, CA + phytase + ascorbic acid iron dialyzability 12-, 15-, and 24-fold, respectively
Porres et al., 2001. J. Food Sci. 66(4):614-619
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Combined nPP Sparing Effect of Phytase, Citric Acid and 25-Hydroxycholecalciferol
0
0.05
0.1
0.15
Exp 1 Exp 2 Exp 3
70ug 25OHD3
3% Citric Acid
500 U/kg Phytase
Angel et al., 2001
0.114%
0.144%0.147%
SEM 0.016 0.012 0.013
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Opportunities
• Monogastrics– Phytase– Low phytate grains– Phytase enhancers and alternatives
• Ruminants– Wider array of feed ingredients– Moving towards better feel for requirements– Total P = Available P
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P content of various feedsCorn grain 0.35 Citrus pulp 0.12
Barley 0.39 Brewer’s grains 0.67
Wheat 0.43 Bakery waste 0.36
Sorghum 0.35 Whole cottonseed 0.60
Alfalfa hay 0.30 Fishmeal 3.05
Corn silage 0.26 Urea 0
SMB 0.70 Canola meal 1.10
DDGs 0.80 Beet pulp 0.09
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Feedlot pen
7.2 lbintake
1.9 lbanimal
5.3 lbexcreted
Summer-Yearlings
12.8 lbintake
1.9 lbanimal
10.9 lbexcreted
.35 % P diet
.24 % P diet
REDUCED44 %
P Mass Balance (continued)
Source: Erickson et al., 2000
REDUCED
52%
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9.9 lbintake
2.4 lbanimal
7.5 lbexcreted
Winter/spring-Calves
15.0 lbintake
2.5 lbanimal
12.5 lbexcreted
P Mass Balance (continued)
Source: Erickson et al., 2000
REDUCED33 %
.40 % P diet
.26 % P diet
Feedlot pen
REDUCED
40%
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Challenges
• Monogastrics– In vivo phytase efficacy is not 100%– Commercial availability of LP grains– Grain P > P needs– Pressure to feed DDGs
• Ruminants– Grain P > P needs– Pressure to feed DDGs
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Challenges
00.10.20.30.40.50.60.70.80.9
1
9 15 31 60 105 169 255
Pig weight, lb
Total P, %
Avail P, %
Soybean meal
Corn
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0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
85% corn 85% corn +supplement
byproduct byproduct +supplement
% d
iet
P (
DM
-ba
sis)
supplementbyproductcornroughage
.27.35
.52
.59
Dietary P in Feedlot Diets
Req.
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Phosphorus content of common byproduct feeds
Feed %P(DM)
Feed %P(DM)
WDGS 0.65 Corn 0.35MWDGS 0.65 SBM 0.70DDGS 0.65DDGS(NRC) 0.83CCDS 1.00Corn glutenfeed
0.90
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Acreage NeedsFeed, lb DM/d Corn-soy DDGS-CDS
Corn silage 12 12
Corn 7 -
SBM 2 -
DDGS - 6.25
CDS - 1
P land needs(acre/hd-yr)
0.61 0.90
** Both diets high in energy
***DDGS-CDS diet also high in CP and P
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Acreage Needs
Feed, lb DM/d Corn WDGSCorn cobs 12.6 14.4SBM 3.4 2.7Corn 3.4 -DDGs - 2.2Dical .08 .08
P land needs(acres/hd-yr)
0.63 0.65
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Digestibility of byproduct feeds
• Creates a greater volume of manure
Ingredient, lb/100 lb diet WCGF All corn Dry-rolled corn 43.5 88.8 WCGF 41.5 - Corn silage 5.0 - Alfalfa hay 5.0 - Molasses - 6.2 Ground corn 2.72 1.92 Minerals + urea 2.28 3.08 Feces recovered 7.2 kg 3.53 kg
Bierman et al., 1999. JAS
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Critical to sample manure
• Diet impacts on P concentration
• Diet impacts on manure mass, independent of P content, but affects P concentration
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Summary
• Slowly making nutritional headway towards reducing P excretion
• Opportunities continue to arise
• Still searching for the low P grains
• Endogenous losses prevent 0 P excretion– Feeding through the animal is an inefficient
means of getting P to the land!