redesigning forages for sustainable dairy production · dairy nutritionist survey major challenges...
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Redesigning Forages for Sustainable Dairy Production
2007 Intermountain Pre-Nutrition Conference
January 23, Red Lion Hotel, Salt Lake City, UT
Neal P. Martin, R. D. Hatfield, D. R. Mertens and M. D. CaslerUSDA-ARS, Madison, WI
This talk will explore . . .
• Trends in corn silage & alfalfa production and use
• Barriers to increasing alfalfa in dairy diets
• Redesigning alfalfa for dairy cows• Resigning grasses for dairy cows
Trends . . .
Top 10 States–65 % of U. S.–66 % of Acres–6 states NC–2 states NE–2 states West–7 Lead Dairy
Leading Corn Silage States, 2006
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
16,000
1,000 tons
WI CA NY PA MN ID SD IA NE MI
Corn Silage Production - West
0
2000
4000
6000
8000
10000
12000
1,000 tons
CA ID CO NM WA MT UT WY AZ OR NV
2004-06 average
Trends . . .
Top 10 States–61 % of U. S.–56 % of Acres–6 states NC–4 states West–5 Lead Dairy
Leading Alfalfa Forage States, 2006
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
1,000 tons
WI CA ID MN IA NE MI KS MT CO
Alfalfa Forage Production - West
0
1000
2000
3000
4000
5000
6000
7000
8000
1,000 tons
CA ID MT CO WA UT AZ OR WY NV NM
Alfalfa Hay Production
Trends . . .
Trends . . . Alfalfa Silage Production
0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0
VT
NY
WI
PA
MI
OH
MN
ID
IA
IL
NM
TX
MO
CA
WA
NE
SD
KS
% Alfalfa Harvestewd as Haylage, 2006
Trends . . .
Hay acreage remains unchanged
Dairy cattle feeding – declining amounts
For many years the Rule of Thumbfor feeding alfalfa to dairy cattle was. . .
30 %30 %
40 %40 %30 %30 %
Forage or Forage or ConcentrateConcentrate
ConcentrateConcentrate
ForageForage
CA-AZ YIELD TRENDS
Californiay = 0.0467x - 86.223
R2 = 0.9729
Arizonay = 0.0824x - 156.6
R2 = 0.8935
0
1
2
3
4
5
6
7
8
9
1900 1920 1940 1960 1980 2000 2020
Yiel
d (t/
a)
California
Arizona
Alfalfa Yield Trends . . .
CA Hay Production Per Dairy Cow
y = 0.0071x2 - 1.0507x + 52.834R2 = 0.9432
15
20
25
30
35
40
45
50
5519
68
1971
1974
1977
1980
1983
1986
1989
1992
1995
1998
2001
2004
2007
2010
(lbs alfalfa/cow/day)
???
Source: Dan Putnam, 2005 Consortium for Alfalfa Improvement
Competition with corn silage
Why this declining trend?
California
1
3
5
7
9
11
13
15
19951996199719981999200020012002200320042005
Year
Fora
ge P
rodu
ctio
n,
mill
ion
ton
18000
18500
19000
19500
20000
20500
21000
21500
22000
Milk
, lb/
cow
Corn Silage, million ton Alfalfa Hay, million ton Milk, lb/cow
SOURCE: Jim Linn, 2006 NAAIC
Wisconsin
1
3
5
7
9
11
13
15
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Year
Fora
ge P
rodu
ctio
n,
mill
ion
ton
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
20000
Milk
, lb/
cow
Corn Silage, million ton Alfalfa Hay, million ton Milk, lb/cow
SOURCE: Jim Linn, 2006 NAAIC
Competition from byproducts•Canola Meal•Soybean Meal •Cottonseed•Distillers Grains•Bakery By-Products•Almond Hulls•Citrus Pulp•Tomato Pumice•Etc. Etc. Etc. Etc. Etc.
Why this declining trend?
Many of these byproducts are high in protein
Why this declining trend?
protein
protein
protein
proteinprotein
protein
N
Protein SourcesCP, % RDP, %
CPAlfalfa 20+ 70Dist grains -ethanol
30 60
SBM – biodiesel 50 65Corn gluten feed 22 70
Wheat midds 19 75
Corn silage 8 65Corn grain 10 50Dairy Cow Ration <17 65
Blood 87 30
Corn gluten meal 67 45
SOURCE: Jim Linn, 2006 NAAIC
Last updated: Oct. 30, 2006
Forage Fiber Sources –Dairy Rations
Straw – Use is increasing• Low nutrient value• Effective fiber
Hay Price, Particle Size and $Ground hay - Quality (125 – 175 RFV) may
not have extra value
Long hay - Unchopped - Quality has value ($)
SOURCE: Jim Linn, 2006 NAAIC
Key Issues with alfalfa quality/value
• It must be measured• Breaking the yield/quality
tradeoff• Problems with rapid
lignification of alfalfa stems under hot conditions
• Enhancing/complementing other feeds
• Solving Waste ProblemsSOURCE: Putnam, Dan. 2005SOURCE: Putnam, Dan. 2005
Less alfalfa being fed in dairy rations
• Lower yield of alfalfa
than other crops
• Increased use of corn
silage
• Minimized forage in
rationCheap grainGreater quality consistency of grainInability to accurately estimate energy of forage
Dairy Nutritionist Survey
MAJOR CHALLENGES1. Forage quality - consistency2. N and P excretion3. Transition cows4. Ethanol – starch and
Distillers Grains5. Ration formulation –
modeling6. Fiber digestion7. Milk price and feed cost
Source: Hutjens – 2006 ADSA meeting
WATER AVAILABILITY
Dairy Ration Overview
FORAGES
FORAGE, GRAIN OR BYPRODUCTS
CONCENTRATES• CORN• PROTEIN• MINERALS/ADDITIVES
40
40
% OF DM
20
FIBER Physical & Chemical
Protein, minerals, CHO
Non-Fiber CHOStarch
Protein RDP & RUP
Minerals
Nutrient needs and $
We don’t want to see reduced perennial forage crops in rotation because . . .
Perennial forage crops are good for environmentGood for cow health
Challenges . . .
. . . of the dairy forage industry
Research strategies and opportunities . . .. . . of the U.S. Dairy Forage
Research Center
Barriers to increasing alfalfa in dairy dietsRedesigning alfalfa for dairy cows
Improve protein utilizationIncrease fiber digestion
Increase yield
Forage Quality…
Description CP EE Ash Starch Pectin aNDF ADF ADL
ALFALFA HAY
Exceptional 25.4 2.7 10.4 3.1 14.2 30.0 24.0 4.53
Very high 24.0 2.6 9.9 2.9 13.2 34.1 27.0 5.38
High quality 22.5 2.5 9.5 2.7 12.3 38.2 30.0 6.23
Good quality 21.0 2.4 9.1 2.5 11.4 42.2 33.0 7.08
Fair quality 19.5 2.2 8.7 2.3 10.5 46.3 36.0 7.93
CORN SILAGE
V. high grain 8.3 3.2 4.1 31.1 1.7 36.0 21.0 1.57
High grain 8.6 3.1 4.6 27.2 1.6 40.5 24.0 1.91
Normal 8.8 3.0 5.1 23.2 1.5 45.0 27.0 2.25
Low grain 9.0 2.8 5.7 19.2 1.4 49.5 30.0 2.59
V. low grain 9.3 2.7 6.2 15.3 1.3 54.0 33.0 2.93
Source: Mertens, 2003.Source: Mertens, 2003.
Apparent Dry Matter Digestibility of AH and CS
Item AH AH CS proc CS proc
24%ADF 27%ADF 24%ADF 27%ADF
% aNDF 30.0 34.1 40.5 45.0% dNDF 15.6 16.0 24.9 27.3% NDS 70.0 65.9 59.5 55.0% dNDS 68.6 64.6 58.3 53.9% True DMD 84.2 80.6 83.2 81.2
Source: Adapted from Mertens, 2003.
Alfalfa for Dairy Rations
• Currently using harvesting management to improve alfalfa quality– Immature alfalfa has many
appealing nutritional properties• Low in fiber
– High digestibility– High intake potential
• Rapid rate of digestion• High in crude protein
Source: Adapted from Mertens, 2003.
Milk Yield from Alfalfa Silage and Hay Diets
Milk, lbs/day
80
82
84
86
88
90
92
AlfalfaSilage
Silage +FishMeal
AlfalfaHay
Hay +FishMeal
Milk, lbs/day
80
82
84
86
88
90
92
AlfalfaSilage
Silage +FishMeal
AlfalfaHay
Hay +FishMeal
+ 4.0 lbs+ 4.0 lbs + 0.5 lbs+ 0.5 lbs
• Fish meal is beneficial in alfalfa silage diets, but not alfalfa hay diets.
• Bottom line:alfalfa silage nitrogen is not efficiently used by the cow
Source: Vagnoni and Broderick, 1997
Feed Storage ProblemsFeed Storage Problems
However in alfalfa, our primary forage:However in alfalfa, our primary forage:
Feed Storage Problems
• However in alfalfa, our primary forage:
0102030405060708090
% N
FreshAlfalfa
Alfalfa Hay AlfalfaSilage
ProteinNonprotein
FeedProtein
Rumen
Cecum & L.I.
Manure
Escape Feed Protein Absorbed
Protein
S.I.
Microbes
Ammonia & Carbon Skeletons
Carbohydrate
UrineLiver
UreaMilk
RecycledRecycled
Source: Mary Beth HallSource: Mary Beth Hall
Research Challenge/ Opportunity . . .
Protein utilization:high-quality forage reduces N use efficiency . . .leading to higher manurial N loading back to fields . . .creating an increased risk of N leaving farm via runoff, leaching, or ammonia emissions.
Protein utilization: PPO
Polyphenol oxidase (PPO) and o-diphenols --A process for preserving protein in ensiled forages
Polyphenol oxidase (PPO) and o-diphenols in red clover
PPO oxidizes o-diphenols to o-quinonesResponsible for post harvest browningPPO and o-diphenols are abundant in red clover
PPO and o-diphenols prevent post-harvest proteolysis• Evidence for PPO/o-diphenol
role– Alfalfa lacks PPO/o-diphenols– Proteolytic inhibition O2-
dependent» Inhibition involves a heat labile
factor
• Experimental demonstration– Loss-of-function in red clover– Gain-of-function in alfalfa
Expression of red clover PPO1 in transgenic alfalfa
In alfalfa, browning is dependent on:
A PPO transgeneExogenous o-diphenol, e.g. caffeic acid
SOURCE: Sullivan, Michael L. and Ron D. Hatfield. 2003 DFRC ReSOURCE: Sullivan, Michael L. and Ron D. Hatfield. 2003 DFRC Research Reportsearch Report
Red Clover vs. Alfalfa Silage
020
406080
100120
Red clover Alfalfa Alfalfa +Caffeic acid
PPO Alfalfa PPO Alfalfa+ Caffeic
acid
Protein breakdown (% of alfalfa)Protein breakdown (% of alfalfa)
Protein Utilization: Tannins
Tannins have been shown to improve protein utilization and animal performance.
Milk Yield (lbs/day)-Alfalfa and Birdsfoot Trefoil Silages
60
65
70
75
80
85
Alfalfa Low TanninTrefoil
NormalTrefoil
High TanninTrefoil
60
65
70
75
80
85
Alfalfa Low TanninTrefoil
NormalTrefoil
High TanninTrefoil
HymesHymes--Fecht et al., 2005Fecht et al., 2005
+ 11 lbs+ 11 lbs
Added value of forage with tannin (per ton dry matter)
Alfalfa silage $ 23
Alfalfa hay $ 11
Some compounds bind with alfalfa protein to decrease rate of post-harvest proteolysis. Transgenic alfalfa will be produced that contain these compounds.
Tannins – altered expression of genes for alfalfa tannin biosynthesisPolyphenol oxidase (PPO) – gene isolated from red clover (USDA)
Strategies: reducing post-harvest proteolysis in alfalfa silage
Research Challenge/ Opportunity . . .
. . . fiber digestion
Apparent Dry Matter Digestibility of AH and CS
Item AH AH CS proc CS proc24ADF 27ADF 24ADF 27ADF
% aNDF 30.0 34.1 40.5 45.0% dNDF 15.6 16.0 24.9 27.3% NDS 70.0 65.9 59.5 55.0% dNDS 68.6 64.6 58.3 53.9% True DMD84.2 80.6 83.2 81.2
Source: Adapted from Mertens, 2003.
NDF Digestibility of Alfalfa Stems
50 54 58 62 66 70
NDF Concentration (% DM)
30
36
42
48
54
60
ND
F D
iges
tibili
ty
Source: Jung and Lamb, 2002. Unpub USDA-ARS. St. Paul, MN
•Engineering the lignin biosynthetic pathway in alfalfa
Down regulation
Low Lignin Alfalfa…Higher Fiber Digestibility
WL342 null T1 T2
85
95
105
115
125
135
% n
ull c
ontr
ol
Lignin
NDFD
Fiber digestibility of alfalfa Fiber digestibility of alfalfa stems in transgenic lines at stems in transgenic lines at Nampa, ID.Nampa, ID.
Transgenic plants have Transgenic plants have been generated that been generated that show decreased lignin show decreased lignin content and increased content and increased fiber digestibility.fiber digestibility.
Source: McCaslin et. al., 2002Source: McCaslin et. al., 2002
Alfalfa Improvement Opportunities
• Modify fiber composition–Replace with soluble CHO (pectin,
etc.)• Improve fiber digestibility
–Lower lignin–Modify lignin–Replace lignin with cellulose–Reduce physical limitations– Increase rate of digestion
Redesign Alfalfa for Dairy Cattle
Consortium for Alfalfa Improvement
• Noble Foundation
• Forage Genetics International
• Plant Science Research Unit, USDA-ARS
• US Dairy Forage Research Center, USDA-ARS
Grasses for Hay, Silage, Pasture
Grasses for Hay or Silage
• Badger smooth bromegrass -high digestibility
• Alpha smooth bromegrass -high digestibility and persistence with alfalfa
Pasture grasses• Albert orchardgrass
- high forage and seed yield, good quality, excellent disease resistance.
• Spring Green festulolium– Superior cold tolerance and winter
survival.– Over 1 million pounds of seed sold.– Will be available in 2005 as certified
organic seed.
New Pasture Grasses for 2006/07 (Listed by experimental names)
• WR00 & WR04 Reed canarygrass -improved, more rapid, stand establishment.
New Pasture Grasses for 2006/07 (Listed by experimental names)
• WMF1 Meadow fescue - superior forage yield, palatability, acceptance, and intake under management-intensive rotational grazing.
• WCO1 Festulolium - improved cold tolerance and winterhardiness, high palatibility and acceptance, excellent disease resistance.
Corn silage, alfalfa and perennial grasses main forage fed to dairy cowsDetermining attributes of ideal forage for harvest or grazing needs holistic approach
Summary
Ideal attributes – plant modificationThose that increase milk potential (per acre or per ton)Enhance digestible NDFImprove protein utilizationIncrease sugar contentReduce incidence of bloatImprove agronomic traits (insect, weed, virus, drought and cold tolerance)Increase mineral availabilityEnhance yield
Progress in attaining these attributes has been slow using traditional plant breeding, but will accelerate with the use of biotechnology
Summary
http://ars.usda.gov/mwa/madison/dfrc
Any
questions ?