consequence for u.s. dairy herds of imposing different scc standards
DESCRIPTION
Consequence for U.S. dairy herds of imposing different SCC standards. U.S. milk quality measures. Bulk tank somatic cell count (BT-SCC) Monitored by USDA Data from 4 of 10 FMOs Accounts for nearly 50% of U.S. milk supply Herd test-day somatic cell count (TD-SCC) Herds in DHI - PowerPoint PPT PresentationTRANSCRIPT
H. Duane NormanAnimal Improvement Programs LaboratoryAgricultural Research Service, USDA Beltsville, MD 20705-2350
NMC – 2011 (1)
Consequence for U.S. dairy herds of imposing different SCC standards
NormanNMC – 2011 (2)
U.S. milk quality measures
Bulk tank somatic cell count (BT-SCC) Monitored by USDA Data from 4 of 10 FMOs Accounts for nearly 50% of U.S. milk
supply
Herd test-day somatic cell count (TD-SCC) Herds in DHI Accounts for 94% of U.S. DHI herds
NormanNMC – 2011 (3)
U.S. SCC (all breeds)
NormanNMC – 2011 (4)
BT-SCC limits
Country
SCC limit(cells/mL)
Australia 400KCanada 500KE.U. 400KNew Zealand 400KNorway 400KSwitzerland 400KU.S. 750K
CA 600K
NMPFproposed SCC limits
Date Cells/mL1-1-2012 600K1-1-2013 500K1-1-2014 400K
NormanNMC – 2011 (5)
U.S. versus E.U. SCC monitoring
Individual farmIndividual farmSCC sample
2 consecutive3-month means over limit
3 of 5 consecutive samples over limit
Producer suspension
Geometric mean of 3 monthly BT-SCC
Consecutive monthly BT-SCC
Value used
400K cells/mL750K cells/mLBT-SCC limit
E.U.U.S.Program characteristic
NormanNMC – 2011 (6)
Export concerns
E.U. change in SCC sampling point from bulk truck or plant silo to individual farm
3-month mean (E.U.) used as single reference for period, which allows more time to reduce future SCC
Geometric mean (E.U.) mathematically lower than arithmetic mean (U.S.) and requires recalculation
NormanNMC – 2011 (7)
SCC noncompliance comparison
Current E.U. and U.S. SCC standards as well as 3 NMPF proposed standards
Percentage of herds
Percentage of milk supply
Examined by month, herd size, and state
NormanNMC – 2011 (8)
Data
SCS converted to SCC for 14,854 DHI herds
Herd requirements
15–26 tests (Jan. 2009 – Oct. 2010)
≥10 cows for all test days
Herd TD-SCC used as proxy for BT-SCC
Each cow SCC weighted by her TD milk yield
NormanNMC – 2011 (9)
SCC herd noncompliance – month
Jun 09
Jul 09
Aug 09
Sep 09
Oct 09
Nov 09
Dec 09
Jan 10
Feb 10
Mar 10
Apr 10
May 10
Jun 10
Jul 10
Aug 10
Sep 10
Oct 10
0
2
4
6
8
10
12
14
16
18
Current U.S. (750K)Proposed U.S. (600K)Proposed U.S. (500K)Proposed U.S. (400K)Current E.U. (400K)
Date
He
rd n
on
com
plia
nce
, %
NormanNMC – 2011 (10)
SCC milk noncompliance – month
Jun 09
Jul 09
Aug 09
Sep 09
Oct 09
Nov 09
Dec 09
Jan 10
Feb 10
Mar 10
Apr 10
May 10
Jun 10
Jul 10
Aug 10
Sep 10
Oct 10
0
2
4
6
8
Current U.S. (750K)Proposed U.S. (600K)Proposed U.S. (500K)Proposed U.S. (400K)Current E.U. (400K)
Date
Milk
no
nco
mp
lian
ce,
%
NormanNMC – 2011 (11)
SCC noncompliance – means*
NoncomplianceSCC standard Herd, % Milk, %750K, current U.S. 0.9 0.2
600K, proposed U.S. 2.7 0.7500K, proposed U.S. 6.2 2.0400K, proposed U.S. 14.1 5.8
400K, current E.U. 7.8 3.1
*November 2009 – October 2010
NormanNMC – 2011 (12)
SCC herd noncompliance – herd size
1–49 50–99 100–149 150–199 200–299 300–499 500–999 1,000+0
2
4
6
8
10
12
14
16
18
20
Current U.S. (750K)
Proposed U.S. (600K)
Proposed U.S. (500K)
Cows in herd
He
rd n
on
com
plia
nce
, %
NormanNMC – 2011 (13)
SCC herd compliance – state
Current U.S., 750K
Current E.U., 400K
Proposed U.S., 500K
Proposed U.S., 600K
Proposed U.S., 400K
<5%5–9.9%10–24.9%25–50%
NormanNMC – 2011 (14)
Conclusions
E.U. changes in SCC enforcement led to reconsideration of stricter U.S. standards
If 400K U.S. SCC limits were used, noncompliance would be higher than if current E.U. standard was applied
For U.S. producers to meet stricter SCC standards, sound management and culling for milk quality need to be emphasized