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Impact of participation in somatic cell count testing on herd average somatic cell score. National Mastitis Screening. 93% of cows on DHI test plans participate in mastitis screening. 3.8 million cows. 25,000 herds. 20% less herds than in 2000, although number of cows unchanged.

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Presentation Transcript
national mastitis screening
National Mastitis Screening
  • 93% of cows on DHI test plans participate in mastitis screening.
    • 3.8 million cows.
    • 25,000 herds.
    • 20% less herds than in 2000, although number of cows unchanged.
  • Herd average somatic cell count (SCC) has increased since 1995, but was slightly lower in the last 2 years.
objectives
Objectives
  • Evaluate the effectiveness of mastitis screening in reducing herd average somatic cell score (SCS).
  • Investigate seasonal and regional differences in herd average SCS.
slide4
Data
  • Base herds selected
    • Started SCC testing after July 1995
    • Milked 2x for the first 30 months of testing
  • Herd Test day records screened
    • Dropped after >6 mo of no test
    • Included 10 cows with SCC records and 50% of cows in milk
  • Herds screened
    • >1 month of testing
    • 1st month on test met test day record screening
slide5
Data
  • 51,589 test days in 2950 herds
  • Included on herd test day records
    • Test date
    • Time herd on testing (mo)
    • Region
  • Calculated from cow test day records
    • Mean milk/cow
    • Mean SCS/cow (weighted by milk)
regions
Regions

Northwest

Northeast

Midwest

68

1492

1089

Southwest

79

222

Southeast

initiation of scc testing by region
Initiation of SCC Testing by Region

800

Northeast

700

Midwest

Southeast

600

Northwest

500

Southwest

Herds

400

300

200

100

0

1995

1996

1997

1998

1999

2000

2001

2002

2003

2004

July -

-June

Year of First SCC Test

methods
Methods

Model:

SCSHerd TD = Herd + Season + Test month + Time on test

Where:

Season = calendar month

Test month = months since June 1995

Time on test = months since herd’s first SCC test

regional herd scs

Northeast

Midwest

Southeast

Regional Herd SCS
mastitis based culling decisions
Mastitis Based Culling Decisions

2100 Herds with cows coded “culled for mastitis”

mastitis based culling decisions13
Mastitis Based Culling Decisions

Northeast (841)

Midwest (1011)

Southeast (151)

Northwest (39)

Southwest (58)

seasonal effects by region

Northeast

Midwest

Southeast

Northwest

Southwest

Seasonal Effects by Region

0.30

0.25

0.20

0.15

0.10

Herd SCS Effect

0.05

0

-0.05

-0.10

-0.15

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Month

summary
Summary
  • Participation in mastitis screening may be helpful in reducing bulk tank SCC.
  • SCS is seasonally affected.
  • Culling for mastitis increased slightly during the first months on SCC testing.
related areas of interest
Related Areas of Interest
  • Effect of changes in milking frequency on herd SCS
  • Effect of herd size and changes in herd size on herd SCS
  • Impact of individual cows (culling) vs. herd-wide effects on herd SCS