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Tom Jenkins Animal & Veterinary Sciences What is the Cause of Milk Fat Depression in Layman’s Terms? The Fatty Acid Forum sponsored by

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Page 1: What is the Cause of Milk Fat Depression in Layman’s Terms?Dr. Tom Jenkins, Clemson University CLA MFI The three CLA produced in the rumen that are milk fat inhibitors and cause

Tom Jenkins Animal & Veterinary Sciences

What is the Cause of Milk Fat Depression in Layman’s Terms?

The Fatty Acid Forum sponsored by

Page 2: What is the Cause of Milk Fat Depression in Layman’s Terms?Dr. Tom Jenkins, Clemson University CLA MFI The three CLA produced in the rumen that are milk fat inhibitors and cause

What is the Cause of Milk Fat Depression in Layman’s Terms? Dr. Tom Jenkins, Clemson University

High Forage High Grain P <

Milk Fat, % 3.36 2.49 0.01

Rumen Ac/Pr 3.08 1.67 0.01

From Griinari et al. 1998. J. Dairy Sci. 81:1251.

Page 3: What is the Cause of Milk Fat Depression in Layman’s Terms?Dr. Tom Jenkins, Clemson University CLA MFI The three CLA produced in the rumen that are milk fat inhibitors and cause

What is the Cause of Milk Fat Depression in Layman’s Terms? Dr. Tom Jenkins, Clemson University

50% 50%

From Diet Fat Made by Mammary Gland

Page 4: What is the Cause of Milk Fat Depression in Layman’s Terms?Dr. Tom Jenkins, Clemson University CLA MFI The three CLA produced in the rumen that are milk fat inhibitors and cause

0

5

10

15

20

25

30

35

Forage Grain

Acetate

Propionate

What is the Cause of Milk Fat Depression in Layman’s Terms? Dr. Tom Jenkins, Clemson University

Page 5: What is the Cause of Milk Fat Depression in Layman’s Terms?Dr. Tom Jenkins, Clemson University CLA MFI The three CLA produced in the rumen that are milk fat inhibitors and cause

What is the Cause of Milk Fat Depression in Layman’s Terms? Dr. Tom Jenkins, Clemson University

0.00

0.50

1.00

1.50

2.00

2.50

Forage Grain

Ratio

Page 6: What is the Cause of Milk Fat Depression in Layman’s Terms?Dr. Tom Jenkins, Clemson University CLA MFI The three CLA produced in the rumen that are milk fat inhibitors and cause

Caused by Changes in Dietary Lipid as it Passes Through the Rumen?

What is the Cause of Milk Fat Depression in Layman’s Terms? Dr. Tom Jenkins, Clemson University

Page 7: What is the Cause of Milk Fat Depression in Layman’s Terms?Dr. Tom Jenkins, Clemson University CLA MFI The three CLA produced in the rumen that are milk fat inhibitors and cause

What is the Cause of Milk Fat Depression in Layman’s Terms? Dr. Tom Jenkins, Clemson University

MAINLY UNSATURATED

IN FEED

MAINLY SATURATED

IN INTESTINES BIOHYDROGENATION

Page 8: What is the Cause of Milk Fat Depression in Layman’s Terms?Dr. Tom Jenkins, Clemson University CLA MFI The three CLA produced in the rumen that are milk fat inhibitors and cause

What is the Cause of Milk Fat Depression in Layman’s Terms? Dr. Tom Jenkins, Clemson University

Page 9: What is the Cause of Milk Fat Depression in Layman’s Terms?Dr. Tom Jenkins, Clemson University CLA MFI The three CLA produced in the rumen that are milk fat inhibitors and cause

What is the Cause of Milk Fat Depression in Layman’s Terms? Dr. Tom Jenkins, Clemson University

UNSATURATED

CLA TRANS FA

SATURATED

Page 10: What is the Cause of Milk Fat Depression in Layman’s Terms?Dr. Tom Jenkins, Clemson University CLA MFI The three CLA produced in the rumen that are milk fat inhibitors and cause

What is the Cause of Milk Fat Depression in Layman’s Terms? Dr. Tom Jenkins, Clemson University

UNSATURATED

CLA J TRANS 11 FAT

SATURATED

Page 11: What is the Cause of Milk Fat Depression in Layman’s Terms?Dr. Tom Jenkins, Clemson University CLA MFI The three CLA produced in the rumen that are milk fat inhibitors and cause

What is the Cause of Milk Fat Depression in Layman’s Terms? Dr. Tom Jenkins, Clemson University

UNSATURATED

CLA L

CLA J

TRANS 10 FAT

TRANS 11 FAT

SATURATED

MILK FAT DEPRESSION

Page 12: What is the Cause of Milk Fat Depression in Layman’s Terms?Dr. Tom Jenkins, Clemson University CLA MFI The three CLA produced in the rumen that are milk fat inhibitors and cause

What is the Cause of Milk Fat Depression in Layman’s Terms? Dr. Tom Jenkins, Clemson University

Feed C16 and C18 Sat\Unsat (n=10)

Rumen Input of Fatty Acids in Cows

Page 13: What is the Cause of Milk Fat Depression in Layman’s Terms?Dr. Tom Jenkins, Clemson University CLA MFI The three CLA produced in the rumen that are milk fat inhibitors and cause

What is the Cause of Milk Fat Depression in Layman’s Terms? Dr. Tom Jenkins, Clemson University

Feed C16 and C18 Sat\Unsat (n=10) Microbial Trans FA (n=5) Microbial CLA (n=7) Microbial Other (n=28)

Rumen Output of Fatty Acids in Cows CLAMFI (n=3)

Page 14: What is the Cause of Milk Fat Depression in Layman’s Terms?Dr. Tom Jenkins, Clemson University CLA MFI The three CLA produced in the rumen that are milk fat inhibitors and cause

CLA Bioactive lipids made by

microorganisms in the rumen from unsaturated fatty acids in

the feed.

What is the Cause of Milk Fat Depression in Layman’s Terms? Dr. Tom Jenkins, Clemson University

CLAMFI The three CLA produced in the

rumen that are milk fat inhibitors and cause milk fat

depression.

Page 15: What is the Cause of Milk Fat Depression in Layman’s Terms?Dr. Tom Jenkins, Clemson University CLA MFI The three CLA produced in the rumen that are milk fat inhibitors and cause

CLA Isomers Tested in the Dairy Cow • trans-8, cis-10 CLA • cis-9, trans-11 CLA • trans-9, trans-11 CLA • trans-9, cis-11 CLA (Perfield et al. 2007) • trans-10, cis-12 CLA (Baumgard et al. 2000) • cis-10, trans-12 CLA (Saebo et al. 2005) • trans-10, trans-12 CLA • cis-11, trans-13 CLA

What is the Cause of Milk Fat Depression in Layman’s Terms? Dr. Tom Jenkins, Clemson University

Page 16: What is the Cause of Milk Fat Depression in Layman’s Terms?Dr. Tom Jenkins, Clemson University CLA MFI The three CLA produced in the rumen that are milk fat inhibitors and cause

Points to Remember • CLAMFI overproduction in the rumen leads to MFD. • Excessive grain causes MFD by overproducing CLAMFI

not by inadequate acetate production in the rumen. • CLAMFI are synthesized when microorganisms in the

rumen convert unsaturated fat consumed to saturated fat. • The rumen production of CLAMFI can be controlled by

diet.

What is the Cause of Milk Fat Depression in Layman’s Terms? Dr. Tom Jenkins, Clemson University

Page 17: What is the Cause of Milk Fat Depression in Layman’s Terms?Dr. Tom Jenkins, Clemson University CLA MFI The three CLA produced in the rumen that are milk fat inhibitors and cause

The Fatty Acid Forum sponsored by


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