Individualized Report, Example

Calf Data
Colostrum
IgG
(g/L)

Brix
(%)

IgG
(g/L)

Total
Protein
(g/L)

53.1

20.2

13.5

5.2

8.4

Birth
weight
(lbs.)
78

Brix
(%)

Weaning
weight
(lbs.)
NC

Average
Daily Gain
(lb/day)
NC

Number
of
Disease
Events
1 (d)

Fecal
Results*
Giardia

Calf ID
2612

Date of
Birth
5/31/2014

2613

5/31/2014

56.3

19.8

24.8

6.5

10.0

84

159

1.3

1

Crypto

2614

6/2/2014

77.4

23.3

17.3

5.8

9.0

91

125

0.6

1

Crypto

2618

6/3/2014

77.4

23.3

17.3

5.8

9.0

84

136

0.9

1

Crypto

2619

6/3/2014

57.3

21.2

14.0

5.4

8.5

98

200

1.9

1

Negative

2620

6/3/2014

71.6

23.7

19.9

5.9

9.2

106

186

1.4

1

Crypto

2621

6/4/2014

66.8

22.8

16.1

5.8

9.1

98

186

1.6

0

Crypto

2622

6/5/2014

45.7

16.8

10.5

5.3

8.4

115

232

2.2

2

Crypto

63.2

21

16.7

5.7

8.9

94

175

1.4

1.0

Excellent

>50

>22

>15

>5.5

>8.3

>1.8

0

Negative

Fair

4050

20-22

10-15

NA

7.68.3

1.4-1.8

>0

Negative

≤40

<20

<7.6

<1.4

Herd
Average

Standards

Serum

Poor

<10

≤5.5

Individualized Antibiotic Stewardship Report
Farm XXXXXXX

* Crypto=Cryptosporidium

>0

Feeding: http://alturl.com/st53n
Monitoring growth: http://alturl.com/r7jmz

If you have any questions, concerns, or comments regarding this
customized report, please contact Dr. Jason Lombard at (970)
494-7245 or at Jason.E.Lombard@usda.gov

Fall 2025

Negative

NC = Not Collected

For more information:
•
•

NAHMS Sheep 2024EXAMPLE

Customized Report on the Status of
Your Antibiotic Use

Colostrum--From Bottle to Blood
Colostrum, or first milk, provides essential nutrients and passive immunity to calves through antibodies, primarily
immunoglobulin G (IgG). Since calves are born without antibodies, colostrum is critical to their ability to develop
resistance to infections in first few weeks of life. Excellent quality colostrum contains at least 50 g/L of IgG, which
equates to a colostral Brix measurement of 22 percent. A Brix test is a relatively easy way to assess colostrum
quality. Sanitary collection and storage of colostrum minimize bacterial contamination, and pasteurizing colostrum
also reduces colostrum contamination.

Calf Growth and Disease
The graph below shows the weekly weights of all your calves enrolled during the latest quarter. Calves should
grow at an increasing rate throughout the preweaning period. Decreased growth rates may be caused by
inadequate nutrition and/or disease. Calves should receive an appropriate amount of milk per day based on their
weight and breed in accordance with guidelines published in the National Research Council (NRC) Nutrient
Requirements of Dairy Cattle. In addition, calves should have continual access to water and starter grain
beginning at 1 to 2 days of age. Feeding hay is not recommended for preweaned calves.

Protective antibodies (such as IgG) in colostrum are absorbed across the gut into the blood stream, resulting in
passive transfer. Measuring the amount of IgG in serum provides information about the calves’ immune status.
Excellent serum IgG is 15 g/L, which is associated with a serum total protein of 5.5 g/L. Serum total protein is a
relatively easy way to assess passive transfer on-farm. To ensure adequate passive transfer, feed calves at least
6 to 8 quarts of high quality colostrum, ideally within the first 6 hours of life.
The graph below show the results of colostrum and serum IgG testing.

The graph below shows average daily gain (ADG) and disease events for each calf. An excellent average daily
gain is greater than 1.8 lb/day ("Goal" line below). Calves with an increased number of disease events may have
lower ADG due to various factors, including decreased feed intake. To enhance ADG, it is essential to provide
excellent quality colostrum, ensure passive transfer, and keep calves healthy.