Diagnosis: Salmonella Dublin

Now What?

This dairy has a number of group pens, calves are fed milk replacer with automatic computer controlled feeders. Recently they began having calves in the 7 to 10 day range show signs of diarrhea as well as elevated respiration rates and snotty noses.

Subsequent laboratory testing using tissue samples from a calf that died confirmed the presence of Salmonella dublin. The dairy and their veterinarian are working on a treatment protocol for the sick calves.

This case got me started on reviewing my file on this pathogen. I came across a short article written by Dr. Sheila McGuirk (retired from University of Wisconsin School of Veterinary Medicine) as a response to a reader question for Hoard's Dairyman.

I quote part of Dr. McGuirk's response below. It suggests how hard it is to control the spread of Salmonella dublin once it is present on a dairy. 

"S. dublin is unique amongst the other Salmonella bacteria in that it can infect cattle and establish a carrier state in some animals for life. Carrier cattle may not reveal themselves as being sick, but they shed infectious organisms in the environment and, very impactful for calf health, in colostrum and milk.

Along with feces, other bodily secretions of carrier animals discharge infectious organisms, making it very difficult to avoid the exposure of young calves to infection. Oral exposure to Salmonella organisms is common, but for calves that spend more than just a few minutes in a calving area, their skin, naval and feet can be a vehicle for bringing the organism to calf housing."  [emphasis added]

Hoard's Dairyman, September 25, 2014

So, now this dairy not only  has the issue of how to treat the calves that are already sick, there is the matter of establishing barriers to reduce the numbers of the organism being brought into the calf barn.

Winter Weather, Pneumonia in Calves?

In a brief article Dr. Russ Daly, extension veterinarian at South Dakota University, addresses:

• Why cold winter weather increases the risk of young calves having respiratory infections.
• Detection and prevention of pneumonia.
• Antibiotic treatments.
• Supportive care.

Click HERE to go to this article.

He includes two links to additional pneumonia-related articles,

• Minimizing Respiratory Disease in Young Dairy Calves in Calf Barns
• Dealing with Respiratory Disease in Young Dairy Calves. 

Enjoy. Keep warm and dry. 

Milk Yield per Milking for

Milkings 1-8 Post Calving

How much colostrum and transition milk should we expect from our cows? Another study measured these yields from 37 cows. The data are below as average yield.

   Milking No.        Kg          Lbs.   

1	7.5	16.5
2	4.9	10.7
3	7.2	15.9
4	11.4	25.1
5	10.7	23.5
6	13.1	28.9
7	11.1	24.3
8	14.2	31.2

The study colostrum feeding program for calves fed 10% of birth weight (40kg) required 6L or Kg per calf. Thus, on the average these yields (7.5 quarts) were enough to meet program needs where they fed calves colostrum from their own dams.

If the dairy chooses to feed 2nd, 3rd and 4th milkings (transition milk) to calves, on the average these dams produced nearly 52 pounds (23.5kg) over 36 hours. When I collected transition milk for my calves I found that I had enough volume to feed it exclusively to all my heifer calves for the first seven to ten days (I fed 4 quarts daily for most of the year and 5 quarts during January, February and March).

Reference: Dunn, A, and Others, "Effect of concentrate supplementation during the dry period on colostrum quality and effect of colostrum feeding regimen on passive transfer of immunity, calf health and performance." Journal of Dairy Science 100:357-370. Research was done in Ireland during the months of February, March and April, 2014.

Miner Institute Farm Report

If you are not already receiving this monthly Farm Report from the Miner Institute now is the time to sign up for it. Just send an e-mail to Rachael Dutil at this address dutil@whminer.com so she can add your name to the mailing list to receive a note each time a new issue is published. 

To see the current issue do this:

The URL is http://www.whminer.com/dairy.html or click HERE to go there. 

Click on the drop-down item "Dairy" and then click on "Farm Report"

The January issue topics are:

• Rethinking Fiber Dynamics and Grass Forages
• Calving: To Assist or Not to Assist
• A New Year's Resolution
• Corn Hybrid Silage Trial Results
• Use of Bulk Tank Milk Fatty Acid Data to Make Nutrition & Management Decisions
• Blurring the Lines: Dairy Beef
• Resolutions with Real Impact
• Edge-of-Field Phosphorus Losses
• What's Happening on the Farm
• Soybeans in the North Country: An Update

Yet More Evidence that Feeding More High Quality Colostrum Has Benefits for Calves

In an Irish study 37 calves averaging 40.4kg (90.5 lbs.) were allocated to two colostrum feeding treatments:

• 5% of body weight of colostrum (55g/L IgG) fed (2L or 2.1 qts) within 1 hour after birth followed by the same volume of second milking (est. 30g/L IgG) at 12 hours.

• 10% of body weight of colostrum (55g/L IgG)  fed (4L or 4.2 qts) within 1 hour after birth followd by 2L (2.1qts) of similar quality colostrum at 12 hours.

These feedings translate into:

• 5%-calves = 110g IgG first feeding, 60g IgG second feeding = total 170g

• 10%-calves = 220g IgG first feedng, 110g IgG second feeding = total 330g

What happens in the calves? When we compare circulating antibodies in their blood, the 10% calves had 48% more antibodies than 5% calves at 24 hours and 50% more antibodies than 5% calves at 48 hours. 

What happens later? When we compare diarrhea treatment rates, the 10% calves had a 43% treatment rate compared to 53% for 5% calves. Note that these were group housed with an automatic milk replacer feeder and the program had a low threshold for starting treatment.

For comparison, one of my Calf Wellness dairy clients feeds 4qts within one hour of birth, another 2 quarts at 6 hours and another 2 quarts at 12 hours. [All first-milking colostrum tested at greater than 50g/L.] Using blood serum total proteins as an estimate of immunity their results look like this:

Blood Serum Total Protein Values

Visit Date                                                       Dec16  Nov16 Oct16  Sep16  Jun16 Mar16

Number of reported values                             85        45        45        168      78        35       

Number of values at 4.5 or below                   0          0          0          2          0          0         

Number of values at 5.0 or below                   0          1          1          12        6          2         

Percent values 5.5 and greater                        91%     91%     98%     85%    92%     92%    

Average                                                           6.3       6.4       6.1       6.4       6.2       6.2      

Median                                                            6.2       6.4       6.0       6.4       6.1       6.1  

Bottom line is that feeding more IgG's results in more antibodies in the blood, period.  

  

What Level of Bacterial Contamination is "Normal" for Colostrum?

The January issue focus is on bacterial contamination in colostrum. 

The key points are:

• ·         Why do we care about bacterial contamination of colostrum?
• ·         So, what are realistic, cost-effective goals for bacterial contamination levels?
• ·         Are dairies feeding low bacteria count colostrum (less than 100,000cfu/ml)?
• ·         Should we accept failure as “Normal?”
• ·         How to make “Success” the new normal on a dairy.

       To access this issue click HERE or paste this URL in your browser

        http://www.atticacows.com/library/newsletters/CEJanuary2017.pdf

        Enjoy. 

More on Bacteria Counts in Colostrum

In my December 29, 2016 post I suggested that bacteria counts over 200,000 or 300,000 should not be considered "normal" for a commercial dairy.

I went back in my files to check on a 400 cow dairy in western New York State. We started working together in the fall of 2003 to improve colostrum management.

These are the culture results from the following February and June, 2004.

Table 1. Lab results reported on 6/17/04

Sample ID	Coliform bacteria (cfu/ml)	Total bacteria (cfu/ml)
Colostrum #1113 Kevin 3/3/04	None	15,600 (Strep. Species)
Colostrum #1317 4/17/04	None	1,900
Colostrum #1285 M 4/18/04	None	7,800 (Staph. Species)
Colostrum #1306 M 4/29.04	500	TNTC (Strep. Species)
Colostrum #1135 R 5/4/04	300	1,100
Colostrum #10 B 5/23/04	None	None

Table 2. Samples reported February, 2004

Sample ID	Coliform bacteria (cfu/ml)	Total bacteria (cfu/ml)
Colostrum #494 M 1//26	None	TNTC (Staph)
Colostrum #1033 T 1/30	None	800
Colostrum #1126 T 2/5	500	19,800 (some yeast)
Colostrum #701 frozen	None	1,500
Waste Milk	1,300	3,700
Colostrum #1167 M 2/5	200	1,300

The two cows with high bacteria counts were chronic mastitis animals that appear not to have cleared these infections during the dry periods. 

When they submitted samples  three years later in May 2007 the culture results look like this:

Sample ID	Coliform bacteria (cfu/ml)	Total bacteria (cfu/ml)
Colostrum #661 M	None	None
Colostrum #1293 B 4/14	None	400 (300 Staph species, 100 Strep species)
Colostrum #1546 M 4/11	None	1,000 (800 Staph species, 200 Strep species)
Colostrum #1555 D 2/15	None	None
Colostrum #1694 B 4/26	None	400 (200 Staph species, 200 Strep species)
Colostrum #1729 D 4/19	None	10,500 (10,200 Staph species, 300 Strep species)

When they submitted samples in March 2012 the culture results look like this:

Sample ID	Coliform bacteria (cfu/ml)	Total bacteria (cfu/ml)
#2269 N 1-26	None	900 (700 Staph species, 200 Strep species,)
#2112 M 1/25	None	900 (600 Staph species, 200 Strep species, 100 gram pos bacillus)
#2433 M 2/3	None	600 (200 Staph species, 100 Strep species, 300 gram pos bacillus)
#2217 B 1/28	None	3,000 (2,000 Staph species, 500 Strep species, 500 gram pos bacillus)
#1881 M 2/14	None	4,500 (3,000 Staph species, 1,000 Strep species, 500 gram pos bacillus)
#2452 N 2/22	None	500 (200 Staph species, 300 Strep species)
#2109 N 2/21	100	1,300 (800 Staph species, 400 Strep species, 100 coliforms)
#2449 B 2/5	None	1,200 (700 Staph species, 300 Strep species, 200 gram pos bacillus)

Can they sustain this level of colostrum management? Here are the Spring, 2016 culture results.

Sample ID	Coliform bacteria (cfu/ml)	Total bacteria (cfu/ml)
2948	7,500	32,500 (25,000 Strep species, 7,500 coliforms)
2655	None	None
3021	None	2,300 (1,500 Strep species, 500 Staph species, 300 gram pos bacillus)
3089	None	1,600 (800 Staph species,. 300 Strep species, 500 gram pos bacillus)
2803	None	300 Strep species
2587	None	300 (200 Strep species, 100 gram pos bacillus)
3053	100	1,300 (1,000 Staph species, 200 Strep species, 100 gram pos bacillus)
3115	None	4,400 (1,300 Staph species, 2,500 Strep species, 600 gram pos bacillus)

I conclude that low bacteria counts can be achieved - over 12  years on this dairy. Here and there a blip but overall results are good. 

What does it take to get here? Good protocols and strong "buy-in" by both the dairy owner and the herdsman. 

Do you have a good example to share? Let me know at smleadley@yahoo.com