Jul 25, 2014
Home| Tools| Events| Blogs| Discussions| Sign UpLogin


March 2013 Archive for Dairy Today Healthline

RSS By: Dairy Today: Healthline, Dairy Today

Dairy Today Healthline

Don’t Guess at Corn Silage Nutrient Composition

Mar 22, 2013

Follow these three steps for success.

Elliot Block RGBBy Dr. Elliot Block, Senior Manager, Technology, Arm & Hammer Animal Nutrition

The easy way to accomplish sound ration formulation with any cropping conditions, but especially when crops are suspected to be variable, is to use the phenomenal modeling programs and lab analytical capabilities that are at your disposal.

Follow these three steps for success:

1. Know which model your ration balancing platform uses.

The major platforms use either CNCPS 5.0 (CPM Dairy), CNCPS 6.1 (AMTS and NDS) or NRC 2001. If you use other platforms, determine which model your platform most closely emulates.

2. Completely analyze forages for the components used in your nutritional model.

Simply knowing the starch value is insufficient, particularly this year. It is just as important to get the correct value for the fermentability of that starch. Corn Silage NDF values alone are not sufficient either. Use the values for rate and extent of NDF digestibility to get the diet closer to correctly predicting animal performance.

• In this regard, NDF is not always NDF and the type of NDF analysis that is best suited for your ration formulation model will differ (see below). Every forage lab conducts the analyses requested and has different forms and formats for requesting the analytical procedures. Make certain to ask for the correct analyses best suited to your ration formulation model.

In addition to the standard nutrient analyses, obtain results for these analyses:
• aNDF: NDF done with the use of Na Sulfite which solubilizes most, but not all, of the protein out of the NDF residue. It is used in the CNCPS 6.1 and NRC 2001 models.
• aNDIP: This is the crude protein measured on the aNDF residue and is used in CNCPS 6.1 and NRC 2001 models.
• NDR: This is the NDF analysis performed without Na Sulfite and is used in the CNCPS 5.0/CPM model.
• NDRIP: This is the protein done on the NDR residue and is used in the CNCPS 5.0/CPM model.

Determine which NDF digestibility assays will be most critical.

• The models currently support the measurement of NDFd at 24 and 30 hours.
• Next year the industry will move to a two-pool model as suggested in the 2009 Cornell Nutrition Conference proceedings. This will mean 30, 96 or 120 and 240 in vitro digestibilities. The 240-hour uNDF will replace the need to do lignin testing and will better recognize the indigestible fiber, which is variable within plant species as well as among plant species. This will allow us to better fine-tune rations for the amount of forage that can be fed—but that is for next year.

Know starch fermentability.
• Ask for a 7-hour starch digestibility. This is a starting point and allows nutritionists to develop Kds (rate of digestion). Researchers are working with the various forage labs to develop a more robust multi point measurement that will increase the robustness of the predicted single-pool Kd.
• It is important that field nutritionists truly understand what to request in an analysis based on ration balancing tools used. For example, if CPM is used, ask for NDR and NDRIP. If 6.1 is used, ask for aNDF and aNDIP.

Lastly, don’t forget, stressed crops may contain more mycotoxins; therefore a mycotoxin analysis is essential as you work with silage.

3. Enter the data obtained from the above into the nutrient profile of the feed.

At this point you can reoptimize the ration and come much closer to accurately knowing how the cow will perform and which ingredients may have to be changed.

By using these available tools, you can avoid weeks or months of subpar performance or nutritionally induced health issues because you decided to use "typical values" for these parameters.

NIR (Near Infra-Red) CAUTION NOTE: Some of the forage analytical labs have robust equations to give reliable estimates of digestibilities by NIR but other labs do not. While NIR will result in accurate estimates for major nutrients (except minerals) in forages, if the forage you work with is not "mainstream," consider requesting wet chemistry for digestibilities and fermentabilities.

Contact Dt. Block at Elliot.block@churchdwight.com; or visit Arm & Hammer's dairy website.

MLV and Killed Vaccines Both Have a Home on the Dairy

Mar 10, 2013

Understanding the differences between killed and modified-live vaccines can provide better protection from disease.

Brian Miller Photo   2Dr. Brian Miller, Professional Services Veterinarian, Boehringer Ingelheim Vetmedica, Inc.

Vaccination plays an integral role in keeping dairy herds healthy and productive, but despite having such a fundamental role, the function of the vaccines we choose is quite complex.

Understanding the differences between modified-live virus (MLV) vaccines and killed vaccines allows veterinarians and producers to use them properly and at appropriate times.

Let’s look at the definitions of these two categories. A modified-live vaccine contains a small quantity of bacteria or virus that has been altered, so that it is no longer capable of causing clinical disease, but is still capable of mimicking natural infection by replicating within the animal, creating an immune response and subsequent immunity. A killed vaccine, however, has been altered so the virus or bacteria is dead and cannot replicate. Typically, killed vaccines contain large amounts of antigen and utilize adjuvant(s) to enhance the immune response.

Both modified-live and killed vaccines have a place on the dairy, and their function can be summed up in two words: robustness combined with safety when used on label, and safety respectively. A simplified description, perhaps, but these two words carry heavy meaning for vaccines.

For example, a modified-live vaccine generally provides a more robust, long-lasting response, because the animal "sees" all the different stages of the replicating (multiplying) virus or bacteria. Modified-live vaccines like Express® FP 10 are commonly used in a dairy herd because they provide greater and longer-lasting immunity.

A common concern when using modified-live vaccines is safety. EXPRESS FP 10, when used according to label directions, is safe to use in pregnant cows provided they were vaccinated, according to label directions, with any EXPRESS FP vaccine within the past 12 months. If you choose not to use a modified-live vaccine during pregnancy, a killed vaccine is an alternative choice. Consult with your veterinarian regarding this decision.

With killed vaccines like Triangle®, we typically think of safety. Modified-live vaccines should not be used in pregnant animals with an unknown vaccination history. When dealing with this type of situation, killed vaccine products are a safer choice.

Disadvantages of killed versus modified-live vaccines include a slower onset of immunity, shorter duration of immunity, the need for multiple doses to stimulate initial immunity, and unresolved issues regarding the robustness of the immune response following their use.

There are regional differences when it comes to vaccine usage but many dairies use a core vaccine protocol that includes a 10-way (five-way viral and five-way Lepto) and a seven- or eight-way clostridial. While these two vaccines often serve as the foundation of a vaccine protocol, additional vaccines used might include protection against respiratory bacteria, Salmonella or pink eye.

To develop the most effective vaccine protocol utilizing both modified-live and killed vaccine products, work closely with your herd veterinarian. Take compliance seriously, and remember to always follow label directions to optimize immunity in each animal, and provide greater overall immunity and protection for your dairy herd.

Regardless of MLV or killed vaccination preferences, Boehringer Ingelheim Vetmedica, Inc has the broad vaccine portfolio with proven protection to satisfy the needs that are most important to you and the success of your herd.

For more information, visit www.bi-vetmedica.com/cattle.

Express and Triangle are registered trademarks of Boehringer Ingelheim Vetmedica, Inc. ©2013 Boehringer Ingelheim Vetmedica, Inc.

Log In or Sign Up to comment

COMMENTS

Receive the latest news, information and commentary customized for you. Sign up to receive Dairy Today's eUpdate today!

 
 
 
The Home Page of Agriculture
© 2014 Farm Journal, Inc. All Rights Reserved|Web site design and development by AmericanEagle.com|Site Map|Privacy Policy|Terms & Conditions