CATTLE RAISERS COMMUNITY
Planned in-fi eld use studies Merck also maintains its commitment to sound sci-
ence; a cornerstone of the Five-Step Plan. The signifi cant advances noted have enabled the company to move for- ward with the next step — the in-fi eld use studies — for which it will seek the participation of industry partners. Given the addition of Component Feeding to the label, the planned In-Field Use Study design and protocols will be reviewed before the studies commence. These studies will be overseen by an independent third-party and will extend into the high heat months. The guiding principles of the studies remain the same. • Observing cattle throughout the system — before and after receiving Zilmax — at the feedyard and at the packing plant;
• Evaluating the mobility of cattle by trained third- party experts utilizing an established mobility scoring system; and
• Reviewing potential confounding factors such as nutrition, transportation, receiving facilities, fl ooring surfaces, and cattle management and handling practices, given that mobility issues can be the result of numerous issues or even multifactorial in nature.
For the duration of the Planned In-Field Use Studies,
Zilmax will be made available only to cattle feeders who can meet and maintain all conditions of the best management practices initiative and the certifi cation program, as well as fully comply with all protocols of the In-Field Use Studies. We believe the results of the in-fi eld use studies will help support the return of Zilmax to the market place in the future.
Additional label modifi cations In addition to Component Feeding, the FDA has
approved a revision to the existing Complete Feed indication in the label. The current Complete Feed label dose for zilpaterol is 6.8 grams/ton to provide 60 to 90 mg/head/day. The label will now include an updated caution statement that notes cattle should not be fed Zilmax in excess of 90 mg/head/day. If pen consumption of complete feed exceeds 26.5
pounds/head/day (90 percent on a dry matter basis), zilpaterol should not be fed in complete feed. This ad- ditional language will further ensure that Zilmax use remains compliant with the label regardless of the delivery feed method chosen.
20 The Cattleman January 2015
thecattlemanmagazine.com
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