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Home » Authors » Ken Zanzalari

Articles by Ken Zanzalari

Prepartum DCAD: How low is too low?

Studies show fully acidogenic prepartum diets improve calcium metabolism, as indicated by blood and urine measures, leading to better health and productivity in peripartum dairy cows.
March 17, 2026
Ken Zanzalari

The decision to feed an acidogenic ration to late-pregnant dairy cows is a very easy one, as there is no better strategy to initiate the mechanisms of calcium metabolism to meet the sudden high demand for this critical mineral surrounding the time of calving.


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The difference among full-, partial- and no-DCAD diets

February 7, 2019
David Kirk and Ken Zanzalari
For many years, the expectations for high milk production along with excellent herd health and reproductive performance were considered at odds with each other. It was believed you should not and could not expect to achieve high milk yields without compromising herd health and reproductive performance.
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Five reasons to make understanding DCAD nutrition a priority

September 28, 2018
Ken Zanzalari
How cows are fed and managed through the transition period (generally accepted as the three weeks before and after calving) can determine how healthy, productive and profitable cows can be.
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Manage transition cow health with serum total calcium testing

October 17, 2014
Ken Zanzalari
Like all well-run businesses, the management team of a well-run dairy operation will know and understand the key parameters that make them successful. When it comes to cow performance, these may include early postpartum health events, peak milk yield, total lactation milk yield, somatic cell count (SCC) and reproductive performance, just to name a few. To effectively manage these items, they must be measured.
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1513pd zanzalari 1 full

Hypocalcemia: Forgotten problem and hidden economic risk

October 10, 2013
Ken Zanzalari
The transition from late pregnancy to lactation requires enormous physiological adaptations from the dairy cow. One of the most important changes that occurs involves the balance of calcium. Cows unable to maintain adequate blood-calcium concentrations are susceptible to higher rates of early postpartum metabolic disorders and produce less milk.
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