Effect of a Low Chloride Diet on Lactating Holstein Cows

Open Access
Publisher Website
Google Scholar
Abstract
Primiparous lactating Holstein cows (20) were fed diets supplemented with 0.5% sodium chloride or 0.75% sodium bicarbonate. Those fed the latter diet conserved Cl- by reducing the Cl- concentration in urine, feces, and to a small but nonsignificant amount, in milk. The low Cl- diet did not affect consumption of feed dry matter and water or milk production and composition. There was no indication of pica or other aberrant taste behavior. One half of the cows in each diet group was given free choice salt block of trace elements. Those fed the low Cl- diet consumed more salt (337 vs. 149 g/cow per wk). When Cl- requirements are established and data on Cl- composition become more widely available, it will be possible to include Na and Cl- in diet formulations and omit salt. This will reduce the amount of salt needed as a Na or Cl- supplement.