title: Effects of sodium sesquicarbonate on dry matter intake and production of milk and milk components by Holstein cows.
abstract: Forty-six multiparous Holstein cows were used to investigate the effects of sodium sesquicarbonate on dry matter intake, body weight, and production and composition of milk during a 308-d lactation. Diets contained alfalfa silage, corn silage, and concentrate. Composition of diets was changed twice during the 308-d lactation experiment. Diets fed during d 1 to 175 and d 176 to 245 were formulated to contain more rumen-undegradable protein and fat, and less forage than that fed during d 246 to 308. Sodium sesquicarbonate did not affect yields of milk, 4% fat-corrected milk, and components in milk, or percentages of components in milk during the complete 308-d lactation or during d 1 to 175 or d 176 to 245. However, from d 246 to 308, cows fed sodium sesquicarbonate produced more milk, 4% fat-corrected milk, fat, protein, and solids-not-fat than did control cows. Milk composition was not altered. These data suggest that composition of the diet has a significant effect on the response to dietary buffers by lactating dairy cows.
authors.affiliation: Department of Animal Sciences, University of Illinois, Urbana 61801, USA. jhclark@uiuc.edu
authors.forename: J H
authors.initials: JH
authors.lastname: Clark
authors.forename: R A
authors.initials: RA
authors.lastname: Christensen
authors.forename: H G
authors.initials: HG
authors.lastname: Bateman
authors.forename: K R
authors.initials: KR
authors.lastname: Cummings
mesh_terms: D000818:Animals; D001639:Bicarbonates / Q000008:administration & dosage*; D001824:Body Constitution / Q000502:physiology; D001835:Body Weight / Q000502:physiology; D002417:Cattle / Q000502:physiology*; D004032:Diet / Q000662:veterinary*; D019587:Dietary Supplements; D004435:Eating / Q000502:physiology*; D005223:Fats / Q000032:analysis; D005260:Female; D007774:Lactation / Q000502:physiology*; D016018:Least-Squares Analysis; D008892:Milk / Q000737:chemistry / Q000378:metabolism; D008894:Milk Proteins / Q000032:analysis
chemical_list: D001639:Bicarbonates; D005223:Fats; D008894:Milk Proteins; C029065:Magadi soda