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EFFECTS OF PHOSPHORUS AND CALCIUM ON FEED INTAKE AND YIELD AND COMPOSITION OF MILK OF HOLSTEIN COWS

  • Morse, D. ;
  • Head, H.H. ;
  • Wilcox, C.J.
  • Received : 1993.07.06
  • Accepted : 1994.01.19
  • Published : 1994.06.01

Abstract

Three concentrations of P (0.33, 0.43 and 0.54%) and two concentrations of Ca (0.60 and 0.97%) in ration dry matter were evaluated for effects on dry matter intake and on milk yield and composition using 24 Holstein cows. Cows were arranged in a $3{\times}2$ factorial experiment as an incomplete randomized block design with three 28-day periods. Each cow consumed at least one ration with each concentration of Ca. Dry matter intake, yield of 3.5% Fat Corrected Milk, and milk composition were not affected by concentration of P, but milk yield was greater when lowest concentration of P was fed (22.8 vs. 22.1 kg/day; p<0.07). Cows fed rations containing 0.60% Ca had greater milk (22.7 vs. 21.9 kg/day; p<0.02) and 3.5% Fat Corrected Milk yields (p<0.03) and slightly greater protein content than when fed 0.97% Ca. Dietary Ca:P ratios between 1.1:1 and 2.9:1 had no effect on dry matter intake, milk yield, or composition. Concentrations of P in plasma were within the normal range for all rations. Because cows had high dry matter intake, mean daily intakes of both P and Ca were greater than required for their level of milk yield.

Keywords

Phosphorus;Calcium;Milk Yield;Milk Composition;Feed Intake;Dairy Cows

Cited by

  1. Feeding phosphorus (P) to cattle: A new basis for Nordic recommendations vol.54, pp.4, 2004, https://doi.org/10.1080/09064700510009243