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Macromineral element interrelationships and lactational performance: empirical models from a large data set

, : Macromineral element interrelationships and lactational performance: empirical models from a large data set. Journal of Dairy Science 77(10): 3096-3110

The objectives were to model empirical interrelationships among dietary macromineral elements and cation-anion difference influencing DMI, milk yield, 4% FCM yield. and milk composition of dairy cows. The database consisted of 1022 cow-period means collected from 326 midlactation cows in experiments with incomplete block designs. Dietary concentrations of elements ranged from below to above current recommendations, and cation-anion difference (Na + K - Cl) was from +5.8 to +61.2 meq/100 g of dietary DM. Interrelationships were detected for dietary concentrations of Na by K for DMI, 4% FCM yield, and milk fat percentage; Na by Ca for DMI, milk yield, and 4% FCM yield; K by Cl for DMI, 4% FCM yield, and milk protein percentage; K by Ca for 4% FCM yield, milk protein, and fat percentages; Na and P for DMI and milk protein percentage; and K by P for 4% FCM yield and milk fat percentage. Maximal DMI and milk yield were observed with .58% Na, .40% Mg, and +38 meq/100 g of dietary DM. Agreement was close for DMI and milk yield responses to dietary cation-anion difference from our database and independent data sets. The models developed are empirical, do not necessarily establish cause and effect, and should be evaluated prudently; however, they provide useful information to design future research.

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Accession: 002426570

PMID: 7836598

DOI: 10.3168/jds.S0022-0302(94)77252-0

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