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The use of reduced levels of organic minerals in diets for transition dairy cows.

F. Rennó



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The use of reduced levels of organic minerals in diets for transition dairy cows.
G. Silva1, M. Dias1, N. Grigoletto1, T. Del Valle2, A. Nunes1, P. Curti1, P. Vittorazzi Junior1, T. Silva1, C. Takiya3, J. Pettigrew4, A. Koontz5, L. Costa e Silva5, F. Rennó*1. 1University of São Paulo Pirassununga, SP, Brazil, 2Unipampa Itaqui, RS, Brazil, 3Kansas State University Manhattan, KS, 4James Pettigrew Consulting Nicholasville, KY, 5Alltech Inc Nicholasville, KY.

The use of organic sources, especially trace minerals, can be important during the transition period for dairy cows. The objective of the study was to evaluate the effect of reduced levels of organic trace minerals on milk yield and composition, dry matter intake and trace mineral levels in plasma, colostrum and liver of transition dairy cows. Twenty-four Holstein cows were assigned to 12 blocks, according to the body condition score, parity, and milk yield from the last lactation, for the following treatments: 1) Control (CON), following the NRC (2001) guidelines for Se, Zn, Cu, Co, and Mn as inorganic form (sulfates) and 2) Proteinated minerals (PM) and Se yeast (PM) (Bioplex Co, Cu, Mn, Zn, and Sel-Plex, Alltech Inc., Nicholasville, KY), at 50% of the NRC (2001) recommendation for Zn, Cu, Co, and Mn; Se was included at the NRC (2001) recommendation for both treatments. Treatments were provided from 4 weeks before the expected calving date through 8 weeks of lactation. Milk production and composition and dry matter intake were evaluated weekly. The determination of micro minerals (Se, Zn, Cu, Co, and Mn) in plasma and liver were measured −30 d before calving, day of calving, and 56 d postpartum. Data were analyzed using the MIXED procedure of SAS (2001). The PM increased (P = 0.006) milk yield (27.7 vs 30.9kg/d), protein (P = 0.006) (0.890 vs. 0.976 kg/d) and lactose (P = 0.008) (1.33 vs. 1.46 kg/d). PM tended to decrease (P ≤ 0.075) the concentration of hepatic Cu (55, 7 vs. 48.3 mg/kg) and increased (P = 0.016) plasma Se concentration (105 vs 119 µg/L). Dry matter intake was higher (P = 0.044) for animals in the PM diet (18.8 vs. 21.1 kg/d). In colostrum, PM treatment increased (P = 0.019) Se concentration (48.5 vs. 71.3 µg/L). Therefore, the inclusion of proteinated trace minerals (Zn, Cu, Co, and Mn) at 50% of NRC recommendations increased dry matter intake, and consequent milk yield, protein, and lactose contents in the milk without affecting trace minerals levels in the liver.

Keywords: milk production, liver biopsy, mineral concentrations.