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Effects of dietary 25-hydroxyvitamin D3 for prepartum dairy cows receiving acidogenic diet.

C. S. Cortinhas



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Effects of dietary 25-hydroxyvitamin D3 for prepartum dairy cows receiving acidogenic diet.
A. Silva1, C. S. Cortinhas*2, T. S. Acedo2, M. J. F. Morenz3, F. C. F. Lopes3, M. B. Arrigoni1, M. H. Ferreira4, T. L. Jaguaribe4. 1São Paulo State University Botucatu, SP, Brazil, 2DSM Nutritional Products São Paulo, SP, Brazil, 3Embrapa Dairy Cattle Juiz de Fora, MG, Brazil, 4Federal University of Juiz de Fora Juiz de Fora, MG, Brazil.

The aim with this study was to evaluate the effects of 25-hydroxyvitamin D3 or cholecalciferol supplementation on milk yield, milk composition and plasma concentration of minerals. Forty multiparous Holstein dairy cows were blocked by parity at 30 d of the expected day of calving to receive an acidogenic diet (365 g/kg of NDF and 146 g/kg of CP, DM basis; −108 mEq/kg) with the treatments mixed in the TMR: a) control, cholecalciferol (Rovimix D3 500, DSM Nutritional Products, Basel, Switzerland) at 2.500 UI/kg of DM; b) HyD: 25-OH-D3 at 0,3 mg / kg of DM (Rovimix HyD, DSM Nutritional Products, Basel, Switzerland). After calving, cows were fed with the same diet. Colostrum yield was evaluated at 6 h after calving. Cows were milked twice daily and the production recorded during the first 50 d of lactation. Milk samples were collected thrice weekly in 2 sequential milkings to determine the content of fat, protein, lactose and urea nitrogen in milk. Blood samples were collected from coccygeal vein on days −7, 0, 1, 2 and 21 relative to parturition for determination of total Ca (tCa), ionized Ca (iCa), and total P (tP); and on days −7, 0 and 21 for 25-hydroxyvitamin D3 analysis. Data were analyzed using the mixed procedure of SAS. Statistical significance was considered at P ≤ 0.05 and the trend at 0.05 < P ≤ 0.10. HyD supplementation increased milk yield (32.5 vs. 29.9 kg/day; P = 0.04), fat-corrected milk yield (33.0 vs. 30.0 kg/day; P = 0.03), energy-corrected milk (32.4 vs. 29.5 kg/day; P = 0.03), and protein yield (0.97 vs. 0.889 kg/day; P = 0.04) compared with control group. Also, HyD tended to increase fat yield (1.17 vs. 1.05 kg/day; P = 0.06), colostrum yield (7.40 vs 5.63 kg; P = 0.07), and DM intake on prepartum (11.73 vs. 10.70 kg/d; P = 0.08). There was no difference (P > 0.10) for DM intake postpartum, and concentrations of fat, protein, lactose and urea nitrogen. In addition, HyD increased plasma concentration of 25-hydroxyvitamin D3, but no effect was observed on iCa, tCa, tP (P > 0.10). The HyD supplementation on prepartum dairy cows increase milk yield and improve composition in early lactation.

Keywords: 25-hydroxyvitamin D3, cholecalciferol.