Lopes, S. P.Garcia, F. Z.Cosma, F.Brito, M. F.Ubiali, D. G.Souza, Vinicius C.Costa, D. F. A.Malafaia, P.2023-04-262023-04-262022-11http://hdl.handle.net/10919/114800The aim of this case study was to evaluate the clinical and productive data of Nellore cows during pregnancy and lactation, supplemented or not with P. Ninety-five pregnant heifers were divided into two groups (G(40) and G(0)). Until the date of calving animals from G(40) received a mineral mixture composed of 224g of Na and 40g of P/kg, and G(0) received only NaCl. After calving heifers were divided into four treatments: from G(40), 28 first-calf cows continued to receive the mineral mixture containing 224g of Na and 40g of P/kg (group 40/40) and 12 started to receive only NaCl (group 40/0); from G(0), 26 continued to receive only NaCl (group 0/0) and 15 started to receive a mixture containing 224g of Na and 40g of P/kg (group 0/40). In the second experimental phase, 205 multiparous cows were divided into two groups: G(1) (40/40) consisting of 40 cows, receiving a mineral mixture containing 244g of Na and 40g/P per kg, during pregnancy and lactation, and group 2 (0/0) formed by 165 cows, which were supplemented only with NaCl. In both experiments, whether in pregnant or lactating breeders, there was not any sign of P deficiency or differences in calves LW at 120 and 210 days.application/pdfenCreative Commons Attribution 4.0 Internationalbeef cattleNellore breedersphosphorusArticle - Refereedhttps://doi.org/10.1590/1678-4162-126917461678-4162