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Flores, J., García, J.E., Mellado, J., Gaytán, L., de Santiago, Ángeles and Mellado, M. 2019. Effect of growth hormone on milk yield and reproductive performance of subfertile Holstein cows during extended lactations. Spanish Journal of Agricultural Research. 17, 1 (Apr. 2019), e0403. DOI:https://doi.org/10.5424/sjar/2019171-13842.