Restle, João, and Celso Grassi. “Spaying Cull Cows and tt’s Effect on the Weight Gain of the Cow and Calf”. Pesquisa Agropecuaria Brasileira 28, no. 12 (December 1, 1993): 1437–1441. Accessed June 1, 2026. https://apct.sede.embrapa.br/pab/article/view/4017.