SRIVASTAVA, S K; SAHNI, K L; TIWARI, C B. Effect of oestrus detection frequency on pregnancy in Holstein Friesian and crossbred cows. The Indian Journal of Animal Sciences, Delhi, India, v. 75, n. 9, 2005. Disponível em: https://epubs.icar.org.in/index.php/IJAnS/article/view/9425. Acesso em: 23 oct. 2025.