Timed artificial insemination plus heat II: gonadorelin injection in cows with low estrus expression scores increased pregnancy in progesterone/estradiol-based protocol 由 W.B. Rodrigues, A.S. Silva, J.C.B. Silva, N.A. Anache, K.C. Silva, C.J.T. Cardoso, W.R. Garcia, P. Sutovsky, E. Nogueira

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