TY  - RPRT
TI  - Evaluation models and genetic parameters for calving difficulty in beef cattle.
AU  - F Phocas
AU  - D Laloë
PY  - 2003
DO  - 10.2527/2003.814933x
UR  - https://pubmed.ncbi.nlm.nih.gov/12723082/
ID  - 12723082
ER  -