1. (US) National Animal Health Monitoring System(2010).Dairy 2007: Heifer Calf Health and Management Practices on US Dairy Operations 2007.Fort Collins (CO):US Department of Agriculture Animal and Plant Health Inspection Service Veterinary Services Center for Epidemiology and Animal Health.Report No. 550.0110.
2. External signs of preparation for calving and course of parturition in Swedish dairy cattle breeds;Berglund B.;Animal Reproduction Science,1987
3. Maternal behavior of beef cows at parturition;Buddenberg B.J.;Journal of Animal Science,1986
4. The water Buffalo,
Bubalus Bubalis
, in Australia: reproductive and parent‐offspring behaviour;DG T.;Wildlife Research,1979
5. The behaviour of dairy cows and their newborn calves in individual or group housing