http://www.omafra.gov.on.ca/english/livestock/beef/facts/06-015.htmhttp://agriculture.vic.gov.au/agriculture/dairy/feeding-and-nutrition/heifer-nutrition
https://futurebeef.com.au/knowledge-centre/nutrition/nutrient-requirements/
http://www.merckvetmanual.com/mvm/musculoskeletal_system/dystrophies_associated_with_calcium_phosphorus_and_vitamin_d/rickets.html
http://www.dairyaustralia.com.au/Animal-management/Animal-health/Animal-health-fast-facts/Downer-cows/Milk-fever.aspx
https://www.uaex.edu/publications/PDF/FSA-3071.pdf
http://beefmagazine.com/health/how-minimize-and-treat-waterbelly-cattle
http://www.omafra.gov.on.ca/english/livestock/beef/facts/06-015.htm
http://calfology.com/library/wiki/cryptorchidism
http://beef.unl.edu/learning/estrous.shtml
www.hereford.org/seedstock/gestation-chart
https://futurebeef.com.au/knowledge-centre/nutrition/nutrient-requirements/
http://www.merckvetmanual.com/mvm/musculoskeletal_system/dystrophies_associated_with_calcium_phosphorus_and_vitamin_d/rickets.html
http://www.dairyaustralia.com.au/Animal-management/Animal-health/Animal-health-fast-facts/Downer-cows/Milk-fever.aspx
https://www.uaex.edu/publications/PDF/FSA-3071.pdf
http://beefmagazine.com/health/how-minimize-and-treat-waterbelly-cattle
http://www.omafra.gov.on.ca/english/livestock/beef/facts/06-015.htm
http://calfology.com/library/wiki/cryptorchidism
http://beef.unl.edu/learning/estrous.shtml
www.hereford.org/seedstock/gestation-chart