Beef Cattle
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Parturition
Calving
Intact male
Bull
Castrated male
Steer
Female
Cow
Young male
Bull calf Bullock
Young female
Heifer
All young
Calves
Cattle ancestor
Great auroch
Man responsible for breed development and selective breeding
Robert Bakewell (father of animal breeding)
Breed development 3 steps
1) determine desired traits 2) selection of parents for next generation 3) evaluate offspring for selection
Purebred
define set of characteristics passed from parents to offspring Humans determine desired characteristics Genes for desired traits are more homozygous with less heterosis
How many recognized and unnamed breeds of cattle?
250 recognized breeds >300 unnamed varieties 
Difference between dairy and beef cattle interaction with environment
Dairy: Environment altered to fit animals Beef: match animal’s characteristics environment
3 types of beef cattle
1) European (Bos Taurus) 2) Continental (Bos Taurus) 3) Zebu (Bos indicus)
European
Bos Taurus Europe Moderate size meat characteristics Reproduction Maternal ability Ex Hereford, angus, shorthorn
Continental
Bos Taurus European Larger size Draft Meat characteristics Reproduction Maternal ability Ex. Charlois, Chianina, simmental
Zebu
Bos Indicus Milk Meat Draft Tropical/subtropical adaptations Ex. Brahman
Zebu tropical adaptations
Short, shiny, dense, flat hair More skin/surface area for cooling Parasite, insect, and disease resistance
Synthetic breeds
Breed created from crossing two other breeds Breed for favorable characteristics from two different breeds to fit environment Ex. Brangus, simbrah, beefalo
Where are most cattle in the U.S. located?
Central U.S.
European examples
Hereford Angus Shorthorn
Continental examples
Charlois Chianina Simmental
Zebu example
Brahman
Synthetics examples
Brangus Simbrah Beefalo