Dairy Cow Quiz 10/21
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Genetic change via selection
Predict milk production of sire’s offspring Use of artificial insemination
Predict daughter’s performance performance off sires genetics
Sire summary
Ex. Milk 1805. What does that mean?
Daughter is expected to produce 1805 more lbs of milk per 305 day lactation cycle compared to breed average
Proportion of trait passed from parent to offspring
Heterability
What 2 things are used to predict the effect of a sire on a dairy herd.
Average production of breed Average production of the given herd
Which sperm is larger, heavier, and slower?
X
Which sperm is lighter, smaller, and faster?
Y
bST stands for?
Bovine somatotropin
What is another name for bST
Growth hormome
What does somatotropin do?
Stimulates somatic cells (body cells)
Does bST naturally occur in all species?
Yes
What 3 functions does bST have?
Regulate milk production Increase metabolic rate Increase lipolysis (fat breakdown)
Why is bST used?
It increases the nutrients available for dairy cow to use in milk production. Increases level of milk production
How does bST affect feed intake and milk production?
⬆️ feed intake 6-8% ⬆️ milk production 10-20%
What year did the use of bST use stop?
2017 Social pressure
3 Successes of dairy industry
Dairy Herd Improvement Association (record system) Limited traits selected Technology improvement (Artificial insemination and control environment to ⬆️ production)