Animal Breeding
8 important questions on Animal Breeding
4 balanced breedings over time
- 80s - mainly milk production (INET) (100%)
- 1999 DPS: INET (58%) and Durability (42%)
- 2007 NVI: INET (40%) and Functional traits (60%)
- 2012 NVI: INET (27%) and Functional traits (73%)
What are 3 future breeding goal traits?
- feed efficiency
- metrage emission
- phosphorus efficiency
- Nitrogen efficiency
Health
- Disease resistance
- longevity
- Manufacturing
- nutritious value
Milk Composition - traits that are being recorded routinely
- Fat%
- Protein%
- Somatic Cell Count (SCC)
- Lactose%
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Detailed milk fat composition. How many are measured? How many are identified?
- > 100 fatty acids measured
- 45 fatty acids identified = >95%
- 13 fatty acids >1% w/w
What causes variation in milk fat composition?
(H^2 = het percentage dat verklaard wordt door genetic differences)
Korte zijn genetisch
Lage zijn environment
What kind of minerals are present in milk?
- Ca
- Se
- K
- Mg
- P
- Zn
What is the variation in minerals in milk per cow?
What causes variation in mineral composition?
oranje/ rest environment
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