1
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2
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- Response to genetic selection has been well documented on a population
basis
- Dairy producers are more likely to appreciate its value if it is
demonstrated in their own herd
- Prediction on an individual herd level should be a useful extension tool
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3
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- First lactation cows calving from 2005-2008
- Required to have both sire and dam PTAs
- Matched cow’s phenotypic record with sire and dam PTA from evaluation
prior to cow’s first calving
- Herds with a minimum of 50 cows meeting above criteria
- 7,697 Holstein herds; 412 Jersey herds
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4
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- Phenotypic trait=
- Parent Average of same trait
- + cow’s calving yr
- + Error
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5
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- 1st lactation ME Milk
- 1st lactation ME Fat
- 1st lactation ME Protein
- 1st lactation ME SCS
- Days open (using PTA DPR * -4)
- Productive life (PL)
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6
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- Trait Mean and SD of b
- 1st lactation ME Milk 1.01 ± 0.45
- 1st lactation ME Fat 0.90 ± 0.44
- 1st lactation ME Protein 0.81 ± 0.43
- 1st lactation ME SCS 0.88 ± 0.60
- 1st lactation Days open 1.03 ± 1.10
- Productive Life 0.71 ± 0.69
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7
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- Trait Mean and SD of b
- 1st lactation ME Milk 1.02 ± 0.42
- 1st lactation ME Fat 0.91 ± 0.39
- 1st lactation ME Protein 0.91 ± 0.43
- 1st lactation ME SCS 0.86 ± 0.69
- 1st lactation Days open 1.03 ± 1.12
- Productive Life 0.69 ± 0.80
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8
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9
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10
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- Too few records to show an accurate picture
- Different management level
- Misidentification
- Predicting 1st lactation phenotypes, based on PA calculated
from lactations 1-5
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11
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12
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13
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14
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15
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16
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17
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18
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19
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20
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