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UBC Theses and Dissertations
Sources of variation affecting an alternate a.m./p.m. testing plan for dairy cows Dunn, Lorne Kendall
Abstract
The feasibility of an alternate A.M./P.M. sampling scheme for testing the milk, fat, protein and lactose production of dairy cows was investigated. It was found (Part I) that the contribution of testing, sampling and compositing variances to the variance of records based on alternate and 24 hour testing schemes did not differ significantly. In Part II, it was found that additive correction factors for estimating daily yields from a single A.M. or P.M. weight were sufficient correction for all yield variables over different seasons of calving, lactation numbers, stages of lactation and individuals, but that different factors were required for different milking intervals. In addition, it was found that lactation yield estimates could be calculated by extending the alternate single sample yields over the respective test intervals and summing the results, without any significant bias, for different intervals and for all yield variables.
Item Metadata
Title |
Sources of variation affecting an alternate a.m./p.m. testing plan for dairy cows
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1976
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Description |
The feasibility of an alternate A.M./P.M. sampling scheme for testing the milk, fat, protein and lactose production of dairy cows was investigated. It was found (Part I) that the contribution of testing, sampling and compositing variances to the variance of records based on alternate and 24 hour testing schemes did not differ significantly.
In Part II, it was found that additive correction factors for estimating daily yields from a single A.M. or P.M. weight were sufficient correction for all yield variables over different seasons of calving, lactation numbers, stages of lactation and individuals, but that different factors were required for different milking intervals.
In addition, it was found that lactation yield estimates could be calculated by extending the alternate single sample yields over the respective test intervals and summing the results, without any significant bias, for different intervals
and for all yield variables.
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Genre | |
Type | |
Language |
eng
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Date Available |
2010-02-11
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0093854
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.