| Differential smoothing of time-series measurements to identify disturbances in performance and quantify animal response characteristics: an example using milk yield profiles in dairy cows. | |
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MedLine Citation:
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PMID: 21478456 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Recent advances in on-farm technology now provide us with multiple time-series of reliably measured indicators of animal performance and status at the level of the individual. This paper presents a smoothing approach for extracting biologically meaningful features from such time series using bovine milk yield data as an example. The main goal of this study was to illustrate how the method can be used to detect production deviations, extract quantifiable features of the deviation profiles, and thus provide means to examine hypotheses concerning the nature of the deviations. The effectiveness of the method was assessed with complete lactation curves from 47 Holstein cows. Within their lactations, the cows were each subjected to 1 nutritional challenge for a period of 4 d (their standard diet: a maize silage-based total mixed ration was diluted with 60% wheat straw), which provoked a decline in the milk yield in all cows. The challenge was imposed between the same calendar days for all cows. Thus, the cows were at different stages of lactation: early (n = 14), mid (n = 15), and late (n = 18). Each milk-yield curve was decomposed into components that: i) capture the cow's short-term deviations like the response to the nutritional challenge, and ii) describe the phenotypic potential yield function of that cow throughout its lactation. The difference between the 2 components gives a measure of the "milk loss". In all, 480 deviations were detected from the complete lactations of 47 cows. The milk loss provoked by the feeding challenge (n = 47) was significantly related to the milk yield immediately prior to the challenge (r = 0.86, P < 0.01). The correlation between the rate of recovery and the milk loss was (r = 0.94, P < 0.01). Further, there was no significant slope (P > 0.1) to the relationship between the ratio (rate of recovery / milk loss) and days from calving, indicating that the force of recovery was unaffected by stage of lactation. These results suggest that differential smoothing can be a useful tool for quantifying biological disturbances in animal performance and for extracting features that relate to an animal's potential and robustness. |
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Authors:
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M C Codrea; S Højsgaard; N C Friggens |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-4-8 |
Journal Detail:
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Title: Journal of animal science Volume: - ISSN: 1525-3163 ISO Abbreviation: - Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-4-11 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8003002 Medline TA: J Anim Sci Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Aarhus University, Faculty of Science and Technology, Department of Animal Health and Bioscience, Blichers Allé 20, P.O. Box 50, Tjele, 8830, Denmark. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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