Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/121199
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Título: | On the analysis of Canadian Holstein dairy cow lactation curves using standard growth functions |
Autor: | López, Secundino CSIC ORCID ; France, J.; Odongo, N. E.; McBride, R. A.; Kebreab, E.; AlZahal, O.; McBride, B. W.; Dijkistra, J. | Palabras clave: | Dairy cow Growth function Lactation curve Lactation trait |
Fecha de publicación: | abr-2015 | Editor: | Elsevier | Citación: | Journal of Dairy Science 98 (4): 2701-2712 (2015) | Resumen: | Six classical growth functions (monomolecular, Schumacher, Gompertz, logistic, Richards, and Morgan) were fitted to individual and average (by parity) cumulative milk production curves of Canadian Holstein dairy cows. The data analyzed consisted of approximately 91,000 daily milk yield records corresponding to 122 first, 99 second, and 92 third parity individual lactation curves. The functions were fitted using nonlinear regression procedures, and their performance was assessed using goodness-of-fit statistics (coefficient of determination, residual mean squares, Akaike information criterion, and the correlation and concordance coefficients between observed and adjusted milk yields at several days in milk). Overall, all the growth functions evaluated showed an acceptable fit to the cumulative milk production curves, with the Richards equation ranking first (smallest Akaike information criterion) followed by the Morgan equation. Differences among the functions in their goodness-of-fit were enlarged when fitted to average curves by parity, where the sigmoidal functions with a variable point of inflection (Richards and Morgan) outperformed the other 4 equations. All the functions provided satisfactory predictions of milk yield (calculated from the first derivative of the functions) at different lactation stages, from early to late lactation. The Richards and Morgan equations provided the most accurate estimates of peak yield and total milk production per 305-d lactation, whereas the least accurate estimates were obtained with the logistic equation. In conclusion, classical growth functions (especially sigmoidal functions with a variable point of inflection) proved to be feasible alternatives to fit cumulative milk production curves of dairy cows, resulting in suitable statistical performance and accurate estimates of lactation traits. | Descripción: | 12 páginas, 1 Figura, 7 Tablas. | Versión del editor: | http://dx.doi.org/ 10.3168/jds.2014-8132 | URI: | http://hdl.handle.net/10261/121199 | DOI: | 10.3168/jds.2014-8132 | ISSN: | 0022-0302 | E-ISSN: | 1525-3198 |
Aparece en las colecciones: | (IGM) Artículos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
---|---|---|---|---|
Embargo. Digital.CSIC..pdf | 21,67 kB | Adobe PDF | Visualizar/Abrir |
CORE Recommender
SCOPUSTM
Citations
38
checked on 07-may-2024
WEB OF SCIENCETM
Citations
37
checked on 18-feb-2024
Page view(s)
290
checked on 19-may-2024
Download(s)
197
checked on 19-may-2024
Google ScholarTM
Check
Altmetric
Altmetric
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.