Characterization of commercial and biological growth curves in the Segureña sheep breed
Non-linear models were analysed to describe both the biological and commercial growth curves of the Segureña sheep, one of the most important Spanish breeds. We evaluated Brody, von Bertalanffy, Verhulst, logistic and Gompertz models, using historical data from the National Association of Segureña S...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2015-01-01
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| Series: | Animal |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1751731115000567 |
| _version_ | 1819100527532703744 |
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| author | T.M. Lupi S. Nogales J.M. León C. Barba J.V. Delgado |
| author_facet | T.M. Lupi S. Nogales J.M. León C. Barba J.V. Delgado |
| author_sort | T.M. Lupi |
| collection | DOAJ |
| description | Non-linear models were analysed to describe both the biological and commercial growth curves of the Segureña sheep, one of the most important Spanish breeds. We evaluated Brody, von Bertalanffy, Verhulst, logistic and Gompertz models, using historical data from the National Association of Segureña Sheep Breeders (ANCOS). These records were collected between 2000 and 2013, from a total of 129 610 weight observations ranging from birth to adulthood. The aim of this research was to establish the mathematical behaviour of body development throughout this breed’s commercial life (birth to slaughter) and biological life (birth to adulthood); comparison between both slopes gives important information regarding the best time for slaughter, informs dietary advice according to animals’ needs, permits economical predictions of productions and, by using the curve parameters as selection criteria, enables improvements in growth characteristics of the breed. Models were fitted according to the non-linear regression procedure of statistical package SPSS version19. Model parameters were estimated using the Levenberg–Marquardt algorithm. Candidate models were compared using the determinative coefficient, mean square error, number of iterations, Akaike information coefficient and biological coherence of the estimated parameters. The von Bertalanffy and logistic models were found to be best suited to the biological and commercial growth curves, respectively, for both sexes. The Brody equation was found to be unsuitable for studying the commercial growth curve. Differences between the parameters in both sexes indicate a strong impact of sexual dimorphism on growth. This can emphasize the value of the highest growth rate for females, indicating that they reach maturity earlier. |
| first_indexed | 2024-12-22T01:04:12Z |
| format | Article |
| id | doaj.art-3652d5e103c144dab95e27ebdc550e76 |
| institution | Directory Open Access Journal |
| issn | 1751-7311 |
| language | English |
| last_indexed | 2024-12-22T01:04:12Z |
| publishDate | 2015-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Animal |
| spelling | doaj.art-3652d5e103c144dab95e27ebdc550e762022-12-21T18:44:08ZengElsevierAnimal1751-73112015-01-019813411348Characterization of commercial and biological growth curves in the Segureña sheep breedT.M. Lupi0S. Nogales1J.M. León2C. Barba3J.V. Delgado4Escola Superior Agrária do Instituto Politécnico de Castelo Branco, 6001-909 Castelo Branco, PortugalDepartamento de Genética, Universidad de Córdoba, Campus Universitario de Rabanales, 14071-Córdoba, SpainCentro Agropecuario Diputación de Córdoba, 14071-Córdoba, SpainDepartamento de Producción Animal, Universidad de Córdoba, Campus Universitario de Rabanales, 14071-Córdoba, SpainDepartamento de Genética, Universidad de Córdoba, Campus Universitario de Rabanales, 14071-Córdoba, SpainNon-linear models were analysed to describe both the biological and commercial growth curves of the Segureña sheep, one of the most important Spanish breeds. We evaluated Brody, von Bertalanffy, Verhulst, logistic and Gompertz models, using historical data from the National Association of Segureña Sheep Breeders (ANCOS). These records were collected between 2000 and 2013, from a total of 129 610 weight observations ranging from birth to adulthood. The aim of this research was to establish the mathematical behaviour of body development throughout this breed’s commercial life (birth to slaughter) and biological life (birth to adulthood); comparison between both slopes gives important information regarding the best time for slaughter, informs dietary advice according to animals’ needs, permits economical predictions of productions and, by using the curve parameters as selection criteria, enables improvements in growth characteristics of the breed. Models were fitted according to the non-linear regression procedure of statistical package SPSS version19. Model parameters were estimated using the Levenberg–Marquardt algorithm. Candidate models were compared using the determinative coefficient, mean square error, number of iterations, Akaike information coefficient and biological coherence of the estimated parameters. The von Bertalanffy and logistic models were found to be best suited to the biological and commercial growth curves, respectively, for both sexes. The Brody equation was found to be unsuitable for studying the commercial growth curve. Differences between the parameters in both sexes indicate a strong impact of sexual dimorphism on growth. This can emphasize the value of the highest growth rate for females, indicating that they reach maturity earlier.http://www.sciencedirect.com/science/article/pii/S1751731115000567growthmodelssexsheepZootechny |
| spellingShingle | T.M. Lupi S. Nogales J.M. León C. Barba J.V. Delgado Characterization of commercial and biological growth curves in the Segureña sheep breed Animal growth models sex sheep Zootechny |
| title | Characterization of commercial and biological growth curves in the Segureña sheep breed |
| title_full | Characterization of commercial and biological growth curves in the Segureña sheep breed |
| title_fullStr | Characterization of commercial and biological growth curves in the Segureña sheep breed |
| title_full_unstemmed | Characterization of commercial and biological growth curves in the Segureña sheep breed |
| title_short | Characterization of commercial and biological growth curves in the Segureña sheep breed |
| title_sort | characterization of commercial and biological growth curves in the segurena sheep breed |
| topic | growth models sex sheep Zootechny |
| url | http://www.sciencedirect.com/science/article/pii/S1751731115000567 |
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