Estimation of growth in intact grazing Holstein steers
ABSTRACT: animal growth does not follow a linear pattern. Accordingly, fitted non-linear models are used to analyze the relationship between growth rate and age. Objective: to assess the ability of several mathematical models (Gompertz, Brody, and von Bertalanffy) to describe growth and development...
- Autores:
-
Posada Ochoa, Sandra Lucía
Rosero Noguera, Jaime Ricardo
Hoyos Velásquez, Álvaro Hernán
Cerón Alzate, Juan Manuel
Velásquez Vélez, Raúl
- Tipo de recurso:
- Article of investigation
- Fecha de publicación:
- 2013
- Institución:
- Universidad de Antioquia
- Repositorio:
- Repositorio UdeA
- Idioma:
- eng
- OAI Identifier:
- oai:bibliotecadigital.udea.edu.co:10495/10212
- Acceso en línea:
- http://hdl.handle.net/10495/10212
- Palabra clave:
- Brody
Dairy steers
Mathematical models
Von Bertalanffy
Gompertz
- Rights
- openAccess
- License
- Atribución-NoComercial-CompartirIgual 2.5 Colombia (CC BY-NC-SA 2.5 CO)
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| dc.title.spa.fl_str_mv |
Estimation of growth in intact grazing Holstein steers |
| dc.title.alternative.spa.fl_str_mv |
Estimación del crecimiento en terneros enteros Holstein en pastoreo |
| title |
Estimation of growth in intact grazing Holstein steers |
| spellingShingle |
Estimation of growth in intact grazing Holstein steers Brody Dairy steers Mathematical models Von Bertalanffy Gompertz |
| title_short |
Estimation of growth in intact grazing Holstein steers |
| title_full |
Estimation of growth in intact grazing Holstein steers |
| title_fullStr |
Estimation of growth in intact grazing Holstein steers |
| title_full_unstemmed |
Estimation of growth in intact grazing Holstein steers |
| title_sort |
Estimation of growth in intact grazing Holstein steers |
| dc.creator.fl_str_mv |
Posada Ochoa, Sandra Lucía Rosero Noguera, Jaime Ricardo Hoyos Velásquez, Álvaro Hernán Cerón Alzate, Juan Manuel Velásquez Vélez, Raúl |
| dc.contributor.author.none.fl_str_mv |
Posada Ochoa, Sandra Lucía Rosero Noguera, Jaime Ricardo Hoyos Velásquez, Álvaro Hernán Cerón Alzate, Juan Manuel Velásquez Vélez, Raúl |
| dc.subject.none.fl_str_mv |
Brody Dairy steers Mathematical models Von Bertalanffy Gompertz |
| topic |
Brody Dairy steers Mathematical models Von Bertalanffy Gompertz |
| description |
ABSTRACT: animal growth does not follow a linear pattern. Accordingly, fitted non-linear models are used to analyze the relationship between growth rate and age. Objective: to assess the ability of several mathematical models (Gompertz, Brody, and von Bertalanffy) to describe growth and development patterns of grazing Holstein males (Bos taurus). Methods: twenty eight intact Holstein steers (average weight 203.8 ± 37.5 kg) were used in the study. The animals grazed on Kikuyu grass pastures (Pennisetum clandestinum) and were supplemented with 1 kg dry matter of reconstituted grain silage until weight reached 301.9 ± 47.9 kg. Animals were weighed at the beginning of the experiment and monthly thereafter from 14 to 21 months of age. The Marquardt's iterative algorithm of PROC NLIN procedure for non-linear models available in the SAS software was used to fit the data to each model and estimate the parameters. Results: Brody model reached the highest estimated value for adult weight (1,097.6 kg) while the Gompertz model displayed the lowest value (795 kg). Bertalanffy model indicated the lowest estimate for maturity index (0.0028) while the highest estimate was obtained by Gompertz (0.0047), being statistically different (p < 0.05). Conclusions: Gompertz model best described growth of intact Holstein steers under rotational grazing and feed supplementation. |
| publishDate |
2013 |
| dc.date.issued.none.fl_str_mv |
2013 |
| dc.date.accessioned.none.fl_str_mv |
2018-10-05T13:19:58Z |
| dc.date.available.none.fl_str_mv |
2018-10-05T13:19:58Z |
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info:eu-repo/semantics/article |
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http://purl.org/coar/version/c_970fb48d4fbd8a85 |
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http://purl.org/coar/resource_type/c_2df8fbb1 |
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https://purl.org/redcol/resource_type/ART |
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Artículo de investigación |
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http://purl.org/coar/resource_type/c_2df8fbb1 |
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publishedVersion |
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Velásquez R, Noguera RR, Posada SL, Hoyos A, Cerón JM. Estimation of growth in intact grazing Holstein steers. Rev Colomb Cienc Pecu 2013 Sep; 26(3): 169-176 |
| dc.identifier.issn.none.fl_str_mv |
0120-0690 |
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http://hdl.handle.net/10495/10212 |
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2256-2958 |
| identifier_str_mv |
Velásquez R, Noguera RR, Posada SL, Hoyos A, Cerón JM. Estimation of growth in intact grazing Holstein steers. Rev Colomb Cienc Pecu 2013 Sep; 26(3): 169-176 0120-0690 2256-2958 |
| url |
http://hdl.handle.net/10495/10212 |
| dc.language.iso.spa.fl_str_mv |
eng |
| language |
eng |
| dc.relation.ispartofjournalabbrev.spa.fl_str_mv |
Rev. Colomb. Cienc. Pecu. |
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Atribución-NoComercial-CompartirIgual 2.5 Colombia (CC BY-NC-SA 2.5 CO) |
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info:eu-repo/semantics/openAccess |
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https://creativecommons.org/licenses/by-nc-sa/2.5/co/ |
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Atribución-NoComercial-CompartirIgual 2.5 Colombia (CC BY-NC-SA 2.5 CO) https://creativecommons.org/licenses/by-nc-sa/2.5/co/ http://purl.org/coar/access_right/c_abf2 https://creativecommons.org/licenses/by-nc-sa/4.0/ |
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openAccess |
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application/pdf |
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Universidad de Antioquia, Facultad de Ciencias Agrarias |
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Medellín, Colombia |
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Universidad de Antioquia |
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Posada Ochoa, Sandra LucíaRosero Noguera, Jaime RicardoHoyos Velásquez, Álvaro HernánCerón Alzate, Juan ManuelVelásquez Vélez, Raúl2018-10-05T13:19:58Z2018-10-05T13:19:58Z2013Velásquez R, Noguera RR, Posada SL, Hoyos A, Cerón JM. Estimation of growth in intact grazing Holstein steers. Rev Colomb Cienc Pecu 2013 Sep; 26(3): 169-1760120-0690http://hdl.handle.net/10495/102122256-2958ABSTRACT: animal growth does not follow a linear pattern. Accordingly, fitted non-linear models are used to analyze the relationship between growth rate and age. Objective: to assess the ability of several mathematical models (Gompertz, Brody, and von Bertalanffy) to describe growth and development patterns of grazing Holstein males (Bos taurus). Methods: twenty eight intact Holstein steers (average weight 203.8 ± 37.5 kg) were used in the study. The animals grazed on Kikuyu grass pastures (Pennisetum clandestinum) and were supplemented with 1 kg dry matter of reconstituted grain silage until weight reached 301.9 ± 47.9 kg. Animals were weighed at the beginning of the experiment and monthly thereafter from 14 to 21 months of age. The Marquardt's iterative algorithm of PROC NLIN procedure for non-linear models available in the SAS software was used to fit the data to each model and estimate the parameters. Results: Brody model reached the highest estimated value for adult weight (1,097.6 kg) while the Gompertz model displayed the lowest value (795 kg). Bertalanffy model indicated the lowest estimate for maturity index (0.0028) while the highest estimate was obtained by Gompertz (0.0047), being statistically different (p < 0.05). Conclusions: Gompertz model best described growth of intact Holstein steers under rotational grazing and feed supplementation.RESUMEN: los animales en crecimiento no siguen un patrón lineal; así que para describir este patrón se necesitan modelos no lineales ajustados, que analicen la relación entre la velocidad de crecimiento y la edad del animal. Objetivo: evaluar los modelos matemáticos Gompertz, Brody y von Bertalanffy de acuerdo con su capacidad para describir el patrón de crecimiento y desarrollo de los machos Holstein (Bos taurus) en pastoreo. Métodos: el estudio experimental se realizó con 28 novillos enteros de raza Holstein, con peso vivo promedio de 203,8 ± 37,5 Kg. Los animales permanecieron en pastoreo rotacional de pasto kikuyo (Pennisetum clandestinum) y fueron suplementados con 1 Kg de materia seca de silo de grano reconstituido hasta alcanzar un peso promedio de 301,9 Kg. ± 47,9 Kg. Los animales fueron pesados al inicio del experimento y luego con intervalos de 30 días, obteniendo información desde los 14 hasta los 21 meses de vida. El ajuste de los datos a cada modelo y las estimativas de los parámetros se realizaron por medio iterativo del algoritmo Marquardt del procedimiento para modelos no lineales PROC NLIN de SAS. Resultados: el modelo Brody alcanzó el mayor valor estimado para el parámetro "peso maduro" (1097, 6 Kg) y el modelo Gompertz obtuvo el menor valor (795 Kg). El modelo de Bertalanffy presentó el menor estimativo del parámetro "índice de madurez" (0,0028), mientras que el mayor estimativo lo presentó el modelo de Gompertz (0,0047), mostrando diferencia significativa (p < 0,05). Conclusiones: el modelo de Gompertz fue el que mejor describió el patrón de crecimiento de los machos Holstein en pastoreo rotacional con suplementaciónapplication/pdfengUniversidad de Antioquia, Facultad de Ciencias AgrariasMedellín, Colombiainfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_2df8fbb1https://purl.org/redcol/resource_type/ARTArtículo de investigaciónhttp://purl.org/coar/version/c_970fb48d4fbd8a85Atribución-NoComercial-CompartirIgual 2.5 Colombia (CC BY-NC-SA 2.5 CO)info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/co/http://purl.org/coar/access_right/c_abf2https://creativecommons.org/licenses/by-nc-sa/4.0/BrodyDairy steersMathematical modelsVon BertalanffyGompertzEstimation of growth in intact grazing Holstein steersEstimación del crecimiento en terneros enteros Holstein en pastoreoRev. Colomb. Cienc. Pecu.Revista Colombiana de Ciencias Pecuarias169176263ORIGINALPosadaOchoaSandraLucia_2013_EstimationGrowthIntact.pdfPosadaOchoaSandraLucia_2013_EstimationGrowthIntact.pdfArtículo de investigaciónapplication/pdf452008https://bibliotecadigital.udea.edu.co/bitstream/10495/10212/1/PosadaOchoaSandraLucia_2013_EstimationGrowthIntact.pdfde6f9476e9b2dcf16e080f180a31eeeeMD51CC-LICENSElicense_urllicense_urltext/plain; charset=utf-849https://bibliotecadigital.udea.edu.co/bitstream/10495/10212/2/license_url4afdbb8c545fd630ea7db775da747b2fMD52license_textlicense_texttext/html; charset=utf-80https://bibliotecadigital.udea.edu.co/bitstream/10495/10212/3/license_textd41d8cd98f00b204e9800998ecf8427eMD53license_rdflicense_rdfLicenciaapplication/rdf+xml; charset=utf-80https://bibliotecadigital.udea.edu.co/bitstream/10495/10212/4/license_rdfd41d8cd98f00b204e9800998ecf8427eMD54LICENSElicense.txtlicense.txttext/plain; charset=utf-81748https://bibliotecadigital.udea.edu.co/bitstream/10495/10212/5/license.txt8a4605be74aa9ea9d79846c1fba20a33MD5510495/10212oai:bibliotecadigital.udea.edu.co:10495/102122021-05-21 20:30:31.505Repositorio Institucional Universidad de Antioquiaandres.perez@udea.edu.coTk9URTogUExBQ0UgWU9VUiBPV04gTElDRU5TRSBIRVJFClRoaXMgc2FtcGxlIGxpY2Vuc2UgaXMgcHJvdmlkZWQgZm9yIGluZm9ybWF0aW9uYWwgcHVycG9zZXMgb25seS4KCk5PTi1FWENMVVNJVkUgRElTVFJJQlVUSU9OIExJQ0VOU0UKCkJ5IHNpZ25pbmcgYW5kIHN1Ym1pdHRpbmcgdGhpcyBsaWNlbnNlLCB5b3UgKHRoZSBhdXRob3Iocykgb3IgY29weXJpZ2h0Cm93bmVyKSBncmFudHMgdG8gRFNwYWNlIFVuaXZlcnNpdHkgKERTVSkgdGhlIG5vbi1leGNsdXNpdmUgcmlnaHQgdG8gcmVwcm9kdWNlLAp0cmFuc2xhdGUgKGFzIGRlZmluZWQgYmVsb3cpLCBhbmQvb3IgZGlzdHJpYnV0ZSB5b3VyIHN1Ym1pc3Npb24gKGluY2x1ZGluZwp0aGUgYWJzdHJhY3QpIHdvcmxkd2lkZSBpbiBwcmludCBhbmQgZWxlY3Ryb25pYyBmb3JtYXQgYW5kIGluIGFueSBtZWRpdW0sCmluY2x1ZGluZyBidXQgbm90IGxpbWl0ZWQgdG8gYXVkaW8gb3IgdmlkZW8uCgpZb3UgYWdyZWUgdGhhdCBEU1UgbWF5LCB3aXRob3V0IGNoYW5naW5nIHRoZSBjb250ZW50LCB0cmFuc2xhdGUgdGhlCnN1Ym1pc3Npb24gdG8gYW55IG1lZGl1bSBvciBmb3JtYXQgZm9yIHRoZSBwdXJwb3NlIG9mIHByZXNlcnZhdGlvbi4KCllvdSBhbHNvIGFncmVlIHRoYXQgRFNVIG1heSBrZWVwIG1vcmUgdGhhbiBvbmUgY29weSBvZiB0aGlzIHN1Ym1pc3Npb24gZm9yCnB1cnBvc2VzIG9mIHNlY3VyaXR5LCBiYWNrLXVwIGFuZCBwcmVzZXJ2YXRpb24uCgpZb3UgcmVwcmVzZW50IHRoYXQgdGhlIHN1Ym1pc3Npb24gaXMgeW91ciBvcmlnaW5hbCB3b3JrLCBhbmQgdGhhdCB5b3UgaGF2ZQp0aGUgcmlnaHQgdG8gZ3JhbnQgdGhlIHJpZ2h0cyBjb250YWluZWQgaW4gdGhpcyBsaWNlbnNlLiBZb3UgYWxzbyByZXByZXNlbnQKdGhhdCB5b3VyIHN1Ym1pc3Npb24gZG9lcyBub3QsIHRvIHRoZSBiZXN0IG9mIHlvdXIga25vd2xlZGdlLCBpbmZyaW5nZSB1cG9uCmFueW9uZSdzIGNvcHlyaWdodC4KCklmIHRoZSBzdWJtaXNzaW9uIGNvbnRhaW5zIG1hdGVyaWFsIGZvciB3aGljaCB5b3UgZG8gbm90IGhvbGQgY29weXJpZ2h0LAp5b3UgcmVwcmVzZW50IHRoYXQgeW91IGhhdmUgb2J0YWluZWQgdGhlIHVucmVzdHJpY3RlZCBwZXJtaXNzaW9uIG9mIHRoZQpjb3B5cmlnaHQgb3duZXIgdG8gZ3JhbnQgRFNVIHRoZSByaWdodHMgcmVxdWlyZWQgYnkgdGhpcyBsaWNlbnNlLCBhbmQgdGhhdApzdWNoIHRoaXJkLXBhcnR5IG93bmVkIG1hdGVyaWFsIGlzIGNsZWFybHkgaWRlbnRpZmllZCBhbmQgYWNrbm93bGVkZ2VkCndpdGhpbiB0aGUgdGV4dCBvciBjb250ZW50IG9mIHRoZSBzdWJtaXNzaW9uLgoKSUYgVEhFIFNVQk1JU1NJT04gSVMgQkFTRUQgVVBPTiBXT1JLIFRIQVQgSEFTIEJFRU4gU1BPTlNPUkVEIE9SIFNVUFBPUlRFRApCWSBBTiBBR0VOQ1kgT1IgT1JHQU5JWkFUSU9OIE9USEVSIFRIQU4gRFNVLCBZT1UgUkVQUkVTRU5UIFRIQVQgWU9VIEhBVkUKRlVMRklMTEVEIEFOWSBSSUdIVCBPRiBSRVZJRVcgT1IgT1RIRVIgT0JMSUdBVElPTlMgUkVRVUlSRUQgQlkgU1VDSApDT05UUkFDVCBPUiBBR1JFRU1FTlQuCgpEU1Ugd2lsbCBjbGVhcmx5IGlkZW50aWZ5IHlvdXIgbmFtZShzKSBhcyB0aGUgYXV0aG9yKHMpIG9yIG93bmVyKHMpIG9mIHRoZQpzdWJtaXNzaW9uLCBhbmQgd2lsbCBub3QgbWFrZSBhbnkgYWx0ZXJhdGlvbiwgb3RoZXIgdGhhbiBhcyBhbGxvd2VkIGJ5IHRoaXMKbGljZW5zZSwgdG8geW91ciBzdWJtaXNzaW9uLgo= |