Evaluation of mathematical models to describe growth of grazing young bulls
The objective of this study was to evaluate the use of different mathematical models to describe growth of grazing beef cattle. Data of 20 Nellore bulls with initial weight of 129±28.1 kg and final weight of 405±62.0 kg were used. The animals were randomly divided into four plots and placed on B. de...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Sociedade Brasileira de Zootecnia
2012-02-01
|
| Series: | Revista Brasileira de Zootecnia |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000200020 |
| _version_ | 1818426814166466560 |
|---|---|
| author | Henrique Jorge Fernandes Luis Orlindo Tedeschi Mário Fonseca Paulino Edenio Detmann Luisa Melville Paiva Sebastião de Campos Valadares Filho Aline Gomes da Silva José Augusto Gomes Azevêdo |
| author_facet | Henrique Jorge Fernandes Luis Orlindo Tedeschi Mário Fonseca Paulino Edenio Detmann Luisa Melville Paiva Sebastião de Campos Valadares Filho Aline Gomes da Silva José Augusto Gomes Azevêdo |
| author_sort | Henrique Jorge Fernandes |
| collection | DOAJ |
| description | The objective of this study was to evaluate the use of different mathematical models to describe growth of grazing beef cattle. Data of 20 Nellore bulls with initial weight of 129±28.1 kg and final weight of 405±62.0 kg were used. The animals were randomly divided into four plots and placed on B. decumbens Stapf pastures. Three plots received concentrate supplement with different protein profiles and the fourth plot received only mineral supplement. Animals were weighed every 28 days to design growth curve of full body weight. Five mathematical models were evaluated to describe animal growth: Multiphase, Linear, Logarithmic, Gompertz and Logistic models. Assessment of adequacy of the models was performed by using coefficient of determination, simultaneous F-test for identity of parameters, concordance correlation coefficient, root of the mean square error of prediction and partition of the mean square error of prediction. The analysis of the pairwise mean square error of prediction and the delta Akaike's information criterion were used to compare the models for accuracy and precision. Evaluation of all the tested models showed that all of them were able to predict variability among animals. However, Gompertz, Logarithmic and Logistic models created individual predictions that were not satisfactory. Models differed from each other concerning accuracy and precision; the best were in the following order: Multiphase, Linear, Gompertz, Logarithmic and Logistic. The Multiphase model was more efficient than the others for description of grazing beef cattle growth. |
| first_indexed | 2024-12-14T14:35:48Z |
| format | Article |
| id | doaj.art-4898f3d50f4640829eb19c4c4aaa8342 |
| institution | Directory Open Access Journal |
| issn | 1516-3598 1806-9290 |
| language | English |
| last_indexed | 2024-12-14T14:35:48Z |
| publishDate | 2012-02-01 |
| publisher | Sociedade Brasileira de Zootecnia |
| record_format | Article |
| series | Revista Brasileira de Zootecnia |
| spelling | doaj.art-4898f3d50f4640829eb19c4c4aaa83422022-12-21T22:57:39ZengSociedade Brasileira de ZootecniaRevista Brasileira de Zootecnia1516-35981806-92902012-02-0141236737310.1590/S1516-35982012000200020Evaluation of mathematical models to describe growth of grazing young bullsHenrique Jorge FernandesLuis Orlindo TedeschiMário Fonseca PaulinoEdenio DetmannLuisa Melville PaivaSebastião de Campos Valadares FilhoAline Gomes da SilvaJosé Augusto Gomes AzevêdoThe objective of this study was to evaluate the use of different mathematical models to describe growth of grazing beef cattle. Data of 20 Nellore bulls with initial weight of 129±28.1 kg and final weight of 405±62.0 kg were used. The animals were randomly divided into four plots and placed on B. decumbens Stapf pastures. Three plots received concentrate supplement with different protein profiles and the fourth plot received only mineral supplement. Animals were weighed every 28 days to design growth curve of full body weight. Five mathematical models were evaluated to describe animal growth: Multiphase, Linear, Logarithmic, Gompertz and Logistic models. Assessment of adequacy of the models was performed by using coefficient of determination, simultaneous F-test for identity of parameters, concordance correlation coefficient, root of the mean square error of prediction and partition of the mean square error of prediction. The analysis of the pairwise mean square error of prediction and the delta Akaike's information criterion were used to compare the models for accuracy and precision. Evaluation of all the tested models showed that all of them were able to predict variability among animals. However, Gompertz, Logarithmic and Logistic models created individual predictions that were not satisfactory. Models differed from each other concerning accuracy and precision; the best were in the following order: Multiphase, Linear, Gompertz, Logarithmic and Logistic. The Multiphase model was more efficient than the others for description of grazing beef cattle growth.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000200020grazing beef cattlemodelingseasonality |
| spellingShingle | Henrique Jorge Fernandes Luis Orlindo Tedeschi Mário Fonseca Paulino Edenio Detmann Luisa Melville Paiva Sebastião de Campos Valadares Filho Aline Gomes da Silva José Augusto Gomes Azevêdo Evaluation of mathematical models to describe growth of grazing young bulls Revista Brasileira de Zootecnia grazing beef cattle modeling seasonality |
| title | Evaluation of mathematical models to describe growth of grazing young bulls |
| title_full | Evaluation of mathematical models to describe growth of grazing young bulls |
| title_fullStr | Evaluation of mathematical models to describe growth of grazing young bulls |
| title_full_unstemmed | Evaluation of mathematical models to describe growth of grazing young bulls |
| title_short | Evaluation of mathematical models to describe growth of grazing young bulls |
| title_sort | evaluation of mathematical models to describe growth of grazing young bulls |
| topic | grazing beef cattle modeling seasonality |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000200020 |
| work_keys_str_mv | AT henriquejorgefernandes evaluationofmathematicalmodelstodescribegrowthofgrazingyoungbulls AT luisorlindotedeschi evaluationofmathematicalmodelstodescribegrowthofgrazingyoungbulls AT mariofonsecapaulino evaluationofmathematicalmodelstodescribegrowthofgrazingyoungbulls AT edeniodetmann evaluationofmathematicalmodelstodescribegrowthofgrazingyoungbulls AT luisamelvillepaiva evaluationofmathematicalmodelstodescribegrowthofgrazingyoungbulls AT sebastiaodecamposvaladaresfilho evaluationofmathematicalmodelstodescribegrowthofgrazingyoungbulls AT alinegomesdasilva evaluationofmathematicalmodelstodescribegrowthofgrazingyoungbulls AT joseaugustogomesazevedo evaluationofmathematicalmodelstodescribegrowthofgrazingyoungbulls |