MODELOS MATEMÁTICOS PARA AJUSTE DA CURVA DE LACTAÇÃO DE VACAS HOLANDESAS CRIADAS NO OESTE DE SANTA CATARINA

Marinês Lazzari; Mariana De Almeida Dornelles; Dionéia Magda Everling; Paulo Santana Pacheco; Julio Viégas; Paulo Roberto Nogara Rorato; Alan Miranda Prestes; Lucas Giacomelli; Tiago Bresolin; Cristian Gilberto Pivetta

doi:10.7213/academica.011.002.ao03

MODELOS MATEMÁTICOS PARA AJUSTE DA CURVA DE LACTAÇÃO DE VACAS HOLANDESAS CRIADAS NO OESTE DE SANTA CATARINA

Translated title of the contribution: Mathematical models to adjust the lactation curve of holstein cows raised in the Western region of Santa Catarina State, Brazil

Marinês Lazzari, Mariana De Almeida Dornelles, Dionéia Magda Everling, Paulo Santana Pacheco, Julio Viégas, Paulo Roberto Nogara Rorato, Alan Miranda Prestes, Lucas Giacomelli, Tiago Bresolin, Cristian Gilberto Pivetta

Research output: Contribution to journal › Article › peer-review

Abstract

To Identify the best model to describe the lactation curve of dairy cows from the Western region of Santa Catarina State, brazil, among the various mathematical functions cited in literature. Milking control data (1.284) from 129 Holstein cows were used. Model parameters were estimated by non-linear regression through NLIN procedure (SAS System), using the Gauss-Newton method. The criteria for choosing the best model were: quasi-minimal re-sidual, mean absolute eviation, coefficient of determination (R²), best fit index, visual assessment of estimated and observed curves, and the residuals distribution graph. The model of Wood (1967) was the best to describe the lac-tation curve of cows, presenting R² of 0.95, DMA of 0.56, QMR of 27.57, the lowest index (4.86), the lowest residual range (between 0.5 and -0.5 liters) and an estimated curve more consistent with the observed.

Translated title of the contribution	Mathematical models to adjust the lactation curve of holstein cows raised in the Western region of Santa Catarina State, Brazil
Original language	Portuguese
Pages (from-to)	137-143
Journal	Revista Academica Ciencia Animal
Volume	11
Issue number	2
DOIs	https://doi.org/10.7213/academica.011.002.ao03
State	Published - Apr 1 2013
Externally published	Yes

Keywords

Non-linear models
Projection of lactation
Milk production
Peak milk production

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Lazzari, M., Dornelles, M. D. A., Everling, D. M., Pacheco, P. S., Viégas, J., Rorato, P. R. N., Prestes, A. M., Giacomelli, L., Bresolin, T., & Pivetta, C. G. (2013). MODELOS MATEMÁTICOS PARA AJUSTE DA CURVA DE LACTAÇÃO DE VACAS HOLANDESAS CRIADAS NO OESTE DE SANTA CATARINA. Revista Academica Ciencia Animal, 11(2), 137-143. https://doi.org/10.7213/academica.011.002.ao03

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abstract = "To Identify the best model to describe the lactation curve of dairy cows from the Western region of Santa Catarina State, brazil, among the various mathematical functions cited in literature. Milking control data (1.284) from 129 Holstein cows were used. Model parameters were estimated by non-linear regression through NLIN procedure (SAS System), using the Gauss-Newton method. The criteria for choosing the best model were: quasi-minimal re-sidual, mean absolute eviation, coefficient of determination (R²), best fit index, visual assessment of estimated and observed curves, and the residuals distribution graph. The model of Wood (1967) was the best to describe the lac-tation curve of cows, presenting R² of 0.95, DMA of 0.56, QMR of 27.57, the lowest index (4.86), the lowest residual range (between 0.5 and -0.5 liters) and an estimated curve more consistent with the observed.",

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author = "Marin{\^e}s Lazzari and Dornelles, {Mariana De Almeida} and Everling, {Dion{\'e}ia Magda} and Pacheco, {Paulo Santana} and Julio Vi{\'e}gas and Rorato, {Paulo Roberto Nogara} and Prestes, {Alan Miranda} and Lucas Giacomelli and Tiago Bresolin and Pivetta, {Cristian Gilberto}",

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doi = "10.7213/academica.011.002.ao03",

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AU - Lazzari, Marinês

AU - Dornelles, Mariana De Almeida

AU - Everling, Dionéia Magda

AU - Pacheco, Paulo Santana

AU - Viégas, Julio

AU - Rorato, Paulo Roberto Nogara

AU - Prestes, Alan Miranda

AU - Giacomelli, Lucas

AU - Bresolin, Tiago

AU - Pivetta, Cristian Gilberto

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AB - To Identify the best model to describe the lactation curve of dairy cows from the Western region of Santa Catarina State, brazil, among the various mathematical functions cited in literature. Milking control data (1.284) from 129 Holstein cows were used. Model parameters were estimated by non-linear regression through NLIN procedure (SAS System), using the Gauss-Newton method. The criteria for choosing the best model were: quasi-minimal re-sidual, mean absolute eviation, coefficient of determination (R²), best fit index, visual assessment of estimated and observed curves, and the residuals distribution graph. The model of Wood (1967) was the best to describe the lac-tation curve of cows, presenting R² of 0.95, DMA of 0.56, QMR of 27.57, the lowest index (4.86), the lowest residual range (between 0.5 and -0.5 liters) and an estimated curve more consistent with the observed.

KW - Non-linear models

KW - Projection of lactation

KW - Milk production

KW - Peak milk production

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JO - Revista Academica Ciencia Animal

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MODELOS MATEMÁTICOS PARA AJUSTE DA CURVA DE LACTAÇÃO DE VACAS HOLANDESAS CRIADAS NO OESTE DE SANTA CATARINA

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Keywords

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