Determinación de la curva de lactancia en vacas mestizas de un hato de doble propósito en la Región Caribe de Colombia

Ossa, S Gustavo; Torrengroza, S Lino; Alvarado, Leonardo Garita

doi:10.21930/rcta.vol2_num1_art:163

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…On the other hand, Wood's model, one of the most frequently used models to fit lactation curves (Macciotta et al, 2001;Quintero et al, 2007), was the third most frequently selected; however, when checking the frequencies of typical curves without negative estimated milk yield, the Wood model was second in the ranking of most fitted models; in this group, the POL2 model was still the one that fitted most of the lactations (Table 2). Our results are in agreement with those reported by Ossa et al (1997) who found that, with the exception of first parity cows, a second order polynomial fit milk yield data better than the Wood's model in dual purpose-hybrid cows in the Caribbean region of Colombia. It is worth mentioning that, as can be seen in Table 2, the PB model did not yield atypical functions because 1 was always positive; using simple results from calculus, it can be shown that under this setting, this function cannot have such a shape.…”

Section: Discussionsupporting

confidence: 93%

“…This subset corresponds to the range where peak milk yield is usually attained; for example, a function having a maximum at 250 days would not be useful because this does not describe the usual behaviour; however, curves not following this trajectory (atypical curves) are frequently found. In the Colombian low tropic, it has been found that certain individuals do not show a peak, milk yield is described by a strictly decreasing function (Ossa et al, 1997); therefore, in this study, this class of curves was considered as typical; a total of 95 lactations fell in the atypical category (Table 3). As pointed out by Macciota et al (2003), when analyzing atypical curves, it is important to determine if they are the result of some biological phenomena or data-specific features such as missing data.…”

Section: Discussionmentioning

confidence: 98%

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Estimation of lactation curves of Gyr cattle and some associated production parameters in the Colombian low tropic

Ferro

Gil

Jiménez³

et al. 2021

Rev. colomb. cienc. pecu.

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Background: The Gyr breed is widely used in Colombian low tropic dairy production systems. During the last 10 years, the Asociación Colombiana de Criadores de Ganado Cebú† - ASOCEBU, has been leading a dairy milk control program which led to the creation of a dataset that permits to carry out the first analysis of milk yield in Gyr cattle in the country using records from several herds. Objectives: To study milk production dynamics of Gyr cattle in the Colombian low tropic through the estimation of lactation curves and four derived production parameters: total milk yield between 5 and 305 days (TMY305), peak milk yield (PMY), days at peak (DP) and persistency (P). Methods: 13,798 daily milk yield records from 1,510 cows performing in 103 herds were used; the total number of lactations was 2,480. Four models were considered: Wood, Wiltmink, Papajcsik & Bordero, and a second-degree polynomial. Mean square error, mean absolute error, mean square error of prediction, Akaike and Bayesian information criteria were used to select the model better describing each lactation using the majority rule, that is, the model selected by most criteria was the chosen one. The shape of each fitted lactation curve was checked using basic results from calculus which permitted the classification of the estimated curves into two groups: typical and atypical; only typical functions were used to compute the four aforementioned production parameters. Results: The second-order polynomial was the model most frequently selected, while the Papajcsik & Bordero model had the lowest frequency. Average TMY305, PMY, DP and P were 3,489.86 kg, 17.28 kg, 57.17 days, and 0.83, respectively, with coefficients of variation: 0.27, 0.21, 0.41, and 0.16. Conclusions: This study permitted to identify individuals with outstanding phenotypic performance. To the best of our knowledge, this is the first study of this kind involving thousands of lactations from Gyr cows performing in several regions of Colombian low tropic.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 98%

Estimation of lactation curves of Gyr cattle and some associated production parameters in the Colombian low tropic

Ferro

Gil

Jiménez³

et al. 2021

Rev. colomb. cienc. pecu.

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Comparison of standard lactation curve models using fortnightly milk records in Frieswal cattle

Dohare¹,

Verma²,

Perme³

et al. 2014

Vet World

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The aim was to compare standard lactation curve models using fortnightly milk records in Frieswal cattle. Materials and Methods:A total of 2904 fortnightly milk yield (FMY) records from 132 Frieswal cattle maintained at Military Farm, Bareilly, Uttar Pradesh were taken for study. The Wood (WD), Morant and Gnanasakthy (MG), Mitscherlich x Exponential (ME), and Wilmink (WK) models were fitted on average FMY (AFMY) by nonlinear regression using statistical package SAS 9.3 version. The goodness of fit of models was judged by the adjusted coefficient of determination (Adj. R 2 ) and root mean square error. Results:The AFMY ranges from 127.09 kg (first fortnight) to 110.04 kg (last fortnight) with peak fortnight yield of 189.51 kg and peak period at fourth fortnight. Predicted peak yield by different models ranges from 182.7 to 190.2 kg. The herd average milk yield was predicted with a high degree of accuracy (Adj. R 2 >92%) by all models with the maximum accuracy (Adj. R 2 =99.20%) obtained by ME model followed by MG (Adj. R 2 =98.8%) and WK model (Adj. R 2 =96.0%). Conclusion:The ME model provided best fit for FMY data in Frieswal cattle followed by WK and MG model, whereas WD model fitted least.

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Modelo matemático aplicado a la curva de lactancia en ganado vacuno dobre propósito

Botero

Vertel

2006

Rev MVZ Córdoba

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Objetivo. Seleccionar un modelo matemático para la curva de lactancia de la producción de leche de hembras vacunas. Materiales y métodos. Durante 11 meses, se estudió la producción de leche en 500 novillas doble propósito Bos taurus x Bos indicus, de las sabanas del trópico bajo colombiano. La producción se cuantificó en kilogramos. Se incluyeron los datos de la producción de leche en época (seca-lluviosa) y número de lactancias (primera; segunda y tercera y, más de tres). Los datos hacen parte del archivo de la Ganadería XB, ubicada en las sabanas de Bolívar, Colombia, recopilados desde el año 1990 hasta el 2000. A estos datos se le aplicó los modelos lineal simple, cuadrático, lineal logarítmico, cuadrático logarítmico, gamma incompleto, lineal hiperbólico y polinomial inverso. Los parámetros para los modelos gamma incompleto y polinomial inverso fueron estimados, a partir del método de “Gauss-Newton”, para la regresión no lineal; los demás modelos fueron ajustados por regresión lineal de las producciones, en función de los meses en lactancia, por el método de los cuadrados mínimos. Resultados. En los modelos propuestos, se observó que el modelo polinomial inverso es el que mejor caracteriza la curva de lactancia por presentar los mayores valores para el estadístico Durbin-Watson y coeficiente de determinación (R2) y sobre dicho modelo existe información necesaria para obtener parámetros prácticos calculados a partir de la ecuación de la curva de lactancia. Conclusión. El modelo matemático polinomial inverso se constituye en una excelente herramienta para aplicar en la administración y toma de decisiones en el manejo de hatos del sistema de doble propósito.

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Determinación de la curva de lactancia en vacas mestizas de un hato de doble propósito en la Región Caribe de Colombia

Cited by 4 publications

References 8 publications

Estimation of lactation curves of Gyr cattle and some associated production parameters in the Colombian low tropic

Estimation of lactation curves of Gyr cattle and some associated production parameters in the Colombian low tropic

Comparison of standard lactation curve models using fortnightly milk records in Frieswal cattle

Modelo matemático aplicado a la curva de lactancia en ganado vacuno dobre propósito

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