NDLI: COMPARACIÓN DE ECUACIONES PARA AJUSTAR CURVAS DE LACTANCIA EN BOVINOS. Comparison of Equations to Fit Lactation Curves of Cattle.

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COMPARACIÓN DE ECUACIONES PARA AJUSTAR CURVAS DE LACTANCIA EN BOVINOS. Comparison of Equations to Fit Lactation Curves of Cattle.

Content Provider	Semantic Scholar
Author	García-Muñiz, José G. Martinez-Gonzalez, Enrique Núñez-Domínguez, Rafael Ramírez-Valverde, Rodolfo López-Ordaz, Rufino Ruíz-Flores, Agustín
Copyright Year	2008
Abstract	The objective was to evaluate the goodness of fit of 16 equations to estimate lactation curves of six cattle genotypes. Monthly or weekly milk production records of Brown Swiss (n=826 lactations), Bos indicus (BI, n=52), ¾BI¼Bos taurus (BT, n=507), ½BI½BT (n=462), BI BT (n=167) and ¼BI¾BT (n=62) cows were analyzed. Fitting of equations to individual lactations was performed by linear or non-linear regression. The residual mean squares obtained after fitting of the equations were ranked within genotype and compared by Friedman’s test. Additional criteria to compare the equations were the proportion of cases of abnormal daily milk production, and cases with positive autocorrelation. Equations differed (P<0.05) on their suitability to properly describe lactation curves across genotypes. However, for all genotypes the equation of best fit (P<0.05) was a reparameterization of Wood’s equation in which the first test date is considered as time zero. The use of this equation is recommended to fit lactation curves of cattle genotypes such as the ones evaluated in this study.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.saber.ula.ve/bitstream/handle/123456789/23635/articulo6.pdf;jsessionid=1E29DAC32D63538A7C225DF54A624750?sequence=2
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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