Concentración de selenio en leche de estanques de rebaños lecheros del sur de Chile y su relación con indicadores productivos
Concentración de selenio en leche de estanques de rebaños lecheros del sur de Chile y su relación con indicadores productivos
Authors
Ceballos, A.
Espíndola, S.
Uslar, D.
Neumann, J.
Quiroz, E.
Chihuailaf Vivanco, Ricardo
Wittwer, F.
Espíndola, S.
Uslar, D.
Neumann, J.
Quiroz, E.
Chihuailaf Vivanco, Ricardo
Wittwer, F.
Authors
Date
2014-09-03
Datos de publicación:
http://dx.doi.org/10.4067/S0301-732X2013000100006
Keywords
Selenio - Bovino - Bovinos lecheros - Leche
Collections
Abstract
El objetivo de este estudio fue evaluar la concentración de selenio (Se) en muestras de leche procedentes de rebaños lecheros del sur de Chile y sus eventuales variaciones estacionales, y complementariamente examinar la eventual relación entre dicha concentración con algunos indicadores de producción. Para ello se seleccionaron 59 rebaños lecheros del sur de Chile, en los que se obtuvieron muestras de leche del estanque predial en cuatro oportunidades, primavera 2007 y verano, otoño e invierno del 2008 para determinar la concentración de Se en leche entera. Además, se colectó información del manejo, de la nutrición mineral en el predio y de indicadores de producción de leche, como producción media, contenido de grasa, proteína y recuento de células somáticas. Los datos fueron evaluados mediante modelos mixtos de regresión lineal. La concentración media de Se en leche del estanque fue 14,7 µg/L (DE: 6,5 µg/L), señalando una elevada varianza entre rebaños (44%), no observándose ninguna asociación con los parámetros productivos evaluados. Pese a lo anterior, un 82% del total de muestras colectadas (n = 231) presentaron valores < 20 µg/L. La concentración de Se en la leche de estanques de enfriamiento en rebaños lecheros seleccionados en el sur de Chile indica que las vacas presentan un inadecuado balance de Se, que no necesariamente se ve reflejado en una baja producción o calidad sanitaria de la leche.
An observational study was conducted in 59 Chilean dairy farms to evaluate bulk tank milk selenium (Se) concentration, and its association with measures of milk production parameters and udder health, measured as bulk tank somatic cell count. Fifty-nine dairy herds from Southern Chile were selected. Bulk tank milk samples were collected four times (Spring 2007 and Summer, Autumn and Winter 2008). A survey about general and nutritional management of the herds was conducted. Data on productive performance were also collected. Data were analyzed by using linear mixed models. Mean bulk tank milk Se concentration was 14.7 µg/L (SD: 6.5 µg/L), indicating a high variation among herds (44%). No association between bulk tank milk Se concentration and herd productive performance was observed. Nevertheless, 82% (n = 231) of bulk tank milk samples had a milk Se concentration lower than the reference of 20 µg/L. These results are indicating that bulk tank milk Se concentration in selected dairy herds from Southern Chile is lower than international reference values, reflecting an inadequate intake of Se. This inadequacy was not necessarily translated into low milk yield or low quality milk.
An observational study was conducted in 59 Chilean dairy farms to evaluate bulk tank milk selenium (Se) concentration, and its association with measures of milk production parameters and udder health, measured as bulk tank somatic cell count. Fifty-nine dairy herds from Southern Chile were selected. Bulk tank milk samples were collected four times (Spring 2007 and Summer, Autumn and Winter 2008). A survey about general and nutritional management of the herds was conducted. Data on productive performance were also collected. Data were analyzed by using linear mixed models. Mean bulk tank milk Se concentration was 14.7 µg/L (SD: 6.5 µg/L), indicating a high variation among herds (44%). No association between bulk tank milk Se concentration and herd productive performance was observed. Nevertheless, 82% (n = 231) of bulk tank milk samples had a milk Se concentration lower than the reference of 20 µg/L. These results are indicating that bulk tank milk Se concentration in selected dairy herds from Southern Chile is lower than international reference values, reflecting an inadequate intake of Se. This inadequacy was not necessarily translated into low milk yield or low quality milk.