Relaciones entre el recuento de células somáticas, test de mastitis California, conductividad eléctrica y el diagnósticode mastitis subclínicas en cabras lecheras

Recibido el 08 de mayo de 2013 // Aceptado el 20 de mayo de 2014 // Publicado online el 04 de junio de 2014

SUAREZ, V.H. 1; MARTINEZ, G.M. 1; GIANRE, V. 2; CALVINHO, L. 2; RACHOSKI, A. 1; CHAVEZ, M. 1; SALATIN, A. 1; OROZCO, S. 1; SANCHEZ, V. 1; BERTONI, E. 1

Resumen
En el tambo caprino, las mastitis son un problema sanitario mayor que afecta tanto la productividad como la  inocuidad y calidad de los productos. Debido a que el diagnóstico de las mastitis subclínicas plantea problemas  para su correcto monitoreo, el objetivo planteado fue analizar las relaciones entre el estado infeccioso de las  mamas, los iferentes métodos de diagnóstico como el conteo de células somáticas (CCS), test de mastitis
California (CMT) y la conductividad eléctrica (CE) y sus relaciones y posibilidades de aplicación en las condiciones de los tambos caprinos del país. A partir de cabras, mayormente Saanen (71,9%) en ordeño en los  períodos sept/2010-mar/2011 y jun/2011-dic/2011, se tomaron mensualmente muestras de leche individuales  (n=846) de cada medio mamario. El estado infeccioso de cada muestra se determinó por cultivos bacterioló

Abstract
Mastitis in udders is a major health problem, affecting productivity, safety and product quality in the dairy  goat. Because the diagnosis of subclinical mastitis is problematic for accurate monitoring, the objective of this study is to evaluate the relationships among the infectious status of half udder and different diagnosis methods: omatic cell count (SCC), California mastitis test (CMT) and electric conductivity (CE) and its diagnostic ossibilities in the real dairy goat systems. From milked goats (Saanen, 76%) during Sept/2010-March/2011 and june11/2011 periods, monthly samples (n=846) of milk were taken from each half udder. Udder  halves infectious status was assessed by bacteriological cultures and classified in three groups: negative  culture (NI), and intrammary infections by minor pathogens and by major pathogens. Chi square, analysis of  variance and correlation and regression analysis were carried out to analyse interrelations between variables.  Sensitivity (S), specificity (SP) and predictive values (VP) were calculated. Coagulase-negative Staphylococcus  sp SCN (n=37), were the minor pathogen and Staphylococcus aureus (n=13), was the only major pathogen isolated. Pathogen increase CCS (P<0001) and CMT (P<0.0001) but not CE (0.09). The average values for CCS of NI, SCN y S. aureus were respectively 789427±1139886, 1891432±1521385 y 5296615±3806640.
The correlation obtained between CCS and CE was respectively r=0.41 (P<0.0001) and r=0.12 (P<0,03). The CCS had significative (p<0.0001) correlations of r=0.86 with VMYP, r=0.64 with CMT, r=0.24 with CE and 0.47 with PortaSCC. The VMYP cell counts was 20.8% lesser than Breed counts. CCS averages were for the CMT scores of 326823 (0), 494294 (traces), 741670 (1), 1680557 (2) and 3842440 (3) cells/ml. S and SP were of
70% and 79% for CCS, 68% and 80% for CMT and 58% y 60% for CE respectively. The study shows that both the CCS (cut line <1000000) and CMT (0, T, 1) can be used to monitor the presence of subclinical mastitis, considering that exhibit good high negative VP (98% ) and good SP for the diagnosis of healthy udders and acceptable S for infections (specially major pathogens), provided that the bacteriological diagnosis, recurrence
of diagnosis and other no infectious factors associated to elevated CCS are taken into account.
Keywords: subclinical mastitis, dairy goat, aetiology, diagnostic test.

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