Alejandro Larriestra - Academia.edu (original) (raw)

Papers by Alejandro Larriestra

Research paper thumbnail of Field Trials of a Vaccine Against Bovine Mastitis. 2. Evaluation in Two Commercial Dairy Herds

Journal of Dairy Science, May 1, 1997

... 1 , 2 , a , José A. Giraudo 3 , a , Horacio Rampone 1 , a , Liliana Odierno 1 , a , Ana T. Gi... more ... 1 , 2 , a , José A. Giraudo 3 , a , Horacio Rampone 1 , a , Liliana Odierno 1 , a , Ana T. Giraudo 1 , a , Cecilia Frigerio 1 , a , Susana Bettera 1 , a , Claudia Raspanti 1 , a , Jorge Hernández 4 , a , Mónica Wehbe 4 , a , Miguel Mattea 5 , a , Miriam Ferrari 5 , a , Alejandro Larriestra 3 ...

Research paper thumbnail of Calidad microbiológica del agua utilizada en establecimientos lecheros de la zona de Villa María (Córdoba) Microbiological quality of the water used in a random sample from dairy farms in Córdoba, Argentina

DOAJ (DOAJ: Directory of Open Access Journals), Jun 1, 2011

Se evaluó la calidad bacteriológica del agua de pozo y del agua de lavado en una muestra aleatori... more Se evaluó la calidad bacteriológica del agua de pozo y del agua de lavado en una muestra aleatoria de 50 tambos distribuidos en la cuenca lechera de Villa María (Córdoba), Argentina. La visita a los tambos se realizó en 2007. Un 46 % y un 24 % de los tambos presentaron recuentos de aerobios mesófilos superiores a 500 UFC/ml en el agua de lavado y en el agua de pozo, respectivamente. En un 20 % de los establecimientos se aisló Escherichia coli de ambas fuentes de agua. Pseudomonas aeruginosa registró una alta frecuencia de aislamiento en el agua de pozo (36 %) y en la de lavado (42 %). Un 80 % y un 88 % de los establecimientos contaban con agua de pozo y de lavado no aptas, respectivamente. Los niveles de mesófilos aerobios y de coliformes totales presentes en el agua de pozo mostraron una concordancia moderada con los detectados en el agua destinada al lavado. En virtud de estos resultados, puede afirmarse que un elevado porcentaje de los tambos ubicados en la cuenca lechera de Villa María emplean agua de calidad bacteriológica deficiente, no apta para el ordeño ni el lavado de las instalaciones. Palabras clave: agua de lavado, agua de pozo, contaminación bacteriológica, calidad de agua Microbiological quality of the water used in a random sample from dairy farms in Córdoba, Argentina. Bacteriological contamination of well water and wash water in a random sample obtained from 50 farms from Villa María (Córdoba) dairy area, Argentina, was evaluated during a visit in 2007. Forty six percent and 24 % of farms showed an aerobic mesophilic bacteria count higher than 500 CFU/ml in wash water and well water, respectively. Escherichia coli was isolated in 20 % of samples from both sources. Pseudomonas aeruginosa showed high frequency of isolation in well water (36 %) and wash water (42 %). Eighty and eighty-eight percent of dairy farms have contaminated well water and wash water, respectively. The findings show moderate concordance between contamination of well water and wash water for mesophilic aerobics and total coliforms. The results reveal that a high percentage of dairy farms in the basin under study have poor bacteriological water quality, not suitable for milking and washing facilities.

Research paper thumbnail of The Economic Evaluation of Mastitis Control Strategies in Holstein-Friesian Dairy Herds

Animals, May 20, 2023

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Research paper thumbnail of Patterns of mortality in grow-finish pigs

Research paper thumbnail of Monitoring slaughter data and performance of finishing pigs as a tool for quality improvement in pork production

Research paper thumbnail of 1239 Sources of variation in dry matter content and particle size distribution in total mixed rations in dairy farms in Argentina

Journal of Animal Science, Oct 1, 2016

Research paper thumbnail of A decision-making framework for evaluating interventions used at weaning to reduce mortality in lightweight pigs and improve weight gains in the nursery

A decision model to aid in selecting treatments for weaned pigs was developed and tested, with th... more A decision model to aid in selecting treatments for weaned pigs was developed and tested, with the purpose of reducing nursery mortality and improving weight gain. Interventions evaluated were to not treat pigs, to treat the whole population, or to treat only a subgroup of pigs below a certain weaning weight (target treatment). Outcome was characterized as death or survival. Losses were set at zero for survivors weighing > 14.5 kg at the end of the nursery phase. Survivors weighing ≤ 14.5 were defined as lightweight pigs (LWP). Losses due to LWP and death were modeled as 30% and 60%, respectively, of the feeder pig market price (1974 to 2002 average, United States Department of Agriculture). Treatment effect, mortality, proportion of LWP, and treatment cost were subjected to sensitivity analysis. Losses were minimal for mortality < 7% and LWP < 18% when target treatment was used with different weaning weight cutoffs. Treating the whole population was economically efficient (mortality and LWP were at least 40% lower) if performance was poor. Each course of action evaluated may minimize losses. However, target treatment minimizes losses for a wide range of mortality, proportion of LWP, and treatment-cost situations.

Research paper thumbnail of Observations and description of an intervention method affecting death loss rate in all in/all out finishers

Research paper thumbnail of Ichthyopathological study in wild populations of the central-south region of the province of Córdoba, Argentina

Research paper thumbnail of Prevalence of Cryptosporidium spp. and Giardia spp., spatial clustering and patterns of shedding in dairy calves from Córdoba, Argentina

Revista Brasileira De Parasitologia Veterinaria, Jun 1, 2011

Prevalência de Cryptosporidium spp. e Giardia spp., distribuição espacial e padrões de eliminação... more Prevalência de Cryptosporidium spp. e Giardia spp., distribuição espacial e padrões de eliminação em bezerros de propriedades leiteiras em Córdoba, Argentina

Research paper thumbnail of 1224 A model to estimate losses due to bovine mastitis for Argentinian dairy herds

Journal of Animal Science, Oct 1, 2016

prevailed over economic criteria; while the technical support had marginal influence in the decis... more prevailed over economic criteria; while the technical support had marginal influence in the decision (Table 1). An inverse relationship between cost and utility was found, which means that less costly intervention is preferred. In contrast, we found a direct relationship between efficacy and utility.

Research paper thumbnail of Risk Factors for Mortality in Grow-finishing Pigs in Belgium

Journal of Veterinary Medicine Series B-infectious Diseases and Veterinary Public Health, Sep 1, 2004

The present study investigated risk factors for mortality in grow-finishing pigs of 137 pig herds... more The present study investigated risk factors for mortality in grow-finishing pigs of 137 pig herds belonging to one integration company during a period of 2.5 years. Mortality data, expressed as the number of dead pigs divided by the number of pigs placed in the fattening unit were investigated retrospectively. The following potential risk factors were evaluated: type of pig herd, season and year of placement in the fattening unit, pig density in the municipality, management practices (density of the pigs in the barn, origin of the pigs), housing conditions and feeding practices. The overall average mortality percentage was 4.70%. Three variables in a multivariable regression model were significantly associated with mortality: season of placement in the fattening unit, origin of the piglets and duration of the fattening period. Pigs placed in October, November and December, were at higher risk than pigs placed in other months. Herds that purchased pigs from a merchant, used pigs from other herds with an excess of piglets for filling their fattening units or herds that purchased pigs from more than five origin herds also suffered higher mortality. The mortality also increased in case of longer duration of the fattening period. This study documented for the first time that in addition to seasonal effects and a longer duration of the fattening period, purchasing feeder pigs from one or a limited number of herds is of crucial importance to achieve low mortality in the grow-finishing pigs.

Research paper thumbnail of Using AST and RFID to reduce and understand variation in growing pigs

Research paper thumbnail of What does clustering in nursery mortality frequencies mean

Research paper thumbnail of Characterizing Subpopulations to Reduce Attrition

Records can be used in the number of ways. Most often records are used at upper levels of managem... more Records can be used in the number of ways. Most often records are used at upper levels of management, often to make economic decisions or to monitor the progress of the farm in meeting its targets. Unfortunately, such methods of using records have resulted in a type ...

Research paper thumbnail of Pig characteristics associated with mortality and light exit weight for the nursery phase

PubMed, Jun 1, 2006

One thousand and ten weaned pigs that were reared in 1 nursery in Iowa from weaning (17 +/- 2 day... more One thousand and ten weaned pigs that were reared in 1 nursery in Iowa from weaning (17 +/- 2 days ) until 10 weeks of age were evaluated. A weaning weight threshold of 3.6 kg maximized the sensitivity and specificity to correctly predict the likelihood of dying or being light in weight at exit from the nursery (< or = 14.5 kg). Weaning weight < or = 3.6 kg (OR = 2.92), barrow (OR = 1.75), and sow unit (A versus B, OR = 2.14) were significant predictors of mortality in the nursery. Birth weight < or = 1.0 kg (OR = 2.66), weaning weight < or = 3.6 kg (OR = 8.75), gilt (OR = 1.4), sow unit (OR = 2.38), and gilt as nursing sow at weaning (OR = 1.66) were significant predictors of being lightweight at nursery exit. Eighteen per cent of the nursery deaths and almost half of lightweight nursery pigs could be prevented if there were no lightweight pigs at weaning.

Research paper thumbnail of Knowledge and attitudes towards food safety and reported use of good production practices among a sample of cattle producers in Santa Fe, Argentina # Conocimiento y actitudes hacia seguridad alimentaria y buenas prácticas de producción adoptadas en productores ganaderos de Santa Fe, Argentina

RESUMEN La implementación de buenas prácticas de producción (BPP) en establecimientos pecuarios y... more RESUMEN La implementación de buenas prácticas de producción (BPP) en establecimientos pecuarios y la traducción efectiva de conocimiento sobre inocuidad de los alimentos a productores agropecuarios se recomienda para un suministro de alimentos más seguros. Un estudio piloto fue realizado durante 2009-2010 para evaluar el conocimiento y las actitudes hacia la inocuidad de los alimentos y el uso de BPP entre 930 ganaderos en Santa Fe, Argentina. El porcentaje de respuestas de las encuestas fue 31,8% (n = 296). Varios encuestados indicaron que raramente o nunca aislaban al ganado enfermo (25,8%), mantenían registros de enfermedades (32,5%) o del uso de antibióticos (43,3%), y aseguraban que los visitantes y los empleados del establecimiento se lavaran las manos (79,2% y 31,2%) y usaran ropa de protección (79,0% y 31,3%). La mediana de las respuestas de las 13 BPP encuestadas fue evaluada en un modelo ordinal de regresión logística. Capacitación previa sobre inocuidad de los alimentos (OR = 2,59), discusión frecuente (OR = 5,89) o siempre (OR = 6,33) de inocuidad de los alimentos con el veterinario, y ser productor de leche comparado a un productor de cría (OR = 3,86) fueron asociados con un mejor uso de BPP. Un 40% de la variación total en el uso de BPP se debió a factores relacionados a veterinarios, indicando que deberían tener un papel importante en la educación de los productores ganaderos sobre inocuidad de los alimentos. Estos resultados iniciales se deben utilizar para apoyar la toma de decisiones sobre la inocuidad de los alimentos en la producción de ganado en Santa Fe.

Research paper thumbnail of Pre-existing conditions as predictors of mortality and slow growth in nursery pigs

Research paper thumbnail of PorKHEALTH" - AN EPIDEMIOLOGICAL TOOL FOR IMPLEMENTING PRE-HARVEST FOOD SAFETY AND QUALITY ASSURANCE INTO THE PORK CHAIN

Slaughter checks have been used as an indicator of herd health in pigs for almost three decades. ... more Slaughter checks have been used as an indicator of herd health in pigs for almost three decades. The first internationally recognized publications came from Scandinavia in the 70’s of the last century. Ever since, countless reports have been published mainly on the use of slaughter checks to answer specific questions such as the economic impact of pneumonia or the efficacy of vaccination or treatment programs. In the 80’s and early 90’s, Denmark (1), The Netherlands (2), and several regional programs in other countries, e.g. the Canadian APHIN program on Prince Edward Island (3), started to use slaughter checks on a routine basis as ongoing monitoring. These programs have been focusing so far mainly on the health, efficiency, and productivity of the supplying swine herds. In the mid 90’s, slaughter check programs became gradually one of the tools of quality assurance systems, e.g. in The Netherlands (4) and in Germany (5). The PigMON program, developed in Australia (6) and adopted t...

Research paper thumbnail of Mastitis en vacas Holstein y factores asociados en tambos de Córdoba, Argentina

Revista Veterinaria, 2021

El objetivo de este trabajo fue estimar la incidencia de mastitis clínica (MC) en tambos e identi... more El objetivo de este trabajo fue estimar la incidencia de mastitis clínica (MC) en tambos e identificar factores individuales asociados a nuevos episodios. Nueve tambos del tipo semipastoril que aplicaban medidas de control y prevención de la mastitis, fueron incluidos y visitados dos veces con un intervalo de 15 días. Una muestra aleatoria de vacas fue seleccionada en la primera visita y monitoreada durante los 15 días posteriores para la identificación de los nuevos casos de MC. La incidencia fue determinada como el cociente entre el número de casos nuevos de MC durante el período de seguimiento y el número de vacas sanas en la primera visita. Los factores de riesgo evaluados a nivel de vaca fueron: suciedad de la ubre, distancia al piso de la punta del pezón anterior, número ordinal de partos y días en lactancia. A nivel de cuarto se evaluó la presencia de pérdida espontánea de leche, condición del pezón considerando estado de la piel, presencia de anillo e hiperqueratosis. El gra...

Research paper thumbnail of Field Trials of a Vaccine Against Bovine Mastitis. 2. Evaluation in Two Commercial Dairy Herds

Journal of Dairy Science, May 1, 1997

... 1 , 2 , a , José A. Giraudo 3 , a , Horacio Rampone 1 , a , Liliana Odierno 1 , a , Ana T. Gi... more ... 1 , 2 , a , José A. Giraudo 3 , a , Horacio Rampone 1 , a , Liliana Odierno 1 , a , Ana T. Giraudo 1 , a , Cecilia Frigerio 1 , a , Susana Bettera 1 , a , Claudia Raspanti 1 , a , Jorge Hernández 4 , a , Mónica Wehbe 4 , a , Miguel Mattea 5 , a , Miriam Ferrari 5 , a , Alejandro Larriestra 3 ...

Research paper thumbnail of Calidad microbiológica del agua utilizada en establecimientos lecheros de la zona de Villa María (Córdoba) Microbiological quality of the water used in a random sample from dairy farms in Córdoba, Argentina

DOAJ (DOAJ: Directory of Open Access Journals), Jun 1, 2011

Se evaluó la calidad bacteriológica del agua de pozo y del agua de lavado en una muestra aleatori... more Se evaluó la calidad bacteriológica del agua de pozo y del agua de lavado en una muestra aleatoria de 50 tambos distribuidos en la cuenca lechera de Villa María (Córdoba), Argentina. La visita a los tambos se realizó en 2007. Un 46 % y un 24 % de los tambos presentaron recuentos de aerobios mesófilos superiores a 500 UFC/ml en el agua de lavado y en el agua de pozo, respectivamente. En un 20 % de los establecimientos se aisló Escherichia coli de ambas fuentes de agua. Pseudomonas aeruginosa registró una alta frecuencia de aislamiento en el agua de pozo (36 %) y en la de lavado (42 %). Un 80 % y un 88 % de los establecimientos contaban con agua de pozo y de lavado no aptas, respectivamente. Los niveles de mesófilos aerobios y de coliformes totales presentes en el agua de pozo mostraron una concordancia moderada con los detectados en el agua destinada al lavado. En virtud de estos resultados, puede afirmarse que un elevado porcentaje de los tambos ubicados en la cuenca lechera de Villa María emplean agua de calidad bacteriológica deficiente, no apta para el ordeño ni el lavado de las instalaciones. Palabras clave: agua de lavado, agua de pozo, contaminación bacteriológica, calidad de agua Microbiological quality of the water used in a random sample from dairy farms in Córdoba, Argentina. Bacteriological contamination of well water and wash water in a random sample obtained from 50 farms from Villa María (Córdoba) dairy area, Argentina, was evaluated during a visit in 2007. Forty six percent and 24 % of farms showed an aerobic mesophilic bacteria count higher than 500 CFU/ml in wash water and well water, respectively. Escherichia coli was isolated in 20 % of samples from both sources. Pseudomonas aeruginosa showed high frequency of isolation in well water (36 %) and wash water (42 %). Eighty and eighty-eight percent of dairy farms have contaminated well water and wash water, respectively. The findings show moderate concordance between contamination of well water and wash water for mesophilic aerobics and total coliforms. The results reveal that a high percentage of dairy farms in the basin under study have poor bacteriological water quality, not suitable for milking and washing facilities.

Research paper thumbnail of The Economic Evaluation of Mastitis Control Strategies in Holstein-Friesian Dairy Herds

Animals, May 20, 2023

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Research paper thumbnail of Patterns of mortality in grow-finish pigs

Research paper thumbnail of Monitoring slaughter data and performance of finishing pigs as a tool for quality improvement in pork production

Research paper thumbnail of 1239 Sources of variation in dry matter content and particle size distribution in total mixed rations in dairy farms in Argentina

Journal of Animal Science, Oct 1, 2016

Research paper thumbnail of A decision-making framework for evaluating interventions used at weaning to reduce mortality in lightweight pigs and improve weight gains in the nursery

A decision model to aid in selecting treatments for weaned pigs was developed and tested, with th... more A decision model to aid in selecting treatments for weaned pigs was developed and tested, with the purpose of reducing nursery mortality and improving weight gain. Interventions evaluated were to not treat pigs, to treat the whole population, or to treat only a subgroup of pigs below a certain weaning weight (target treatment). Outcome was characterized as death or survival. Losses were set at zero for survivors weighing > 14.5 kg at the end of the nursery phase. Survivors weighing ≤ 14.5 were defined as lightweight pigs (LWP). Losses due to LWP and death were modeled as 30% and 60%, respectively, of the feeder pig market price (1974 to 2002 average, United States Department of Agriculture). Treatment effect, mortality, proportion of LWP, and treatment cost were subjected to sensitivity analysis. Losses were minimal for mortality < 7% and LWP < 18% when target treatment was used with different weaning weight cutoffs. Treating the whole population was economically efficient (mortality and LWP were at least 40% lower) if performance was poor. Each course of action evaluated may minimize losses. However, target treatment minimizes losses for a wide range of mortality, proportion of LWP, and treatment-cost situations.

Research paper thumbnail of Observations and description of an intervention method affecting death loss rate in all in/all out finishers

Research paper thumbnail of Ichthyopathological study in wild populations of the central-south region of the province of Córdoba, Argentina

Research paper thumbnail of Prevalence of Cryptosporidium spp. and Giardia spp., spatial clustering and patterns of shedding in dairy calves from Córdoba, Argentina

Revista Brasileira De Parasitologia Veterinaria, Jun 1, 2011

Prevalência de Cryptosporidium spp. e Giardia spp., distribuição espacial e padrões de eliminação... more Prevalência de Cryptosporidium spp. e Giardia spp., distribuição espacial e padrões de eliminação em bezerros de propriedades leiteiras em Córdoba, Argentina

Research paper thumbnail of 1224 A model to estimate losses due to bovine mastitis for Argentinian dairy herds

Journal of Animal Science, Oct 1, 2016

prevailed over economic criteria; while the technical support had marginal influence in the decis... more prevailed over economic criteria; while the technical support had marginal influence in the decision (Table 1). An inverse relationship between cost and utility was found, which means that less costly intervention is preferred. In contrast, we found a direct relationship between efficacy and utility.

Research paper thumbnail of Risk Factors for Mortality in Grow-finishing Pigs in Belgium

Journal of Veterinary Medicine Series B-infectious Diseases and Veterinary Public Health, Sep 1, 2004

The present study investigated risk factors for mortality in grow-finishing pigs of 137 pig herds... more The present study investigated risk factors for mortality in grow-finishing pigs of 137 pig herds belonging to one integration company during a period of 2.5 years. Mortality data, expressed as the number of dead pigs divided by the number of pigs placed in the fattening unit were investigated retrospectively. The following potential risk factors were evaluated: type of pig herd, season and year of placement in the fattening unit, pig density in the municipality, management practices (density of the pigs in the barn, origin of the pigs), housing conditions and feeding practices. The overall average mortality percentage was 4.70%. Three variables in a multivariable regression model were significantly associated with mortality: season of placement in the fattening unit, origin of the piglets and duration of the fattening period. Pigs placed in October, November and December, were at higher risk than pigs placed in other months. Herds that purchased pigs from a merchant, used pigs from other herds with an excess of piglets for filling their fattening units or herds that purchased pigs from more than five origin herds also suffered higher mortality. The mortality also increased in case of longer duration of the fattening period. This study documented for the first time that in addition to seasonal effects and a longer duration of the fattening period, purchasing feeder pigs from one or a limited number of herds is of crucial importance to achieve low mortality in the grow-finishing pigs.

Research paper thumbnail of Using AST and RFID to reduce and understand variation in growing pigs

Research paper thumbnail of What does clustering in nursery mortality frequencies mean

Research paper thumbnail of Characterizing Subpopulations to Reduce Attrition

Records can be used in the number of ways. Most often records are used at upper levels of managem... more Records can be used in the number of ways. Most often records are used at upper levels of management, often to make economic decisions or to monitor the progress of the farm in meeting its targets. Unfortunately, such methods of using records have resulted in a type ...

Research paper thumbnail of Pig characteristics associated with mortality and light exit weight for the nursery phase

PubMed, Jun 1, 2006

One thousand and ten weaned pigs that were reared in 1 nursery in Iowa from weaning (17 +/- 2 day... more One thousand and ten weaned pigs that were reared in 1 nursery in Iowa from weaning (17 +/- 2 days ) until 10 weeks of age were evaluated. A weaning weight threshold of 3.6 kg maximized the sensitivity and specificity to correctly predict the likelihood of dying or being light in weight at exit from the nursery (< or = 14.5 kg). Weaning weight < or = 3.6 kg (OR = 2.92), barrow (OR = 1.75), and sow unit (A versus B, OR = 2.14) were significant predictors of mortality in the nursery. Birth weight < or = 1.0 kg (OR = 2.66), weaning weight < or = 3.6 kg (OR = 8.75), gilt (OR = 1.4), sow unit (OR = 2.38), and gilt as nursing sow at weaning (OR = 1.66) were significant predictors of being lightweight at nursery exit. Eighteen per cent of the nursery deaths and almost half of lightweight nursery pigs could be prevented if there were no lightweight pigs at weaning.

Research paper thumbnail of Knowledge and attitudes towards food safety and reported use of good production practices among a sample of cattle producers in Santa Fe, Argentina # Conocimiento y actitudes hacia seguridad alimentaria y buenas prácticas de producción adoptadas en productores ganaderos de Santa Fe, Argentina

RESUMEN La implementación de buenas prácticas de producción (BPP) en establecimientos pecuarios y... more RESUMEN La implementación de buenas prácticas de producción (BPP) en establecimientos pecuarios y la traducción efectiva de conocimiento sobre inocuidad de los alimentos a productores agropecuarios se recomienda para un suministro de alimentos más seguros. Un estudio piloto fue realizado durante 2009-2010 para evaluar el conocimiento y las actitudes hacia la inocuidad de los alimentos y el uso de BPP entre 930 ganaderos en Santa Fe, Argentina. El porcentaje de respuestas de las encuestas fue 31,8% (n = 296). Varios encuestados indicaron que raramente o nunca aislaban al ganado enfermo (25,8%), mantenían registros de enfermedades (32,5%) o del uso de antibióticos (43,3%), y aseguraban que los visitantes y los empleados del establecimiento se lavaran las manos (79,2% y 31,2%) y usaran ropa de protección (79,0% y 31,3%). La mediana de las respuestas de las 13 BPP encuestadas fue evaluada en un modelo ordinal de regresión logística. Capacitación previa sobre inocuidad de los alimentos (OR = 2,59), discusión frecuente (OR = 5,89) o siempre (OR = 6,33) de inocuidad de los alimentos con el veterinario, y ser productor de leche comparado a un productor de cría (OR = 3,86) fueron asociados con un mejor uso de BPP. Un 40% de la variación total en el uso de BPP se debió a factores relacionados a veterinarios, indicando que deberían tener un papel importante en la educación de los productores ganaderos sobre inocuidad de los alimentos. Estos resultados iniciales se deben utilizar para apoyar la toma de decisiones sobre la inocuidad de los alimentos en la producción de ganado en Santa Fe.

Research paper thumbnail of Pre-existing conditions as predictors of mortality and slow growth in nursery pigs

Research paper thumbnail of PorKHEALTH" - AN EPIDEMIOLOGICAL TOOL FOR IMPLEMENTING PRE-HARVEST FOOD SAFETY AND QUALITY ASSURANCE INTO THE PORK CHAIN

Slaughter checks have been used as an indicator of herd health in pigs for almost three decades. ... more Slaughter checks have been used as an indicator of herd health in pigs for almost three decades. The first internationally recognized publications came from Scandinavia in the 70’s of the last century. Ever since, countless reports have been published mainly on the use of slaughter checks to answer specific questions such as the economic impact of pneumonia or the efficacy of vaccination or treatment programs. In the 80’s and early 90’s, Denmark (1), The Netherlands (2), and several regional programs in other countries, e.g. the Canadian APHIN program on Prince Edward Island (3), started to use slaughter checks on a routine basis as ongoing monitoring. These programs have been focusing so far mainly on the health, efficiency, and productivity of the supplying swine herds. In the mid 90’s, slaughter check programs became gradually one of the tools of quality assurance systems, e.g. in The Netherlands (4) and in Germany (5). The PigMON program, developed in Australia (6) and adopted t...

Research paper thumbnail of Mastitis en vacas Holstein y factores asociados en tambos de Córdoba, Argentina

Revista Veterinaria, 2021

El objetivo de este trabajo fue estimar la incidencia de mastitis clínica (MC) en tambos e identi... more El objetivo de este trabajo fue estimar la incidencia de mastitis clínica (MC) en tambos e identificar factores individuales asociados a nuevos episodios. Nueve tambos del tipo semipastoril que aplicaban medidas de control y prevención de la mastitis, fueron incluidos y visitados dos veces con un intervalo de 15 días. Una muestra aleatoria de vacas fue seleccionada en la primera visita y monitoreada durante los 15 días posteriores para la identificación de los nuevos casos de MC. La incidencia fue determinada como el cociente entre el número de casos nuevos de MC durante el período de seguimiento y el número de vacas sanas en la primera visita. Los factores de riesgo evaluados a nivel de vaca fueron: suciedad de la ubre, distancia al piso de la punta del pezón anterior, número ordinal de partos y días en lactancia. A nivel de cuarto se evaluó la presencia de pérdida espontánea de leche, condición del pezón considerando estado de la piel, presencia de anillo e hiperqueratosis. El gra...