Characterization of fungi from ruminal fluid of beef cattle with different ages and raised in tropical lignified pastures.

The objective of this study was to evaluate the aerobic rumen mycobiota from three age groups of Nelore beef cattle reared extensively on lignified pasture. The experiment was randomized and sampled 50 steers, 50 cows, and 50 calves grazed on Brachiaria spp. pasture during the dry season. Rumen fluid in all animals was aromatic, slightly viscous, and greenish-brown in color. Microscopic examination revealed monocentric and polycentric anaerobic fungi in similar proportions (P > 0.05) in the rumen fluid of cows and steers. However, these microorganisms were not identified in any of the samples from calves. In culture exams, aerobic filamentous population was significantly higher for rumen fluid of cows compared to the other two groups. Microculture and rDNA sequence analyses showed Aspergillus spp. as the most frequent aerobic fungus among the isolates from the three bovine groups evaluated. Biochemical profiles were determined by the growth level of yeast isolates with 44 nutrient sources. Ten different yeast profiles were obtained, and yeast isolates from cow ruminal fluid showed ability to catabolize greater diversity of carbon and nitrogen sources. The differences in the fungal populations observed in this study could be explained by microbial and physiological interactions existing in the ruminal ecosystem of each age bovine group. The present study showed the fungal population of the rumen related with differences among age of cattle raised in lignified pastures. Metabolic capabilities of mycelial fungi or yeast identified in this study may be employed in new probiotics or microbial additives for different bovine categories.

Notable fibrolytic enzyme production by Aspergillus spp. isolates from the gastrointestinal tract of beef cattle fed in lignified pastures.

Fungi have the ability to degrade vegetal cell wall carbohydrates, and their presence in the digestive tract of ruminants can minimize the effects of lignified forage on ruminal fermentation. Here, we evaluated enzyme production by Aspergillus spp. isolates from the digestive tracts of cattle grazed in tropical pastures during the dry season. Filamentous fungi were isolated from rumen and feces by culture in cellulose-based medium. Ninety fungal strains were isolated and identified by rDNA sequence analysis, microculture, or both. Aspergillus terreus was the most frequently isolated species, followed by Aspergillus fumigatus. The isolates were characterized with respect to their cellulolytic, xylanolytic, and lignolytic activity through qualitative evaluation in culture medium containing a specific corresponding carbon source. Carboxymethyl cellulase (CMCase) activity was quantified by the reducing sugar method. In the avicel and xilan degradation test, the enzyme activity (EA) at 48 h was significantly higher other periods (P < 0.05). Intra- and inter-specific differences in EA were verified, and high levels of phenoloxidases, which are crucial for lignin degradation, were observed in 28.9% of the isolates. Aspergillus terreus showed significantly higher EA for avicelase (3.96 ±1.77) and xylanase (3.13 ±.091) than the other Aspergillus species at 48 h of incubation. Isolates AT13 and AF69 showed the highest CMCase specific activity (54.84 and 33.03 U mg-1 protein, respectively). Selected Aspergillus spp. isolates produced remarkable levels of enzymes involved in vegetal cell wall degradation, suggesting their potential as antimicrobial additives or probiotics in ruminant diets.

Probiótico fúngico para ovinos confinados recebendo dieta de alto grão de milho / Fungal probiotic for feedlot sheep receiving high grain corn diet / Probiótico fungal para ovejas confinadas que reciben una dieta de maíz de grano alto

El objetivo fue evaluar los fungal ruminales como probióticos potenciales en asociación con dietas ricas en granos en el actuación y rendimiento de la canal y la acidosis en corderos Santa Inês/Dorper. Adoptó un diseño completamente aleatorizado en factorial 4x2, con dos procesos (granos de maíz molidos o integral) y cuatro inoculantes (sin inóculo, con Rhizomucor spp., con Aspergillus terreus y con una mezcla de los dos hongos). Durante 75 días se utilizaron ocho establos con cinco corderos/puesto. Las dietas con 85% de maíz asociado con 15% de núcleo granos se proporcionaron ad libitum dos veces al día, con inoculantes rociados sobre el alimento. Durante la prueba se realizaron cinco recoleccion es de muestras de los ingredientes de las dietas y sobras para realizar los análisis centesimales. Los animales se pesaron cada das semanas para evaluar los índices de rendimiento. Al final de la prueba, en el momento del sacrificio, se calcularon los rendimientos en canal de cinco animales por tratamiento. Los datos se sometieron a análisis de variación y las medias de los datos se compararon mediante la prueba de Tukey al 5%. No hubo interacción entre los factores de procesamiento y probióticos para las variables de desempeño (P > 0,05), así como tampoco hubo efecto de agregar los probióticos sobre el desempeño de las ovejas alimentadas con los diferentes tratamientos...

The objective of this study was to evaluate ruminal fungi as potential probiotics in association with high-grain diets in carcass performance and yield, and acidosis in Santa Inês/Dorper lambs. A 4x2 factorial was adopted in CRD, with two processes (ground or whole grain) and four inoculants (without inoculants, with Rhizomucor spp., With Aspergillus terreus and with a mixture of fungi). Eight stalls with five lambs/stall were used for 75 days. Diets with 85 % corn plus 15 % nucleus are provided twice a day, with inoculants sprayed at the time of food handling. Five collections of ingredients of the ingredients of the diets, diets and leftovers were carried out during the experiment. The animals were weighed every two weeks. At the end of the experiment, on slaughter, the carcass index of five animals/treatment was calculated. Data were submitted to ANOVA and the data averages compared by the Tukey test at 5 %. There was no interaction between the processing and probiotic factors for the performance variables (P > 0.05), just as there was no effect of the addition of probiotics on the performance of the sheep fed with the different treatments (P > 0.05). Higher consumption of DM, MM, EE, NDF and NFC was observed for animals fed with whole grain corn (MGI) (P 0.05) for the consumption of OM, CP, MDG...

Objetivou-se avaliar fungos ruminais como potenciais probióticos em associação a dietas de alto grão no desempenho e rendimento de carcaça, e quadro de acidose em borregos Santa Inês/Dorper. Adotou-se fatorial 4x2 em DIC, sendo dois processamentos (grão moído ou inteiro) e quatro inoculantes (sem inóculos, com Rhizomucor spp., com Aspergillus terreus e com mistura dos dois fungos). Utilizou-se oito baias com cinco borregos/baia, durante 75 dias. Dietas com 85% de milho associadas à 15% de núcleo foram fornecidas ad libitum duas vezes ao dia, com inóculos aspergidos no arraçoamento. Realizou-se cinco coletas de amostras dos ingredientes das dietas e das sobras durante o ensaio para realização das análises centesimais. Pesou-se os animais quinzenalmente para avaliação dos índices de desempenho. Ao final do ensaio, na ocasião do abate, foram calculados os rendimentos de carcaça de cinco animais por tratamento. Os dados foram submetidos à ANOVA e as médias dos dados comparadas pelo teste de Tukey a 5 %. Não houve interação entre os fatores processamento e probióticos para as variáveis de desempenho (P > 0.05), assim como, não houve efeito da adição dos probióticos sobre o desempenho dos ovinos alimentados com os diferentes tratamentos (P > 0.05). Foi observado maior consumo de MS, MM, EE, FDN e CNF para os animais alimentados com milho grão inteiro (MGI)...

Probiótico fúngico para ovinos confinados recebendo dieta de alto grão de milho / Fungal probiotic for feedlot sheep receiving high grain corn diet / Probiótico fungal para ovejas confinadas que reciben una dieta de maíz de grano alto

El objetivo fue evaluar los fungal ruminales como probióticos potenciales en asociación con dietas ricas en granos en el actuación y rendimiento de la canal y la acidosis en corderos Santa Inês/Dorper. Adoptó un diseño completamente aleatorizado en factorial 4x2, con dos procesos (granos de maíz molidos o integral) y cuatro inoculantes (sin inóculo, con Rhizomucor spp., con Aspergillus terreus y con una mezcla de los dos hongos). Durante 75 días se utilizaron ocho establos con cinco corderos/puesto. Las dietas con 85% de maíz asociado con 15% de núcleo granos se proporcionaron ad libitum dos veces al día, con inoculantes rociados sobre el alimento. Durante la prueba se realizaron cinco recoleccion es de muestras de los ingredientes de las dietas y sobras para realizar los análisis centesimales. Los animales se pesaron cada das semanas para evaluar los índices de rendimiento. Al final de la prueba, en el momento del sacrificio, se calcularon los rendimientos en canal de cinco animales por tratamiento. Los datos se sometieron a análisis de variación y las medias de los datos se compararon mediante la prueba de Tukey al 5%. No hubo interacción entre los factores de procesamiento y probióticos para las variables de desempeño (P > 0,05), así como tampoco hubo efecto de agregar los probióticos sobre el desempeño de las ovejas alimentadas con los diferentes tratamientos...(AU)

The objective of this study was to evaluate ruminal fungi as potential probiotics in association with high-grain diets in carcass performance and yield, and acidosis in Santa Inês/Dorper lambs. A 4x2 factorial was adopted in CRD, with two processes (ground or whole grain) and four inoculants (without inoculants, with Rhizomucor spp., With Aspergillus terreus and with a mixture of fungi). Eight stalls with five lambs/stall were used for 75 days. Diets with 85 % corn plus 15 % nucleus are provided twice a day, with inoculants sprayed at the time of food handling. Five collections of ingredients of the ingredients of the diets, diets and leftovers were carried out during the experiment. The animals were weighed every two weeks. At the end of the experiment, on slaughter, the carcass index of five animals/treatment was calculated. Data were submitted to ANOVA and the data averages compared by the Tukey test at 5 %. There was no interaction between the processing and probiotic factors for the performance variables (P > 0.05), just as there was no effect of the addition of probiotics on the performance of the sheep fed with the different treatments (P > 0.05). Higher consumption of DM, MM, EE, NDF and NFC was observed for animals fed with whole grain corn (MGI) (P < 0.05). There was no significant difference (P > 0.05) for the consumption of OM, CP, MDG...(AU)

Objetivou-se avaliar fungos ruminais como potenciais probióticos em associação a dietas de alto grão no desempenho e rendimento de carcaça, e quadro de acidose em borregos Santa Inês/Dorper. Adotou-se fatorial 4x2 em DIC, sendo dois processamentos (grão moído ou inteiro) e quatro inoculantes (sem inóculos, com Rhizomucor spp., com Aspergillus terreus e com mistura dos dois fungos). Utilizou-se oito baias com cinco borregos/baia, durante 75 dias. Dietas com 85% de milho associadas à 15% de núcleo foram fornecidas ad libitum duas vezes ao dia, com inóculos aspergidos no arraçoamento. Realizou-se cinco coletas de amostras dos ingredientes das dietas e das sobras durante o ensaio para realização das análises centesimais. Pesou-se os animais quinzenalmente para avaliação dos índices de desempenho. Ao final do ensaio, na ocasião do abate, foram calculados os rendimentos de carcaça de cinco animais por tratamento. Os dados foram submetidos à ANOVA e as médias dos dados comparadas pelo teste de Tukey a 5 %. Não houve interação entre os fatores processamento e probióticos para as variáveis de desempenho (P > 0.05), assim como, não houve efeito da adição dos probióticos sobre o desempenho dos ovinos alimentados com os diferentes tratamentos (P > 0.05). Foi observado maior consumo de MS, MM, EE, FDN e CNF para os animais alimentados com milho grão inteiro (MGI)...(AU)

Protozoários ruminais de novilhos de corte criados em pastagem tropical durante o período seco / Rumen protozoa of steers raised on tropical pasture during dry season

Protozoa of the rumen can represent 40% of total nitrogen and 60% of the final product of fermentation and it has cellulolytic activity. This study aimed to quantify and identify the ruminal protozoa populations from steers, raised exclusively on pastures during the dry season in the north of Minas Gerais, Brazil. Samples of ruminal fluid of 36 Nellore steers were collected directly from the rumen immediately after slaughter, during the early, middle or end of the dry season. For protozoa conservation, 1 mL of ruminal fluid was diluted in 9 mL of 10 % formaldehydes solution. Decimal dilutions were made in saline and the counting of small, medium and large protozoa was performed in Sedgewick Rafter chamber. The protozoa concentrations were transformed into log10 (x +1), subjected to variance analysis and the means were compared with Duncan test. The genus frequencies were compared with chi-square test. The concentration average of the total and of small and medium protozoa declined significantly over the course of the dry season; however, alterations in large protozoa concentrations were not detected over the three periods evaluated. A total of 7749 protozoa were identified, belonging to 17 different genera. Charonina spp. and Entodinium spp. had the highest occurrence during the three periods of dry season (P 0.05), suggesting the participation of these ciliates in rumen cattle fed exclusively on tropical pasture during this season.(AU)

Protozoários do rúmen podem representar 40% do nitrogênio total e 60% do produto final da fermentação e apresentam atividade celulolítica. Neste estudo, objetivou-se quantificar e identificar as populações de protozoários no rúmen de novilhos, criados exclusivamente em pastagem, durante o período seco do ano, no Norte de Minas Gerais. Amostras do suco ruminal de 36 novilhos mestiços Nelore foram coletadas diretamente do rúmen, após o abate, durante o inicio, meio ou fim do período de estiagem. Para conservação dos protozoários, 1 mL do suco ruminal foi diluído em 9 mL de solução de formaldeido a 10%. Posteriormente, foram realizadas diluições decimais em solução salina e contagem de protozoários pequenos, médios e grandes em câmara de Sedgewick Rafter. As concentrações de protozoários foram transformadas em log10 (x+1) e submetidas à análise de variância e as médias comparadas com teste de Duncan. As frequências dos gêneros foram comparadas com o teste do qui-quadrado. As médias da concentração total e de pequenos e médios protozoários diminuíram significativamente com o decorrer do período seco; entretanto, os grandes protozoários não apresentaram alterações na concentração média durante os três períodos avaliados. Foram identificados 7749 protozoários, pertencentes a 17 gêneros diferentes. Observou-se que os gêneros Charonina e Entodinium apresentaram alta ocorrência no início, meio e final do período da seca (p<0,05), indicando a participação desses ciliados em bovinos alimentados exclusivamente a pasto, durante esse período do ano. (AU)

Protozoários ruminais de novilhos de corte criados em pastagem tropical durante o período seco

Protozoa of the rumen can represent 40% of total nitrogen and 60% of the final product of fermentation and it has cellulolytic activity. This study aimed to quantify and identify the ruminal protozoa populations from steers, raised exclusively on pastures during the dry season in the north of Minas Gerais, Brazil. Samples of ruminal fluid of 36 Nellore steers were collected directly from the rumen immediately after slaughter, during the early, middle or end of the dry season. For protozoa conservation, 1 mL of ruminal fluid was diluted in 9 mL of 10 % formaldehydes solution. Decimal dilutions were made in saline and the counting of small, medium and large protozoa was performed in Sedgewick Rafter chamber. The protozoa concentrations were transformed into log10 (x +1), subjected to variance analysis and the means were compared with Duncan test. The genus frequencies were compared with chi-square test. The concentration average of the total and of small and medium protozoa declined significantly over the course of the dry season; however, alterations in large protozoa concentrations were not detected over the three periods evaluated. A total of 7749 protozoa were identified, belonging to 17 different genera. Charonina spp. and Entodinium spp. had the highest occurrence during the three periods of dry season (P 0.05), suggesting the participation of these ciliates in rumen cattle fed exclusively on tropical pasture during this season.

Protozoários do rúmen podem representar 40% do nitrogênio total e 60% do produto final da fermentação e apresentam atividade celulolítica. Neste estudo, objetivou-se quantificar e identificar as populações de protozoários no rúmen de novilhos, criados exclusivamente em pastagem, durante o período seco do ano, no Norte de Minas Gerais. Amostras do suco ruminal de 36 novilhos mestiços Nelore foram coletadas diretamente do rúmen, após o abate, durante o inicio, meio ou fim do período de estiagem. Para conservação dos protozoários, 1 mL do suco ruminal foi diluído em 9 mL de solução de formaldeido a 10%. Posteriormente, foram realizadas diluições decimais em solução salina e contagem de protozoários pequenos, médios e grandes em câmara de Sedgewick Rafter. As concentrações de protozoários foram transformadas em log10 (x+1) e submetidas à análise de variância e as médias comparadas com teste de Duncan. As frequências dos gêneros foram comparadas com o teste do qui-quadrado. As médias da concentração total e de pequenos e médios protozoários diminuíram significativamente com o decorrer do período seco; entretanto, os grandes protozoários não apresentaram alterações na concentração média durante os três períodos avaliados. Foram identificados 7749 protozoários, pertencentes a 17 gêneros diferentes. Observou-se que os gêneros Charonina e Entodinium apresentaram alta ocorrência no início, meio e final do período da seca (p 0,05), indicando a participação desses ciliados em bovinos alimentados exclusivamente a pasto, durante esse período do ano.

Protozoários ruminais de novilhos de corte criados em pastagem tropical durante o período seco / Rumen protozoa of steers raised on tropical pasture during dry season

Protozoa of the rumen can represent 40% of total nitrogen and 60% of the final product of fermentation and it has cellulolytic activity. This study aimed to quantify and identify the ruminal protozoa populations from steers, raised exclusively on pastures during the dry season in the north of Minas Gerais, Brazil. Samples of ruminal fluid of 36 Nellore steers were collected directly from the rumen immediately after slaughter, during the early, middle or end of the dry season. For protozoa conservation, 1 mL of ruminal fluid was diluted in 9 mL of 10 % formaldehydes solution. Decimal dilutions were made in saline and the counting of small, medium and large protozoa was performed in Sedgewick Rafter chamber. The protozoa concentrations were transformed into log10 (x +1), subjected to variance analysis and the means were compared with Duncan test. The genus frequencies were compared with chi-square test. The concentration average of the total and of small and medium protozoa declined significantly over the course of the dry season; however, alterations in large protozoa concentrations were not detected over the three periods evaluated. A total of 7749 protozoa were identified, belonging to 17 different genera. Charonina spp. and Entodinium spp. had the highest occurrence during the three periods of dry season (P 0.05), suggesting the participation of these ciliates in rumen cattle fed exclusively on tropical pasture during this season.

Protozoários do rúmen podem representar 40% do nitrogênio total e 60% do produto final da fermentação e apresentam atividade celulolítica. Neste estudo, objetivou-se quantificar e identificar as populações de protozoários no rúmen de novilhos, criados exclusivamente em pastagem, durante o período seco do ano, no Norte de Minas Gerais. Amostras do suco ruminal de 36 novilhos mestiços Nelore foram coletadas diretamente do rúmen, após o abate, durante o inicio, meio ou fim do período de estiagem. Para conservação dos protozoários, 1 mL do suco ruminal foi diluído em 9 mL de solução de formaldeido a 10%. Posteriormente, foram realizadas diluições decimais em solução salina e contagem de protozoários pequenos, médios e grandes em câmara de Sedgewick Rafter. As concentrações de protozoários foram transformadas em log10 (x+1) e submetidas à análise de variância e as médias comparadas com teste de Duncan. As frequências dos gêneros foram comparadas com o teste do qui-quadrado. As médias da concentração total e de pequenos e médios protozoários diminuíram significativamente com o decorrer do período seco; entretanto, os grandes protozoários não apresentaram alterações na concentração média durante os três períodos avaliados. Foram identificados 7749 protozoários, pertencentes a 17 gêneros diferentes. Observou-se que os gêneros Charonina e Entodinium apresentaram alta ocorrência no início, meio e final do período da seca (p<0,05), indicando a participação desses ciliados em bovinos alimentados exclusivamente a pasto, durante esse período do ano.

Concomitant zearalenone ingestion and porcine circovirus-2 infection

Background: Researches have suggested that mycotoxins could corroborate the pathogenesis of porcine viral diseases. Zearalenone (ZEA), one of the most import mycotoxicosis in pigs result significant reproductive disorders. The circovirosis syndromes in pigs have been associated with multifactorial or predisposing conditions. No previous data have correlated ZEA with viral syndromes in Sus scrofa. In this report are described anamnesis, clinical and histological findings with zearalenone ingestion and PCV-2 infection in a Brazilian livestock. Case: Feeding ration was mixed and produced at the farm with low quality corn that was stored in barn with cement floor. During ten months, 28 farrowing occurred. Fifteen of them were normal and produced 145 animals, mean of 9.66 piglets per litter. Thirteen sows presented reproductive disorders, and one died. Eight of them had the delayed farrowing and three aborted. These animals produced 57 mummified fetuses (10-16cm crown-rump length), 23 aborted fetuses (60-72 days of gestation), four stillborn, two teratogenic fetuses and only 16 normal piglets. Skin pustules, hemorrhagic spots and petechiae, as well as coughing were observed in 88% of the animals and four piglets died. Diarrhea outbreaks frequently occurred in this period. Twenty five of 34 gilts (75%) showed longer estrous cycle, estrus returning, vulvae volume and mammary glands enlargement. Necropsies showed enlarged lymphatic nodes and kidneys. Histopathological and immunohistochemical analysis indicated the presence of Porcine Circovirus type 2 (PCV-2) in analyzed tissues. Toxicological tests demonstrated the presence of zearalenone (ZEA) in stomach contents with average of 8.75 µg/g and pesticides and aflatoxins were not detected. Discussion: The history, the clinical signs, the necropsy and histological findings suggested a mix of zearalenone mycotoxicosis and PVC-2 syndrome that was confirmed by PVC-2 tissue detection in immunohistochemical assay, and by food toxicological analysis. The ZEA average founded in stomach contents (8.75 µg/g could produce the reproductive disorders and could has exacerbated the circovirosis. The most frequent reproductive alteration observed in the farrowing was mummified fetuses that corresponded 66.7% of its products. The several reproductive disorders as abortion, stillborn, mummified fetuses, estrus returning, vulvae volume and mammary glands enlargement in gilts are frequently related to zearalenone mycotoxicosis. Appetite loss, apathy, wasting, cough and diarrhea and increased mortality and withdrawal rate in growth and post-weaning phases observed in this study are liked as the several descriptions in the Post-Weaning Multisystemic Wasting Syndrome. The hemorrhagic skin spots and increased kidneys, with multifocal glomerulonephritis, lymphohistiocytic interstitial nephritis to remember the several alterations in Porcine Dermatitis and Nephropathy Syndrome. Both syndromes by PCV-2 could be simultaneity occurring in this herd and could have a co-participation of the ZEA ingestion as aggravated factor. After contaminated corn to sorghum free of ZEA exchange at ration, the reproduction returned to normal level and no PCV-2 lesions were observed, suggesting the ZEA ingestion as one initial or aggravating factor for the PCV-2 syndromes. For the first time, this report describes historical, anamnesis, clinical and histological findings possibly associated with zearalenone contamination and PCV-2 infection in pigs.

Análise da contaminação parasitária em compostos orgânicos produzidos com biossólidos de esgoto doméstico e resíduos agropecuários / Analysis of parasitological contamination in organic composts with sewage sludge and agricultural residues

Este estudo avaliou a contaminação por ovos de helmintos, cistos e oocistos de protozoários em compostos orgânicos utilizando lodo de esgoto doméstico e resíduos agropecuários. Foram realizadas análises parasitológicas em amostras de 25 diferentes compostos orgânicos, antes e após tratamento térmico a 60°C durante 12 horas. Os resultados demonstraram elevada contaminação parasitária em todos os compostos analisados antes do tratamento e a não redução dessa contaminação após o tratamento térmico. A identificação das larvas obtidas em coproculturas antes e após o tratamento térmico dos compostos indicou que os gêneros mais freqüentemente observados foram Cooperia e Trichostrongylus, que são nematóides gastrintestinais de ruminantes. Estes resultados demonstram que ovos de helmintos podem permanecer viáveis mesmo após o processo de compostagem e o tratamento térmico. Os compostos produzidos com lodo de esgoto doméstico e resíduo agropecuários, utilizando esses processos de tratamentos, podem constituir riscos de contaminação para humanos e animais.

This research aimed at evaluating the cysts, oocysts and eggs contamination before and after thermal treatment of 60°C for 12 hours, in 25 different organic composts produced with biosolids from domestic waste-water treatment and animal and agricultural residues. The results showed high parasitological contamination for all organic composts before the treatment and these contaminations were not reduced after thermic treatment. The larva identification in coprocultures before and after thermic treatment showed Cooperia spp. and Trichostrongylus spp. were the most prevalent nematodes. These results demonstrated that helmintus’ eggs can remain viable even after the composing and thermic treatment. The obtained composition with sewage sludge and agricultural residues through these treatment processes can establish contamination risks for humans and animals.

Análise da contaminação parasitária em compostos orgânicos produzidos com biossólidos de esgoto doméstico e resíduos agropecuários / Analysis of parasitological contamination in organic composts with sewage sludge and agricultural residues

Este estudo avaliou a contaminação por ovos de helmintos, cistos e oocistos de protozoários em compostos orgânicos utilizando lodo de esgoto doméstico e resíduos agropecuários. Foram realizadas análises parasitológicas em amostras de 25 diferentes compostos orgânicos, antes e após tratamento térmico a 60ºC durante 12 horas. Os resultados demonstraram elevada contaminação parasitária em todos os compostos analisados antes do tratamento e a não redução dessa contaminação após o tratamento térmico. A identificação das larvas obtidas em coproculturas antes e após o tratamento térmico dos compostos indicou que os gêneros mais freqüentemente observados foram Cooperia e Trichostrongylus, que são nematóides gastrintestinais de ruminantes. Estes resultados demonstram que ovos de helmintos podem permanecer viáveis mesmo após o processo de compostagem e o tratamento térmico. Os compostos produzidos com lodo de esgoto doméstico e resíduo agropecuários, utilizando esses processos de tratamentos, podem constituir riscos de contaminação para humanos e animais.(AU)

This research aimed at evaluating the cysts, oocysts and eggs contamination before and after thermal treatment of 60ºC for 12 hours, in 25 different organic composts produced with biosolids from domestic waste-water treatment and animal and agricultural residues. The results showed high parasitological contamination for all organic composts before the treatment and these contaminations were not reduced after thermic treatment. The larva identification in coprocultures before and after thermic treatment showed Cooperia spp. and Trichostrongylus spp. were the most prevalent nematodes. These results demonstrated that helmintus' eggs can remain viable even after the composing and thermic treatment. The obtained composition with sewage sludge and agricultural residues through these treatment processes can establish contamination risks for humans and animals.(AU)