The objective of this research was to evaluate in situ degradability of main forage species in th... more The objective of this research was to evaluate in situ degradability of main forage species in the native grassland in a silvopastoral system with salicaceas in the region of the lower Paraná river Delta. For the in situ evaluation, there were used five steers with water-pipe ruminal. The samples were incubated for 24 and 48 h. At 24 h. Alternantheraphiloxeroides turned out to be the species of more degradability (78.5%). Loliummultiflorum (54.7%) was in second place, and Phalarisangusta (43.1%) and Echinochloahelodes (43.0%) were located in the third order. The rest of the species showed values below 40%, with Carex riparia (24.8%), Paspalum urvillei (21.4%), and Panicumpernambucense (19.7%) without significant differences among them. At 48 h, A. philoxeroides resulted first with 80.7%, followed by P. angusta (63.0%) and L. multiflorum (62.5%). E. helodes (52.4%) was in third place. The fourth group was composed by Paspalidiumpaludivagum (45.1%) and Glyceriamultiflora (44.1%). Acco...
The aim of the present research was to determine the forage quality of grassland in a silvopastor... more The aim of the present research was to determine the forage quality of grassland in a silvopastoral system of the Delta of the Paraná river, Argentina. For this research, there was conducted a census that showed the dominance of the species Carexriparia , Cyperus spp., Scirpusgiganteus , Scirpuscalifornicus y Polygonum spp. Other species were present in lower proportion, Panicumpernambucensis ,Panicumelephantipes , Paspalumurvillei ; Loliummultiflorum , Phalarisangusta , Glyceriamultiflora , Leersiahexandra , Echinochloa sp. y Alternantherafiloxeroides . Cuts and determination of nutritional value of the samples were made. The results showed the following values: for dry matter 36.6%, crude protein 9.24%, neutral detergent fiber 67.9%, and acid detergent fiber (ADF) 40.6%. Digestibility estimated based on the ADF resulted in an average of 57.3%. Values of total polyphenols were relatively low, ranging between 2.77 and 0.83%, being the average 1.99%.
The objective of this research was to evaluate in situ degradability of main forage species in th... more The objective of this research was to evaluate in situ degradability of main forage species in the native grassland in a silvopastoral system with salicaceas in the region of the lower Paraná river Delta. For the in situ evaluation, there were used five steers with water-pipe ruminal. The samples were incubated for 24 and 48 h. At 24 h. Alternanthera philoxeroides turned out to be the species of more degradability (78.5%). Lolium multiflorum (54.7%) was in second place, and Phalaris angusta (43.1%) and Echinochloa helodes (43.0%) were located in the third order. The rest of the species showed values below 40%, with Carex riparia (24.8%), Paspalum urvillei (21.4%), and Panicum pernambucense (19.7%) without significant differences among them. At 48 h, A. philoxeroides resulted first with 80.7%, followed by P. angusta (63.0%) and L. multiflorum (62.5%). E. helodes (52.4%) was in third place. The fourth group was composed by Paspalidium paludivagum (45.1%) and Glyceria multiflora (44.1%...
The Estuary of Bahía Blanca (EBB), Argentina, is an important wetland under intense sewage pollut... more The Estuary of Bahía Blanca (EBB), Argentina, is an important wetland under intense sewage pollution. We investigated the occurrence of Clostridium perfringens (CP) in populations of two benthic crabs (Neohelice granulata and Cyrtograpsus angulatus) and in sediment from the EBB. CP was found in 49.1% of the crabs and all of the isolates were identified as type A. The alpha (cpa) and enterotoxin (cpe) encoding genes were identified. Genetic analyses identified 13 novel sequence types, and found no clustering among isolates, suggesting that CP is not part of the crabs' commensal flora. CP carriage was 51 times more likely in crabs from the area nearest sewage outfalls compared with crabs from a reference site. Our in vitro experiments suggest that the carriage of CP in crabs is transient. The use of these benthic crabs as monitoring organisms of sewage pollution in coastal habitats is proposed.
Beef cattle production systems in Argentina are based on direct grazing. There are complex grazin... more Beef cattle production systems in Argentina are based on direct grazing. There are complex grazing subsystems within the beef cattle production systems that need to be differentiated in order to guide appropriate technological changes. The purpose of this work was: to identify a livestock farm (LF) typology; to link the resulting typology with characteristic of use of the land, activities
The objective of this research was to evaluate in situ degradability of main forage species in th... more The objective of this research was to evaluate in situ degradability of main forage species in the native grassland in a silvopastoral system with salicaceas in the region of the lower Paraná river Delta. For the in situ evaluation, there were used five steers with water-pipe ruminal. The samples were incubated for 24 and 48 h. At 24 h. Alternantheraphiloxeroides turned out to be the species of more degradability (78.5%). Loliummultiflorum (54.7%) was in second place, and Phalarisangusta (43.1%) and Echinochloahelodes (43.0%) were located in the third order. The rest of the species showed values below 40%, with Carex riparia (24.8%), Paspalum urvillei (21.4%), and Panicumpernambucense (19.7%) without significant differences among them. At 48 h, A. philoxeroides resulted first with 80.7%, followed by P. angusta (63.0%) and L. multiflorum (62.5%). E. helodes (52.4%) was in third place. The fourth group was composed by Paspalidiumpaludivagum (45.1%) and Glyceriamultiflora (44.1%). Acco...
The aim of the present research was to determine the forage quality of grassland in a silvopastor... more The aim of the present research was to determine the forage quality of grassland in a silvopastoral system of the Delta of the Paraná river, Argentina. For this research, there was conducted a census that showed the dominance of the species Carexriparia , Cyperus spp., Scirpusgiganteus , Scirpuscalifornicus y Polygonum spp. Other species were present in lower proportion, Panicumpernambucensis ,Panicumelephantipes , Paspalumurvillei ; Loliummultiflorum , Phalarisangusta , Glyceriamultiflora , Leersiahexandra , Echinochloa sp. y Alternantherafiloxeroides . Cuts and determination of nutritional value of the samples were made. The results showed the following values: for dry matter 36.6%, crude protein 9.24%, neutral detergent fiber 67.9%, and acid detergent fiber (ADF) 40.6%. Digestibility estimated based on the ADF resulted in an average of 57.3%. Values of total polyphenols were relatively low, ranging between 2.77 and 0.83%, being the average 1.99%.
The objective of this research was to evaluate in situ degradability of main forage species in th... more The objective of this research was to evaluate in situ degradability of main forage species in the native grassland in a silvopastoral system with salicaceas in the region of the lower Paraná river Delta. For the in situ evaluation, there were used five steers with water-pipe ruminal. The samples were incubated for 24 and 48 h. At 24 h. Alternanthera philoxeroides turned out to be the species of more degradability (78.5%). Lolium multiflorum (54.7%) was in second place, and Phalaris angusta (43.1%) and Echinochloa helodes (43.0%) were located in the third order. The rest of the species showed values below 40%, with Carex riparia (24.8%), Paspalum urvillei (21.4%), and Panicum pernambucense (19.7%) without significant differences among them. At 48 h, A. philoxeroides resulted first with 80.7%, followed by P. angusta (63.0%) and L. multiflorum (62.5%). E. helodes (52.4%) was in third place. The fourth group was composed by Paspalidium paludivagum (45.1%) and Glyceria multiflora (44.1%...
The Estuary of Bahía Blanca (EBB), Argentina, is an important wetland under intense sewage pollut... more The Estuary of Bahía Blanca (EBB), Argentina, is an important wetland under intense sewage pollution. We investigated the occurrence of Clostridium perfringens (CP) in populations of two benthic crabs (Neohelice granulata and Cyrtograpsus angulatus) and in sediment from the EBB. CP was found in 49.1% of the crabs and all of the isolates were identified as type A. The alpha (cpa) and enterotoxin (cpe) encoding genes were identified. Genetic analyses identified 13 novel sequence types, and found no clustering among isolates, suggesting that CP is not part of the crabs' commensal flora. CP carriage was 51 times more likely in crabs from the area nearest sewage outfalls compared with crabs from a reference site. Our in vitro experiments suggest that the carriage of CP in crabs is transient. The use of these benthic crabs as monitoring organisms of sewage pollution in coastal habitats is proposed.
Beef cattle production systems in Argentina are based on direct grazing. There are complex grazin... more Beef cattle production systems in Argentina are based on direct grazing. There are complex grazing subsystems within the beef cattle production systems that need to be differentiated in order to guide appropriate technological changes. The purpose of this work was: to identify a livestock farm (LF) typology; to link the resulting typology with characteristic of use of the land, activities
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