Use of grayscale histogram to assess testicular changes in ram caused by heat stress

Because it detects discrete changes in tissue density, ultrasound allows an early diagnosis of physiologic changes, especially when dealing with subclinical changes. aimed to evaluate the use of quantitative analysis of the gray scale of ultrasound images of ovine testicles as a method for early diagnosis of testicular changes caused by heat stress. Testicles from ten ovine were insulated and then evaluated regarding echogenicity, echotexture, anatomical measurements, and seminal characteristics. Echogenicity was the first variable to show changes during the insulation period, as well as the first one to show evidence of regeneration of those changes. There was a correlation (p 0.05) in echotexture. Testicular measurements were only altered (p < 0.05) after insulation; however, the structural integrity of the seminiferous tubules was not altered. Echogenicity is an efficient ultrasound parameter for the early diagnosis of a testicular degenerative process as well as for the early diagnosis of its regeneration

Use of grayscale histogram to assess testicular changes in ram caused by heat stress

Because it detects discrete changes in tissue density, ultrasound allows an early diagnosis of physiologic changes, especially when dealing with subclinical changes. aimed to evaluate the use of quantitative analysis of the gray scale of ultrasound images of ovine testicles as a method for early diagnosis of testicular changes caused by heat stress. Testicles from ten ovine were insulated and then evaluated regarding echogenicity, echotexture, anatomical measurements, and seminal characteristics. Echogenicity was the first variable to show changes during the insulation period, as well as the first one to show evidence of regeneration of those changes. There was a correlation (p &lt; 0.05) between echogenicity and sperm vigor, motility, and mass sperm motility, as well as a correlation (p &lt; 0.05) between echotexture and motility. Echogenicity, motility, vigor, and mass sperm motility decreased (p &lt; 0.05) within four days of testicular insulation, and there was no change (p &gt; 0.05) in echotexture. Testicular measurements were only altered (p &lt; 0.05) after insulation; however, the structural integrity of the seminiferous tubules was not altered. Echogenicity is an efficient ultrasound parameter for the early diagnosis of a testicular degenerative process as well as for the early diagnosis of its regeneration.Because it detects discrete changes in tissue density, ultrasound allows an early diagnosis of physiologic changes, especially when dealing with sub-clinical changes. The study aimed to evaluate the use of quantitative analysis of the grayscale of ultrasound images of ovine testicles as a method for early diagnosis of testicular changes caused by heat stress. Testicles from ten rams were insulated and then evaluated regarding echogenicity, echotexture, anatomical measurements, and seminal characteristics. Echogenicity was the first variable to show changes during the insulation period, as well as the first one to show evidence of regeneration of those changes. There was a correlation (p &lt; 0.05) between echogenicity and sperm vigor, sperm motility, and mass sperm motility, as well as a correlation (p &lt; 0.05) between echotexture and motility. Echogenicity, sperm motility, vigor, and mass sperm motility decreased (p &lt; 0.05) within four days of testicular insulation, and there was no change (p &gt; 0.05) in echotexture. Testicular measurements were only altered (p &lt; 0.05) after insulation. Echogenicity is an efficient ultrasound parameter for the early diagnosis of a testicular degenerative process as well as for the early diagnosis of its regeneration

Neotropical freshwater fisheries : A dataset of occurrence and abundance of freshwater fishes in the Neotropics

The Neotropical region hosts 4225 freshwater fish species, ranking first among the world's most diverse regions for freshwater fishes. Our NEOTROPICAL FRESHWATER FISHES data set is the first to produce a large-scale Neotropical freshwater fish inventory, covering the entire Neotropical region from Mexico and the Caribbean in the north to the southern limits in Argentina, Paraguay, Chile, and Uruguay. We compiled 185,787 distribution records, with unique georeferenced coordinates, for the 4225 species, represented by occurrence and abundance data. The number of species for the most numerous orders are as follows: Characiformes (1289), Siluriformes (1384), Cichliformes (354), Cyprinodontiformes (245), and Gymnotiformes (135). The most recorded species was the characid Astyanax fasciatus (4696 records). We registered 116,802 distribution records for native species, compared to 1802 distribution records for nonnative species. The main aim of the NEOTROPICAL FRESHWATER FISHES data set was to make these occurrence and abundance data accessible for international researchers to develop ecological and macroecological studies, from local to regional scales, with focal fish species, families, or orders. We anticipate that the NEOTROPICAL FRESHWATER FISHES data set will be valuable for studies on a wide range of ecological processes, such as trophic cascades, fishery pressure, the effects of habitat loss and fragmentation, and the impacts of species invasion and climate change. There are no copyright restrictions on the data, and please cite this data paper when using the data in publications