Endogamy and genetic variability in selective mating using distribution of extremes

The objective of this study was to evaluate selective mating using distribution of extremes, among other mating strategies, on its ability to decrease the endogamy and the loss of genetic variability. The genetic simulation system (Genesys) was used to simulate two genomes (each one with a single characteristic whose distinction was the value of heritability) and the base and original populations. Each initial population was submitted to assisted selection by markers for ten consecutive generations. For evaluation of strategies, the estimated parameters were phenotypic value, endogamy and additive genetic variance, in different family sizes, for both characteristics. In all scenarios combining heritability and family sizes, the selective mating was superior to the others, in the ability to decrease endogamy and maintain higher magnitudes of genetic variability. Consequently, superior phenotypic increments were obtained, pointing to a major detection of quantitative trait loci in the assisted selection by markers due to gradual decrease of the additive genetic variance over the generations

Interatrial septal aneurysm associated with patent foramen ovale in a dog - case report

ABSTRACT Atrial septal aneurysm (ASA) is a rare congenital deformity of variable clinical relevance, often reported in association with patent foramen ovale (PFO). Transthoracic Doppler echocardiography (TTE) is the first choice for diagnosis, but complementary techniques, such as microbubble contrast, should be used. Despite its importance, in Veterinary Medicine, there is little information related to the subject, and the present study is the second report of this condition in dogs. The objective was to report a case of ASA type IV LR associated with PFO in a Shar Pei bitch, diagnosed by a combined approach of transthoracic echocardiography backed by agitated saline solution (microbubbles). During clinical care, the owners reported episodes of seizures as their main complaint. Echocardiographic examination revealed a type 4 LR atrial septal aneurysm and left ventricular systolic dysfunction. The use of microbubble contrast showed right-to-left shunt, confirming PFO. The recommended treatment was medication. It was concluded that the rarity of ASA in dogs may be due to incomplete diagnoses and the transthoracic echocardiographic examination allows its analysis and classification. Furthermore, ASA can be found in animals with or without evidence of heart disease and it should be investigated in patients with neurological alterations.</jats:p

Interatrial septal aneurysm associated with patent foramen ovale in a dog - case report

ABSTRACT Atrial septal aneurysm (ASA) is a rare congenital deformity of variable clinical relevance, often reported in association with patent foramen ovale (PFO). Transthoracic Doppler echocardiography (TTE) is the first choice for diagnosis, but complementary techniques, such as microbubble contrast, should be used. Despite its importance, in Veterinary Medicine, there is little information related to the subject, and the present study is the second report of this condition in dogs. The objective was to report a case of ASA type IV LR associated with PFO in a Shar Pei bitch, diagnosed by a combined approach of transthoracic echocardiography backed by agitated saline solution (microbubbles). During clinical care, the owners reported episodes of seizures as their main complaint. Echocardiographic examination revealed a type 4 LR atrial septal aneurysm and left ventricular systolic dysfunction. The use of microbubble contrast showed right-to-left shunt, confirming PFO. The recommended treatment was medication. It was concluded that the rarity of ASA in dogs may be due to incomplete diagnoses and the transthoracic echocardiographic examination allows its analysis and classification. Furthermore, ASA can be found in animals with or without evidence of heart disease and it should be investigated in patients with neurological alterations.</div

Anatomical description of the skulls of peccaries (Tayassu tajacu, Linnaeus 1758) by computed tomography

ABSTRACT The aim of this study was to evaluate the anatomical structures of the skulls of peccaries to establish the basis for their clinical study and future preclinical research. Ten skulls of adult peccaries were subjected to tomographic examination. The data obtained were processed via three-dimensional image reconstruction software (3D images). The reconstructions obtained from the neurocranium of the studied specimens allowed the identification and description of the following structures: nasal bone, frontal bone, parietal bones, incisor bone, maxillary bone, zygomatic bone, temporal bone, palatal bone, occipital bone, vomer bone, pterygoid bone, sphenoid bone, paranasal sinuses and orbit. Computed tomography proved to be an important diagnostic tool in the investigation of the skull of this species, allowing the acquisition of anatomical values not yet documented for the species in the literature.</jats:p

Detecção de locos de características quantitativas nos cromossomos 1, 2, 3, 12, 14, 15 e X de suínos: características de desempenho

Mapeou-se quantitative trait loci (QTL) associados a características de desempenho nos cromossomos 1, 2, 3, 12, 14, 15 e X de suínos pertencentes a uma população F2, formada a partir do cruzamento entre dois machos da raça naturalizada brasileira Piau e 18 fêmeas comerciais (Landrace x Large White x Pietrain). O mapa genético de ligação da população foi construído após a genotipagem dos animais para 35 marcadores microssatélites. As estimativas do conteúdo de informação polimórfica indicaram que os marcadores microssatélites foram adequados para as análises de QTL. Os dados foram analisados pelo mapeamento por intervalo usando-se o programa GridQTL. Encontraram-se seis QTL, sendo que o QTL genômico para idade ao abate atingiu a significância de 5% de probabilidade. As informações dos QTL detectados neste estudo são úteis para identificar genes que podem ser usados em conjunto com os métodos convencionais de seleção, aumentar a acurácia deles e prover uma compreensão dos fenótipos produtivos de suínos

Detecção de locos de características quantitativas nos cromossomos 1, 2, 3, 12, 14, 15 e X de suínos: características de desempenho Detection of quantitative trait loci on chromosomes 1, 2, 3, 12, 14, 15, X in pigs: performance characteristics

Mapeou-se quantitative trait loci (QTL) associados a características de desempenho nos cromossomos 1, 2, 3, 12, 14, 15 e X de suínos pertencentes a uma população F2, formada a partir do cruzamento entre dois machos da raça naturalizada brasileira Piau e 18 fêmeas comerciais (Landrace x Large White x Pietrain). O mapa genético de ligação da população foi construído após a genotipagem dos animais para 35 marcadores microssatélites. As estimativas do conteúdo de informação polimórfica indicaram que os marcadores microssatélites foram adequados para as análises de QTL. Os dados foram analisados pelo mapeamento por intervalo usando-se o programa GridQTL. Encontraram-se seis QTL, sendo que o QTL genômico para idade ao abate atingiu a significância de 5% de probabilidade. As informações dos QTL detectados neste estudo são úteis para identificar genes que podem ser usados em conjunto com os métodos convencionais de seleção, aumentar a acurácia deles e prover uma compreensão dos fenótipos produtivos de suínos.The accomplishment of the present study had the objective of mapping Quantitative Trait Loci (QTL) related to performance traits in a F2 pig population developed by mating two Brazilian Piau breed sires with 18 dams from a commercial line (Landrace × Large White × Pietrain). The linkage map for this population was constructed after genotyping the animals for 35 microsatellite markers. Estimates of polymorphic information content indicated that the microsatellite markers were appropriate for QTL analyses. The genotypes were analyzed by interval mapping using the GridQTL program. A total of six QTL were found, of which the QTL for slaughter age (days) was significant at the 5% genome-wise level. The information of the significant QTL detected in this study is useful for future fine-mapping studies for the identification of genes. Such information can be used together with traditional methods in breeding programs or even for a better understanding of the phenotypes of swine production

Anatomical description of the skulls of peccaries (Tayassu tajacu, Linnaeus 1758) by computed tomography

ABSTRACT The aim of this study was to evaluate the anatomical structures of the skulls of peccaries to establish the basis for their clinical study and future preclinical research. Ten skulls of adult peccaries were subjected to tomographic examination. The data obtained were processed via three-dimensional image reconstruction software (3D images). The reconstructions obtained from the neurocranium of the studied specimens allowed the identification and description of the following structures: nasal bone, frontal bone, parietal bones, incisor bone, maxillary bone, zygomatic bone, temporal bone, palatal bone, occipital bone, vomer bone, pterygoid bone, sphenoid bone, paranasal sinuses and orbit. Computed tomography proved to be an important diagnostic tool in the investigation of the skull of this species, allowing the acquisition of anatomical values not yet documented for the species in the literature.</div