Parâmetros genéticos para características de desempenho em ovinos naturalizados Sul-Mato-Grossenses

Oliveira, Denise de; Oliveira, Carlos Antônio Lopes de; Martins, Elias Nunes; Vargas, Fernando Miranda de; Seno, L. O.; Pinto, Guilherme dos Santos; Sasa, Aya; Ferreira, Marcos Barbosa

doi:10.5433/1679-0359.2014v35n2p963

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…Females of this breed have no reproductive seasonality and are an important role in the performance of their lambs during the period from birth to weaning [2,3]. Lambs have a satisfactory productive potential, in terms of carcass traits and meat quality [3,4]. In addition, Pantaneiro sheep produce wool, which can be used as feedstock in regional craftwork.…”

Section: Introductionmentioning

confidence: 99%

“…They can be used as an animal genetic resource to improve sheep production for meat and milk in this state. Females of this breed have no reproductive seasonality and are an important role in the performance of their lambs during the period from birth to weaning [2,3]. Lambs have a satisfactory productive potential, in terms of carcass traits and meat quality [3,4].…”

Section: Introductionmentioning

confidence: 99%

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Application of microsatellite markers for breeding and genetic conservation of herds of Pantaneiro sheep

Crispim

Seno

Egito

et al. 2014

Electronic Journal of Biotechnology

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Background:The aim of the present study was to assess the genetic diversity of Pantaneiro sheep, using microsatellite markers, in order to assist maintenance and management plans, enhance mating systems and reduce the inbreeding rate. A total of 127 animals were genotyped at eight microsatellite loci. They belonged to populations from the Experimental Farm of the Universidade Federal da Grande Dourados (UFGD) (Dourados/MS/Brazil) and Embrapa Pantanal (Corumbá/MS/Brazil). Results: The population of Pantaneiro sheep from the UFGD exhibited a high mean number of alleles (11.13) and allelic richness (10.66). The polymorphic information content was highly informative in the locus studied, resulting in a mean value of 0.71. Observed heterozygosity was lower than expected for all molecular markers assessed. The analysis of molecular variance showed a differentiation rate of 5.2% between populations. Conclusions: The results of the statistical parameters indicated that populations of Pantaneiro sheep require special attention on herd management, and it's further necessary to implement breeder exchange programs in order to preserve the genetic variability of these populations. Furthermore, the maintenance of those populations in their typical habitats is rather required to allow different responses from the herds to the interactions between genotype and environment.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of microsatellite markers for breeding and genetic conservation of herds of Pantaneiro sheep

Crispim

Seno

Egito

et al. 2014

Electronic Journal of Biotechnology

View full text Add to dashboard Cite

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SNP Markers: Analysis of Genetic Diversity and Identification of Genomic Regions in Pantaneiro Sheep and Texel Sheep Under Natural Selection

Sousa,

Araujo,

Diniz Sobrinho

et al. 2024

Front. Biosci. (Schol Ed)

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Background: Sheep farming is growing substantially in Brazil, driven by the increasing demand for sheep meat. This rising demand has heightened the focus on sheep, making them the subject of numerous studies, including those centered on genetic analysis. A notable research area involves Pantaneiro sheep, which are indigenous to the Pantanal region of Mato Grosso do Sul and other locations. These sheep are of particular interest due to their adaptation to the unique environmental conditions of the Pantanal, a floodplain characterized by its distinctive climatic and ecological features. This study primarily aimed to conduct a comprehensive genomic analysis of Pantanal sheep subjected to natural selection within the Pantanal region and compare different sample herds using methodological approaches. Methods: Genomic analysis was performed to examine genetic diversity and structure via GGP50K single nucleotide polymorphism (SNP) analysis. A sample of 192 adult sheep over 4 years old was categorized into seven populations based on location: Six populations comprised Pantaneiro sheep with one Texel sheep population. Outlier SNPs were assessed to pinpoint regions under natural selection, with comparisons between the Pantaneiro and the commercial Texel breeds. All data analyses were conducted using the R programming language, employing specialized genetic analysis packages. These outlier SNPs were detected using three methodologies, PCAdapt, OutFLANK, and FDIST2/fsthet, with false discovery rate (FDR) corrections applied to ensure result accuracy. Each method was evaluated, and the genes associated with the identified SNPs were cross-referenced with the most recent sheep genome database, focusing specifically on genes with known phenotypic traits. Results: Analysis of a sample comprising 192 adult individuals revealed greater genetic variability within the Pantaneiro breed than the Texel breed, highlighting the adaptation of the Pantaneiro breed to the unique Pantanal environment. Conversely, the Texel breed exhibited significantly higher levels of inbreeding, attributed to its controlled breeding practices. Outlier SNPs were detected with notable variation across different methodologies, underscoring the importance of FDR correction in ensuring the reliability and concentration of identified outliers. These outlier SNPs facilitated the identification of genes associated with key phenotypic traits, including hair growth, tissue regeneration, pigmentation regulation, and muscle capacity. Conclusion: The integrated analysis of methodologies demonstrated significant efficiency in elucidating the genomic landscape of Pantanal sheep, highlighting the genetic richness inherent in sheep from the Pantanal region of Mato Grosso do Sul. The techniques employed effectively identified outlier SNPs associated with phenotypically relevant genes. These findings, which reveal greater genetic variability and adaptability, underscore the potential of these animals for future research and their significance within Brazilian sheep farming. The Texel breed served as a valuable comparative group, illustrating the limited genetic variability in highly controlled breeding environments.

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Meat quality of Pantaneiro lambs at different body weights

Hirata

Fernandes

Fuzikawa

et al. 2019

SCA

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The aim of this study was to assess the meat quality of Pantaneiro lambs finished in confinement and slaughtered at different body weights (15, 20, 25, 30, and 35 kg). Forty-five non-castrated male Pantaneiro lambs were distributed in a completely randomized design, with five treatments and nine replicates. The animals were housed in individual pens and slaughtered when they reached the target weights. For instrumental and centesimal analyses, the Semimembranosus, Longissimus lumborum, Gluteobiceps, and Triceps brachii muscles were used, whereas for fatty acid profile analysis only the Longissimus lumborum muscle was used. The different body weights influenced the final pH of the meat, but this still remained within the recommended values; however, the meat of heavier lambs had increased water-holding capacity (WHC), redness (a*), and fat content, making it the tenderest but least luminous and humid meat. Greater body weight led to a higher saturated fatty acid (SFA) content, reduction of monounsaturated fatty acid (MUFA) and polyunsaturated fatty acid (PUFA), higher hypercholesterolemic fatty acid content (H), and higher atherogenicity (AI) and thrombogenicity indexes (TI). Therefore, it was concluded that the meat of lambs slaughtered at lower body weight presented better nutritional quality, making it more suitable for human consumption.

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Parâmetros genéticos para características de desempenho em ovinos naturalizados Sul-Mato-Grossenses

Cited by 3 publications

References 4 publications

Application of microsatellite markers for breeding and genetic conservation of herds of Pantaneiro sheep

Application of microsatellite markers for breeding and genetic conservation of herds of Pantaneiro sheep

SNP Markers: Analysis of Genetic Diversity and Identification of Genomic Regions in Pantaneiro Sheep and Texel Sheep Under Natural Selection

Meat quality of Pantaneiro lambs at different body weights

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