Aspectos do melhoramento genético do gado canchim

Vianna, A. Teixeira; Barbin, Décio; Gomes, F. Pimentel

doi:10.1590/s0071-12761970000100007

Cited by 2 publications

(2 citation statements)

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“…The Canchim is a composite breed (62.5% Charolais and 37.5% Zebu) developed in the 1940s by the Brazilian Agricultural Research Corporation (Embrapa), located in São Carlos city, SP, Brazil [ 9 ]. Different crossbreeding schemes have been studied to produce Canchim cattle with different Charolais-Zebu proportions and to achieve greater genetic variability in the population [ 10 – 13 ].…”

Section: Methodsmentioning

confidence: 99%

Candidate genes for male and female reproductive traits in Canchim beef cattle

Buzanskas

Grossi²,

Ventura

et al. 2017

J Animal Sci Biotechnol

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BackgroundBeef cattle breeding programs in Brazil have placed greater emphasis on the genomic study of reproductive traits of males and females due to their economic importance. In this study, genome-wide associations were assessed for scrotal circumference at 210 d of age, scrotal circumference at 420 d of age, age at first calving, and age at second calving, in Canchim beef cattle. Data quality control was conducted resulting in 672,778 SNPs and 392 animals.ResultsAssociated SNPs were observed for scrotal circumference at 420 d of age (435 SNPs), followed by scrotal circumference at 210 d of age (12 SNPs), age at first calving (six SNPs), and age at second calving (four SNPs). We investigated whether significant SNPs were within genic or surrounding regions. Biological processes of genes were associated with immune system, multicellular organismal process, response to stimulus, apoptotic process, cellular component organization or biogenesis, biological adhesion, and reproduction.ConclusionsFew associations were observed for scrotal circumference at 210 d of age, age at first calving, and age at second calving, reinforcing their polygenic inheritance and the complexity of understanding the genetic architecture of reproductive traits. Finding many associations for scrotal circumference at 420 d of age in various regions of the Canchim genome also reveals the difficulty of targeting specific candidate genes that could act on fertility; nonetheless, the high linkage disequilibrium between loci herein estimated could aid to overcome this issue. Therefore, all relevant information about genomic regions influencing reproductive traits may contribute to target candidate genes for further investigation of causal mutations and aid in future genomic studies in Canchim cattle to improve the breeding program.Electronic supplementary materialThe online version of this article (doi:10.1186/s40104-017-0199-8) contains supplementary material, which is available to authorized users.

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Section: Methodsmentioning

confidence: 99%

Candidate genes for male and female reproductive traits in Canchim beef cattle

Buzanskas

Grossi²,

Ventura

et al. 2017

J Animal Sci Biotechnol

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“…Zebu breeds are considered highly adapted to the tropical environment in Brazil [2-5], but they are known for their lower meat quality in certain aspects, such as tenderness, palatability, and marbling [6-10], and for their lower reproduction efficiency [11,12] when compared to Bos taurus . The Canchim (3/8 zebu + 5/8 Charolais) breed was developed in the early 1960’s in Brazil [13] with the intention of combining fitness traits from zebu to the higher reproduction efficiency and meat quality from the Charolais breed.…”

Section: Introductionmentioning

confidence: 99%

Genome-wide association study for backfat thickness in Canchim beef cattle using Random Forest approach

et al. 2013

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BackgroundMeat quality involves many traits, such as marbling, tenderness, juiciness, and backfat thickness, all of which require attention from livestock producers. Backfat thickness improvement by means of traditional selection techniques in Canchim beef cattle has been challenging due to its low heritability, and it is measured late in an animal’s life. Therefore, the implementation of new methodologies for identification of single nucleotide polymorphisms (SNPs) linked to backfat thickness are an important strategy for genetic improvement of carcass and meat quality.ResultsThe set of SNPs identified by the random forest approach explained as much as 50% of the deregressed estimated breeding value (dEBV) variance associated with backfat thickness, and a small set of 5 SNPs were able to explain 34% of the dEBV for backfat thickness. Several quantitative trait loci (QTL) for fat-related traits were found in the surrounding areas of the SNPs, as well as many genes with roles in lipid metabolism.ConclusionsThese results provided a better understanding of the backfat deposition and regulation pathways, and can be considered a starting point for future implementation of a genomic selection program for backfat thickness in Canchim beef cattle.

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Aspectos do melhoramento genético do gado canchim

Cited by 2 publications

References 1 publication

Candidate genes for male and female reproductive traits in Canchim beef cattle

Candidate genes for male and female reproductive traits in Canchim beef cattle

Genome-wide association study for backfat thickness in Canchim beef cattle using Random Forest approach

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