Genetic parameter estimates for gastrointestinal nematode parasite resistance and maternal efficiency indicator traits in Santa Ines breed

Autor(es)

Berton, Mariana P. ^[1] ; Silva, Rosiane P. ^[2] ; Carvalho, Felipe E. ^[2] ; Justino Chiaia, Hermenegildo Lucas ^[1] ; Oliveira, Priscila S. ^[2] ; Eler, Joanir P. ^[2] ; Banchero, Georgget ^[3] ; Ferraz, Jose B. S. ^[2] ; Baldi, Fernando ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Fac Ciencias Agr & Vet, Dept Zootecnia, Jaboticabal, SP - Brazil

^[2] Univ Sao Paulo, Fac Zootecn & Engn Alimentos, Nucleo Apoio Pesquisa Melhoramento Anim Biotecnol, Pirassununga, SP - Brazil

^[3] INIA, Colonia - Uruguay

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ANIMAL BREEDING AND GENETICS; JULY 2019.
• Citações Web of Science: 0

Resumo

Infection with Haemonchus contortus is the most economically important gastrointestinal nematode parasitosis and the most important cause of mortality in sheep production. The aim of this study was to estimate variance components of gastrointestinal parasite resistance traits, maternal efficiency (ME) and ewe adult weight (AW) in Santa Ines breed in tropical conditions. The phenotypic records were collected from 700 animals, belonging to four flocks located south-east and north-east in Brazil. The evaluated traits were as follows: degree of anaemia assessed using the FAMACHA chart (FMC), haematocrit (HCT), white blood cell (WBC), red blood cell (RBC), haemoglobin (HGB), platelets (PLT), faecal egg count (EPG(log)), ME, metabolic maternal efficiency (MME), AW and metabolic ewe adult weight (MAW). From the 700 animals, 576 (82% of the evaluated population) were genotyped with the Ovine SNP12k BeadChip (Illumina, Inc.). Markers with unknown genomic position, located on sex chromosomes, monomorphic, with minor allele frequency <0.05, call rate <90% and with excess heterozygosity were excluded. The variance components were estimated using a single-trait animal model with ssGBLUP procedure. The correlation between the parasite's resistance indicators and the ME suggested that selecting animals with both higher adult weight and ME will also favour the selection of animals with better resistance to gastrointestinal nematodes parasites, specially H. contortus. Therefore, since there are few or no studies with Santa Ines breed in this area, it is important to study those traits to better manage selection programs. (AU)

• Processo FAPESP: 11/00396-6 - Estudo da diversidade genética e análise de associações de polimorfismo de nucleotídio único (SNPs) com resistência a endoparasitas gastrointestinais e prolificidade de ovinos da raça Santa Inês
• Beneficiário: José Bento Sterman Ferraz
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/10493-5 - Estudo de associação genômica em resistência à parasitas gastrointestinais em ovinos Santa Inês utilizando SNPs e CNVs
• Beneficiário: Mariana Piatto Berton
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 14/07566-2 - Genômica aplicada à produção de ruminantes
• Beneficiário: José Bento Sterman Ferraz
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 10/05516-7 - Estudo da diversidade genética e análise de associações de polimorfismos de nucleotídeo único(SNPs)com resistência a endoparasitas gastrointestinais e prolificidade de ovinos da raça Santa Inês
• Beneficiário: Priscila Silva Oliveira
• Modalidade de apoio: Bolsas no Brasil - Doutorado