O Departamento de Reprodução Animal da Faculdade de Medicina Veterinária e Zootecnia da Universidade de São Paulo (FMVZ/USP) elabora, desde 2002, estudo para avaliar o desempenho do mercado de protocolos de sincronização para o emprego da Inseminação Artificial em Tempo Fixo (IATF) em bovinos. Esses dados são comparados com as informações divulgadas pela ASBIA (Associação Brasileira de Inseminação Artificial), quanto ao número de doses de sêmen comercializadas (INDEX ASBIA-CEPEA), buscando estimar a evolução da comercialização de protocolos para realização da IATF, associada ao mercado de venda de sêmen no Brasil.

BARUSELLI, P.S. Em 2023, apesar da redução do número de protocolos comercializados, 91,2% das inseminações no Brasil foram realizadas por IATF Boletim Eletrônico do Departamento de Reprodução Animal/FMVZ/USP, 8a ed., 2024.

O INDEX ASBIA 2023 já está disponível para download.

As principais informações sobre o mercado de genética bovina e inseminação artificial no ano passado são expostas em detalhes no INDEX.

Fonte: ASBIA

Artigo científico - G3: GENES GENOMES GENETICS 

Genomic loci involved in sensing environmental cues and metabolism affect seasonal coat shedding in Bos taurus and Bos indicus cattle

Harly J. Durbin, Helen Yampara-Iquise, Troy N. Rowan, Robert D. Schnabel, James E. Koltes, Jeremy G. Powell, Jared E. Decker 

Seasonal shedding of winter hair at the start of summer is well studied in wild and domesticated populations. However, the genetic influences on this trait and their interactions are poorly understood. We use data from 13,364 cattle with 36,899 repeated phenotypes to investigate the relationship between hair shedding and environmental variables, single nucleotide polymorphisms, and their interactions to understand quantitative differences in seasonal shedding. Using deregressed estimated breeding values from a repeated records model in a genome-wide association analysis (GWAA) and meta-analysis of year-specific GWAA gave remarkably similar results. These GWAA identified hundreds of variants associated with seasonal hair shedding. There were especially strong associations between chromosomes 5 and 23. Genotype-by-environment interaction GWAA identified 1,040 day length-by-genotype interaction associations and 17 apparent temperature-by-genotype interaction associations with hair shedding, highlighting the importance of day length on hair shedding. Accurate genomic predictions of hair shedding were created for the entire dataset, Angus, Hereford, Brangus, and multibreed datasets. Loci related to metabolism and light-sensing have a large influence on seasonal hair shedding. This is one of the largest genetic analyses of a phenological trait and provides insight into both agriculture production and basic science.

Keywords: genotype-phenotype; phenology; hair shedding; molt; genetic interactions