Data/hora: 24/06/2024 13:43:53

Biblioteca(s): 	Embrapa Gado de Corte.	
Data corrente: 	17/10/2023	
Data da última atualização: 	17/10/2023	
Autoria: 	TORAL, F. L. B.; MENEZES, G. R. de O.; SILVA, L. O. C. da; NIETO, L. M.; SOUZA JR., M. D. de; TORRES JUNIOR, R. A. de A.	
Afiliação: 	FABIO LUIZ BURANELO TORAL, UNIVERSIDADE FEDERAL DE MINAS GERAIS; GILBERTO ROMEIRO DE OLIVEIRA MENEZE, CNPGC; LUIZ OTAVIO CAMPOS DA SILVA, CNPGC; LEONARDO MARTIN NIETO, GENEPLUS CONSULTORIA AGROPECUÁRIA LTDA; MAURY DORTA DE SOUZA JR., GENEPLUS CONSULTORIA AGROPECUÁRIA LTDA; ROBERTO AUGUSTO DE A TORRES JUNIOR, CNPGC.	
Título: 	Benchmarking in a beef cattle breeding program: lessons from the best breeders.	
Ano de publicação: 	2023	
Fonte/Imprenta: 	Journal of Animal Breeding and Genetics, v. 140, n. 3, 2023.	
Páginas: 	8 p.	
Idioma: 	Inglês	
Conteúdo: 	Beef cattle breeding programs offer genetic evaluations and consulting services on animal breeding practices to help breeders improve the genetic merit of their herds. Some breeders are more willing to apply best practices and technologies than others. Consequently, the average genetic merit and genetic trends differ across herds. We benchmarked some parameters of an average herd (AVE) and the corresponding parameters of herds with higher genetic merit (TOP), both participating in a commercial Nellore breeding program. Expected progeny differences (EPD) for growth, reproductive and carcass traits and a selection index (SI) of animals born from 2005 to 2019 on 128 farms located in Brazil, Bolivia and Paraguay were used to compute the AVE parameters. The 20 herds with higher mean SI of animals born in the last five birth seasons were classified as TOP herds. The mean SI and EPD of animals born in the last five seasons in the TOP herds were, respectively, 89% and 79% to 206% higher (p&#8201;&#8804;&#8201;0.001) than those of animals from the AVE herd. Genetic trends over the entire period were also higher (50% for SI and 31% to 88% separately for each trait, p&#8201;&#8804;&#8201;0.006) in the TOP herds compared to the AVE herd. Although the difference in the numbers of cows, bulls and calves between the TOP and AVE herds did not reach statistical significance (p = 0.175, p = 0.273 and p = 0.061, respectively), the numbers of progeny per cow and per bull were 21% (p = 0.012) and 26% (p = 0.047) higher in the TOP herds, respectively. Multiple ovulation and embryo transfer and in vitro fertilization and embryo transfer (MOET/IVF) accounted for a higher percentage of births in the TOP herds compared to AVE (24.6% vs. 12.5%, p = 0.002). The generation interval was 17% shorter (p&#8201;<&#8201;0.001) in the TOP herds compared to AVE. The average inbreeding coefficient of animals from the TOP herds (1.08&#8201;±&#8201;0.52%) did not differ (p = 0.78) from that of AVE animals (1.26&#8201;±&#8201;0.96%). In general, AVE herds are evolving in the desirable direction but differences in genetic merit between AVE and TOP herds are increasing over time. The more frequent use of MOET/IVF, a lower cow-to-bull ratio, and a larger family size (progeny per cow or per bull) can help achieve larger selection differentials and increase genetic trends and average genetic merits of TOP herds compared to AVE herds.	
Thesaurus Nal: 	Cattle breeding; Embryo transfer; Genetic merit; Genetic trend; In vitro fertilization.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Gado de Corte (CNPGC)	
Exemplares: 	CNPGC - (17918-1) - UPC - AP - DD -  -  -  - DIS