Fecha/hora: 16/06/2024 08:34:44

Biblioteca(s): 	INIA Las Brujas.	
Fecha corriente: 	13/11/2015	
Fecha de la última actualización: 	15/10/2019	
Autoria: 	FRAGOMENI, B.O.; LOURENCO, D.A.L.; TSURUTA, S.; MASUDA, Y.; AGUILAR, I.; LEGARRA, A.; LAWLOR, T.J.; MIZTAL, I.	
Afiliación: 	IGNACIO AGUILAR GARCIA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay.	
Título: 	Hot topic: Use of genomic recursions in single-step genomic best linear unbiased predictor (BLUP) with a large number of genotypes.	
Año de publicación: 	2015	
Fuente/Imprenta: 	Journal of Dairy Science, 2015, v.98, no.6, p.4090-4094. OPEN ACCESS.	
ISSN: 	0022-0302	
DOI: 	10.3168/jds.2014-9125	
Idioma: 	Inglés	
Notas: 	Article history: Received November 18, 2014 / Accepted March 13, 2015 / Published online: April 8, 2015.	
Contenido: 	ABSTRACT.

The purpose of this study was to evaluate the accuracy of genomic selection in single-step genomic BLUP (ssGBLUP) when the inverse of the genomic relationship matrix (G) is derived by the "algorithm for proven and young animals" (APY). This algorithm implements genomic recursions on a subset of "proven" animals. Only a relationship matrix for animals treated as "proven" needs to be inverted, and the extra costs of adding animals treated as "young" are linear. Analyses involved 10,102,702 final scores on 6,930,618 Holstein cows. Final score, which is a composite of type traits, is popular trait in the United States and was easily available for this study. A total of 100,000 animals with genotypes were used in the analyses and included 23,000 sires (16,000 with >5 progeny), 27,000 cows, and 50,000 young animals. Genomic EBV (GEBV) were calculated with a regular inverse of G, and with the G inverse approximated by APY. Animals in the proven subset included only sires (23,000), sires + cows (50,000), only cows (27,000), or sires with >5 progeny (16,000). The correlations of GEBV with APY and regular GEBV for young genotyped animals were 0.994, 0.995, 0.992, and 0.992, respectively Later, animals in the proven subset were randomly sampled from all genotyped animals in sets of 2,000, 5,000, 10,000, 15,000, and 20,000; each sample was replicated 4 times. Respective correlations were 0.97 (5,000 sample), 0.98 (10,000 sample), and 0.99 (20,000 sample), with minimal difference between samples of the same size. Genomic EBV with APY were accurate when the number of animals used in the subset is between 10,000 and 20,000, with little difference between the ways of creating the subset. Due to the approximately linear cost of APY, ssGBLUP with APY could support any number of genotyped animals without affecting accuracy. 

© 2015 American Dairy Science Association.	
Palabras-Clave: 	ANIMALIA; GENOMIC RECURSION; GENOMIC SELECTION; SINGLE-STEP GENOMIC BLUP.	
Thesagro: 	BLUP; MEJORAMIENTO GENETICO ANIMAL.	
Categoría del tema: 	L10 Genética y mejoramiento animal	
URL: 	http://www.ainfo.inia.uy/digital/bitstream/item/5183/1/Aguilar-I.-2015.-Jr.DairyScience-v.984-p.4090-4094.pdf
https://www.journalofdairyscience.org/article/S0022-0302(15)00238-6/pdf	
Registro original: 	INIA Las Brujas (LB)	
Ejemplares: 	LB - (100796-1) - PXI - AP - DD -  -  -  - DIS