Data/hora: 04/06/2024 00:45:21

Provedor de dados: | 65
País: | Brazil
Título: | Strategies to control inbreeding in a pig breeding program: a simulation study
Autores: | Lopes,Jader Silva; Rorato,Paulo Roberto Nogara; Mello,Fernanda Cristina Breda; Freitas,Marcelo Silva de; Prestes,Alan Miranda; Garcia,Diogo Anastácio; Oliveira,Maurício Morgado de.
Data: | 2019-01-01
Ano: | 2019
Palavras-chave: | Full-sibs; Half-sibs; Landrace breed; Pietrain breed; Selection strategies.
Resumo: | ABSTRACT:  The objective of this study was to evaluate, through data simulation, the impact of restrictions on the maximum number of full- and half-sibs selected for males and females on the level of inbreeding and genetic gain of the herd. Data came from real populations A and B, composed of Pietrain and Landrace breed pigs, respectively. To generate the simulated populations, a Fortran-language simulator was developed using the (co)variances of the breeding values and the productive and reproductive rates obtained from populations A and B. Two data files were created. The first contained the pedigree of the previous 10 years, with 21,906 and 251,343 animals in populations A and B, respectively. The second included breeding values for age to reach 110 Kg body weight, backfat thickness, and feed conversion, for both populations; longissimus dorsi muscle depth, for population A only; and number of live piglets at the 5th day of life per farrowing, for population B only. Three scenarios were simulated with ten generations by varying the restrictions on the number of full- and half-sibs selected for males and females, with 30 replicates per generation and scenario. Regardless of the mating strategy used in a closed production unit, there is an increase in inbreeding levels. Inbreeding increases are larger in populations of smaller effective size. Restrictions on the number of full- and half-sibs selected are effective in reducing increments in inbreeding. Restriction to a maximum of two full-sibs and three half-sibs for males and three full sisters for females provided the highest genetic gains.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000700653
Editor: | Universidade Federal de Santa Maria
Relação: | 10.1590/0103-8478cr20180994
Formato: | text/html
Fonte: | Ciência Rural  v.49 n.7 2019
Fonte: | info:eu-repo/semantics/openAccess