| Full text | |
| Author(s): |
Freitas, L. A.
[1]
;
Savegnago, R. P.
[2]
;
Oliveira, E. J.
[3]
;
Paz, C. C. P.
[3, 2]
;
Munari, D. P.
[1]
Total Authors: 5
|
| Affiliation: | [1] Univ Estadual Paulista, Fac Ciencias Agr & Vet, Via Acesso Prof Paulo Donato Castellane S-N, BR-14884900 Jaboticabal, SP - Brazil
[2] Inst Zootecnia, Ctr APTA Bovinos Corte, Rodovia Carlos Tonani, Km 94, BR-14174000 Sertaozinho, SP - Brazil
[3] Univ Sao Paulo, Fac Med Ribeirao Preto, Dept Genet, BR-14049900 Ribeirao Preto, SP - Brazil
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | Small Ruminant Research; v. 174, p. 57-61, MAY 2019. |
| Web of Science Citations: | 0 |
| Abstract | |
The objectives of this study were to estimate the genetic parameters for body weight (BW), packed cell volume (PCV) and fecal egg count (FEC) in Santa Ines sheep using random regression models in order to indicate which traits could be used as selection criteria and to explore the additive genetic pattern of the animals using cluster analysis in order to select animals that attend the breeding goals. The dataset had 4608 records. The covariance components for traits were estimated using the restricted maximum likelihood (REML) method, by means of single trait random regression models. The cluster analyzes was performed in the software R. The random regression models using Legendre polynomial with 3 parameters (intercept, linear and quadratic) to model the genetic additive effect and permanent environment presented the best fit for the three traits. Heritability estimates for BW ranged from 0.02 (0.02) to 0.40 (0.03). The selection of these animals for PCV and FEC would result in low efficiency due to the low estimates of heritability (0.01 +/- 0.01-0.18 +/- 0.02). Through of the non-hierarchical cluster analysis, only one group presented a genetic profile indicated for selection. It is recommended the selection of animals based on BW (h(2) = 0.12 +/- 0.05) and PCV (h(2) = 0.18 +/- 0.03) from 180 days of age, because although the low heritability estimate, the obtained gains will be permanent. (AU) | |
| FAPESP's process: | 16/10583-1 - Genetic evaluation of growth characteristics and resistance to worms in sheep breed Santa Inês using random regression models and cluster analysis |
| Grantee: | Luara Afonso de Freitas Januário |
| Support Opportunities: | Scholarships in Brazil - Master |
| FAPESP's process: | 12/15982-0 - Selection criteria for economic importance traits in Santa Inês sheep |
| Grantee: | Claudia Cristina Paro de Paz |
| Support Opportunities: | Regular Research Grants |