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- Title
Effect of two phantom parent grouping strategies on the genetic evaluation of growth traits in Mexican Braunvieh cattle.
- Authors
Antonio Saavedra-Jiménez, Luis; Ramirez-Valverde, Rodolfo; Núñez-Domínguez, Rafael; Ruíz-Flores, Agustín; Guadalupe García-Muñiz, José; Nilforooshan, Mohammad Ali
- Abstract
The study aimed to compare two grouping strategies for unknown parents or phantom parent groups (PPG) on the genetic evaluation of growth traits for Mexican Braunvieh cattle. Phenotypic data included birth (BW), weaning (WW) and yearling (YW) weights. Pedigree included 57,341 animals, fhe first strategy involved 12 PPG (G12) based on the birth year of the unknown parent's progeny and the sex of the unknown parent, while the second involved 24 PPG (G24) based on the birth year of the unknown parent's progeny and 4-selection pathways, fhe animal models included fixed effects and the random direct additive genetic effect; WW also included random maternal genetic and maternal permanent environmental effects. Product-moment correlations between EBV from GO (no PPG) and G12 were 0.96, 0.77 and 0.69 for BW, WW and YW, respectively, and between EBV from GO and G24 were 0.91, 0.54, and 0.53, respectively. Corresponding rank correlations between GO and G12 were 0.94, 0.77, and 0.72, and between GO and G24 were 0.89, 0.61, and 0.60. Genetic trends showed a base deviation from the genetic trend of GO, except for B W of G12. The results did not support the use of the two grouping strategies on the studied population and traits, and further research is required. Introducing PPG to the model, enough phenotype contribution from descendants to PPG, and avoiding collinearity between PPG and fixed effects are important. Genetic groups should reflect changes in the genetic structure of the population to the unknown parents, including different sources of genetic materials, and changes made by selection over time.
- Subjects
CHILD care workers; FIXED effects model; CATTLE
- Publication
Revista Mexicana de Ciencias Pecuarias, 2021, Vol 12, Issue 3, p878
- ISSN
2007-1124
- Publication type
Article
- DOI
10.22319/rmcp.v12i3.5562