Genetic parameters and accuracy of traditional and genomic breeding values for eye pigmentation, hair coat and breed standard in Hereford and Braford cattle

Reimann, F. A.; Boligon, Arione Augusti; Campos, Gabriel Soares; Cardoso, Leandro Lunardini; Junqueira, Vinícius Silva; Cardoso, F. F.

doi:10.1016/j.livsci.2018.04.007

Cited by 12 publications

(5 citation statements)

References 29 publications

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“…The genetic model and statistical analysis method based on the mixed linear model can easily solve this problem even with a large population size, a complex population structure and unbalanced observed data [46,47]. With the development of computational methods and technology, a mixed linear model approach has become the main method of genetic evaluation and has been widely used in crop [48,49], tree [50,51] and animal [52,53] breeding. Breeding value, also known as additive effect value, is an important parameter in forest selection and breeding.…”

Section: Introductionmentioning

confidence: 99%

Variation and Genetic Parameters of Leaf Morphological Traits of Eight Families from Populus simonii × P. nigra

Ren

Wang

et al. 2020

Forests

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Leaf morphology in Populus L. varies extensively among sections, species and clones under strong genetic control. P. nigra L. (section Aigeiros), with large and triangular leaves, is a commercial forest tree of economic importance for fast growth and high yield in Europe. P. simonii Carr. (section Tacamahaca) with small land rhomboid ovate leaves performs cold and dry resistance/tolerance in the semi-arid region of Northern China. Leaf morphological traits could be used as early indicators to improve the efficiency of selection. In order to investigate the genetic variation pattern of leaf morphology traits, estimate breeding values (combining ability), as well as evaluate crossing combinations of parents, 1872 intersectional progenies from eight families (P. simonii × P. nigra) and their parents were planted with cuttings for the clonal replicate field trial in Northern China. Four leaf size traits (area, perimeter, length, width) and roundness were measured with leaf samples from the 1-year-old clonal plantation. Significant differences regarding leaf traits were found between and among three female clones of P. simonii from Inner Mongolia, China and six male clones of P. nigra from Casale Monferrato, Italy. The genetic variation coefficient, heritability and genetic variance component of most traits in male parents were greater than these of female parents. Heritability estimates of male and female parents were above 0.56 and 0.17, respectively. Plentiful leaf variations with normal and continuous distributions exited in the hybrid progenies among and within families with the genetic variation coefficient and heritability above 28.49 and 0.24, respectively. Heritability estimates showed that leaf area was the most heritable trait, followed by leaf width. The breeding value ranking of parents allowed us to select the parental clones for new crosses and extend the mating design. Two male parental clones (N430 and N429) had greater breeding values (general combining ability, GCA) of leaf size traits than other clones. The special combining ability (SCA) of the crossing combination between P. simonii cl. ZL-3 and P. nigra cl. N430 was greater than that of others. Eight putatively superior genotypes, most combined with the female parental clone ZL-3, can be selected for future testing under near-commercial conditions. Significant genetic and phenotypic correlations were found between five leaf morphology traits with the coefficients above 0.9, except for leaf roundness. The results showed that leaf morphology traits were under strong genetic control and the parental clones with high GCA and SCA effects could be utilized in heterosis breeding, which will provide a starting point for devising a new selection strategy of parents and progenies.

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Section: Introductionmentioning

confidence: 99%

Variation and Genetic Parameters of Leaf Morphological Traits of Eight Families from Populus simonii × P. nigra

Ren

Wang

et al. 2020

Forests

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“…Similarly, Boligon et al (2016) obtained a heritability of 0.15 for BQ score using part of the same population included in the present study. However, Faria et al (2009) and Reimann et al (2018) reported heritability of 0.21 and 0.32, respectively, for visual score of racial traits at yearling in Nelore and taurine breeds.…”

Section: Discussionmentioning

confidence: 99%

Genetic analysis of growth, visual scores, height, and carcass traits in Nelore cattle

Silveira

Schmidt

Campos

et al. 2021

Animal Science Journal

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Covariance components were estimated for growth traits (BW, birth weight; WW, weaning weight; YW, yearling weight), visual scores (BQ, breed quality; CS, conformation; MS, muscling; NS, navel; PS, finishing precocity), hip height (HH), and carcass traits (BF, backfat thickness; LMA, longissimus muscle area) measured at yearling. Genetic gains were obtained and validation models on direct and maternal effects for BW and WW were fitted. Genetic correlations of growth traits with CS, PS, MS, and HH ranged from 0.20 AE 0.01 to 0.94 AE 0.01 and were positive and low with NS (0.11 AE 0.01 to 0.20 AE 0.01) and favorable with BQ (0.14 AE 0.02 to 0.37 AE 0.02). Null to moderate genetic correlations were obtained between growth and carcass traits. Genetic gains were positive and significant, except for BW. An increase of 0.76 and 0.72 kg is expected for BW and WW, respectively, per unit increase in estimated breeding value (EBV) for direct effect and an additional 0.74 and 1.43, respectively, kg per unit increase in EBV for the maternal effect.Monitoring genetic gains for HH and NS is relevant to maintain an adequate body size and a navel morphological correction, if necessary. Simultaneous selection for growth, morphological, and carcass traits in line with improve maternal performance is a feasible strategy to increase herd productivity.

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“…For breed traits score in Guzerá cattle, assigned from 1 to 4 and evaluated with a threshold model, Abreu et al (2018) also estimated heritability of 0.34. For breed standard of Hereford and Braford animals, evaluated by scores ranging from 1 to 5, Reimann et al (2018) reported heritability of 0.33±0.02, using threshold model. In general, BTW and BTY in the studied population showed low variability in its phenotypic expression, which may justify, in part, the reduced genetic variability estimated for the trait and, consequently, the low heritability.…”

Section: Discussionmentioning

confidence: 99%

Genetic study of scores for limb conformation, breed traits, sexual traits, eye pigmentation, and navel size in Hereford and Braford cattle

Souza,

Silveira,

Teixeira

et al. 2024

Revista Brasileira De Zootecnia

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Hereford and Braford cattle were used to compare parameters and breeding values obtained using linear and threshold models for visual scores of limb conformation (LCW and LCY), breed traits (BTW and BTY), sexual traits (STW and STY), eye pigmentation (EPW and EPY), and navel size (NSW and NSY) at weaning and yearling, respectively. Additionally, principal component analysis was applied to investigate the relationship among the estimated breeding values. Higher direct heritability were estimated using the threshold model (ranging from 0.134±0.021 to 0.194±0.023) compared with the linear model (ranging from 0.085±0.008 to 0.120±0.009). Rank correlations between breeding values predicted using linear and threshold models ranged from 0.61 to 0.88 (LCW), 0.53 to 0.91 (BTW), 0.66 to 0.87 (STW), 0.80 to 0.96 (EPW), 0.87 to 0.95 (NSW), 0.70 to 0.92 (LCY), 0.49 to 0.93 (BTY), 0.56 to 0.95 (STY), 0.88 to 0.97 (EPY), and 0.80 to 0.95 (NSY). The low genetic variability of the studied traits suggests a small genetic gain in the morphology and adaptation. According to the results obtained in the rank correlation, the percentage of coincident animals and the cross-validation analyses, it is recommended to use the threshold model for limb conformation, breed, and sexual traits. For eye pigmentation and navel size scores, both models can be used. In practical terms, the producer will be able to carry out his own selection, considering other traits that are not currently incorporated in the selection indexes, but that can lead to simultaneous gains in the morphology and adaptation of Hereford and Braford cattle.

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Genetic parameters and accuracy of traditional and genomic breeding values for eye pigmentation, hair coat and breed standard in Hereford and Braford cattle

Cited by 12 publications

References 29 publications

Variation and Genetic Parameters of Leaf Morphological Traits of Eight Families from Populus simonii × P. nigra

Variation and Genetic Parameters of Leaf Morphological Traits of Eight Families from Populus simonii × P. nigra

Genetic analysis of growth, visual scores, height, and carcass traits in Nelore cattle

Genetic study of scores for limb conformation, breed traits, sexual traits, eye pigmentation, and navel size in Hereford and Braford cattle

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