Correction factors for weight productive traits up to 
weaning in the <i>Bruna dels Pirineus</i> beef cattle breed

Casellas, J.; Piedrafita, J.

doi:10.1051/animres:2002003

Cited by 6 publications

(3 citation statements)

References 29 publications

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“…Average BWT (45.6 kg) and WWT (235.5 kg) were close to ones reported by Casellas and Piedrafita (2002) and Quintanilla et al (1999) in the same breed and similar to the performances reported in other Spanish beef cattle breeds such as Asturiana de los Valles (Mené ndez- Buxadera et al, 2008) and Pirenaica (Villalba et al, 2000). Focusing on international and worldwide distributed beef breeds, our weight phenotypes were comparable with the averages Note that the model for WWT included both paternal imprinting and the effect of the Y chromosome, whereas the model for BWT did not account for paternal imprinting.…”

Section: Discussionsupporting

confidence: 86%

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Sources of sire-specific genetic variance for birth and weaning weight in Bruna dels Pirineus beef calves

Fina

Varona

Piedrafita

et al. 2012

Animal

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This research investigated two sources of sire-specific genetic effects on the birth weight (BWT) and weaning weight (WWT) of Bruna dels Pirineus beef calves. More specifically, we focused on the influence of genes located in the non-autosomal region of the Y chromosome and the contribution of paternal imprinting. Our analyses were performed on 8130 BWT and 1245 WWT records from 12 and 2 purebred herds, respectively, they being collected between years 1986 and 2010. All animals included in the study were registered in the Yield Recording Scheme of the Bruna dels Pirineus breed. Both BWT and WWT were analyzed using a univariate linear animal model, and the relevance of paternal imprinting and Y chromosome-linked effects were checked by the deviance information criterion (DIC). In addition to sire-specific and direct genetic effects, our model accounted for random permanent effects (dam and herd-year-season) and three systematic sources of variation, that is, sex of the calf (male or female), age of the dam at calving (six levels) and birth type (single or twin). Both weight traits evidenced remarkable effects from the Y chromosome, whereas paternal imprinting was only revealed in WWT. Note that differences in DIC between the preferred model and the remaining ones exceed 39 000 and 2 800 000 DIC units for BWT and WWT, respectively. It is important to highlight that Y chromosome accounted for ,2% and ,6% of the total phenotypic variance for BWT and WWT, respectively, and paternal imprinting accounted for ,13% of the phenotypic variance for WWT. These results revealed two relevant sources of sire-specific genetic variability with potential contributions to the current breeding scheme of the Bruna dels Pirineus beef cattle breed; moreover, these sire-specific effects could be included in other beef cattle breeding programs or, at least, they must be considered and appropriately analyzed.Keywords: Bruna dels Pirineus, sire-specific genetic variance, birth weight, weaning weight ImplicationsDespite the fact that sire-specific genetic effects are typically ignored in genetic evaluation models, their real impact remains almost unknown in livestock species. Both Y chromosomerelated effects and paternal imprinting effects were evaluated on birth and weaning weight (WWT) in the Bruna dels Pirineus beef cattle breed. Whereas Y chromosome effects influenced both traits and accounted for ,2% and 6% of the phenotypic variance, respectively, paternal imprinting effects restricted to WWT (,13% of the phenotypic variability). Our results highlighted the relevance of these sire-specific sources of variation in beef cattle, and provided relevant information to optimize genetic evaluation models for weight traits.

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Section: Discussionsupporting

confidence: 86%

“…Systematic effects accounted for the age of the dam at calving with six categories as defined by Casellas and Piedrafita (2002) …”

Section: Methodsmentioning

confidence: 99%

Sources of sire-specific genetic variance for birth and weaning weight in Bruna dels Pirineus beef calves

Fina

Varona

Piedrafita

et al. 2012

Animal

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“…Moreover, the reduced number of animals without known ancestors in some years does not allow the use of fixed genetic groups and requires a random approach for the grouping strategy [3], an important assumption in our approach. Average weaning weight was 243.2 kg, a value close to the ones reported by Quintanilla et al [23] and Casellas and Piedrafita [2] in the Bruna dels Pirineus breed and comparable with the results obtained in Brown Swiss and Pirenaica [31]. The ratios of the variance components provided heritability estimates ranging between 0.213 and 0.256, similar to the values reported by Quintanilla et al [23] in the same breed, and coefficients of permanent environment lower than 0.10, all of them comparable with the results of Quintanilla et al [23].…”

Section: Discussionsupporting

confidence: 86%

Bayes factor for testing between different structures of random genetic groups: A case study using weaning weight inBruna dels Pirineusbeef cattle

2007

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-The implementation of genetic groups in BLUP evaluations accounts for different expectations of breeding values in base animals. Notwithstanding, many feasible structures of genetic groups exist and there are no analytical tools described to compare them easily. In this sense, the recent development of a simple and stable procedure to calculate the Bayes factor between nested competing models allowed us to develop a new approach of that method focused on compared models with different structures of random genetic groups. The procedure is based on a reparameterization of the model in terms of intraclass correlation of genetic groups. The Bayes factor can be easily calculated from the output of a Markov chain Monte Carlo sampling by averaging conditional densities at the null intraclass correlation. It compares two nested models, a model with a given structure of genetic groups against a model without genetic groups. The calculation of the Bayes factor between different structures of genetic groups can be quickly and easily obtained from the Bayes factor between the nested models. We applied this approach to a weaning weight data set of the Bruna dels Pirineus beef cattle, comparing several structures of genetic groups, and the final results showed that the preferable structure was an only group for unknown dams and different groups for unknown sires for each year of calving.Bayes factor / genetic groups / beef cattle / weaning weight / Bruna dels Pirineus

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Factors influencing length of productive life and replacement rates in the Bruna dels Pirineus beef breed

Pujol¹,

Puig

Ducrocq

et al. 2004

Anim. Sci.

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An analysis of the length of productive life in the Bruna dels Pirineus beef breed was performed with a non-parametric approach giving an average value of 9 years of productive life, and a corresponding replacement rate of 11%. Using a proportional hazards model stratified by herd, the influence of calf birth weight and weight gain until weaning, calving difficulty, calving interval and age at first calving on length of productive life were studied. Two models were explored: the first one included time-dependent variables taking the current value of the covariate at each calving date, while the second one also comprised time-dependent interactions between the value of the covariate of the current calving and its mean value during the last (up to) three previous calvings. Results from the first model showed that the risk of culling increases with very high ages at first calving, increasing calving difficulties, very large calf birth weights, very small weight gains until weaning and very long calving intervals. Furthermore, results from the second model showed that these increases also depend upon a sequence of values for the same covariate in previous calvings. Finally, these higher risks of culling implied lower survival functions that increased replacement rates but only slightly decreased average performances.

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Correction factors for weight productive traits up to weaning in the Bruna dels Pirineus beef cattle breed

Cited by 6 publications

References 29 publications

Sources of sire-specific genetic variance for birth and weaning weight in Bruna dels Pirineus beef calves

Sources of sire-specific genetic variance for birth and weaning weight in Bruna dels Pirineus beef calves

Bayes factor for testing between different structures of random genetic groups: A case study using weaning weight inBruna dels Pirineusbeef cattle

Factors influencing length of productive life and replacement rates in the Bruna dels Pirineus beef breed

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