Vincent Ducrocq
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View article: Erosion of estimated genomic breeding values with generations is due to long distance associations between markers and QTL
Erosion of estimated genomic breeding values with generations is due to long distance associations between markers and QTL Open
Background Most validation studies of genomic evaluations on candidates (prior to observing phenotypes) present inflation of their predicted breeding values, i.e., regression coefficients of their later observed phenotypes on the early pre…
View article: Developing flexible models for genetic evaluations in smallholder crossbred dairy farms
Developing flexible models for genetic evaluations in smallholder crossbred dairy farms Open
The productivity of smallholder dairy farms is very low in developing countries. Important genetic gains could be realized using genomic selection, but genetic evaluations need to be tailored for lack of pedigree information and very small…
View article: Methods to Estimate Erosion Factors of Genomic Breeding Values of Candidates due to Long-Distance Linkage Disequilibrium
Methods to Estimate Erosion Factors of Genomic Breeding Values of Candidates due to Long-Distance Linkage Disequilibrium Open
International audience
View article: Genetic relationships between weight loss in early lactation and daily milk production throughout lactation in Holstein cows
Genetic relationships between weight loss in early lactation and daily milk production throughout lactation in Holstein cows Open
After calving, high-yielding dairy cows mobilize body reserves for energy, sometimes to the detriment of health and fertility. This study aimed to estimate the genetic correlation between body weight loss until nadir and daily milk product…
View article: Validation of single-step genomic BLUP random regression test-day models and SNP effects analysis on milk yield in French Saanen goats
Validation of single-step genomic BLUP random regression test-day models and SNP effects analysis on milk yield in French Saanen goats Open
The shape of the lactation curve is linked to an animal's health, feed requirements, and milk production throughout the year. Random regression models (RRM) are widely used for genetic evaluation of total milk production throughout the lac…
View article: 272. Accuracy of prediction for a genomic evaluation in rotational crossbreeding scheme (Montbéliarde × Holstein × Red Danish)
272. Accuracy of prediction for a genomic evaluation in rotational crossbreeding scheme (Montbéliarde × Holstein × Red Danish) Open
In recent years, crossbreeding strategy has grown in dairy cattle farms at an international level. Breeders are interested in keeping crossbred cows in their herd both to combine the strengths of the pure breeds, compensate for their weakn…
View article: 807. Inclusion of average rainfall in genetic evaluation of SA Holsteins to mitigate genotype by environment interaction
807. Inclusion of average rainfall in genetic evaluation of SA Holsteins to mitigate genotype by environment interaction Open
International audience
View article: 458. Challenges on construction and use of female reference populations for genomic selection under Indian smallholder systems
458. Challenges on construction and use of female reference populations for genomic selection under Indian smallholder systems Open
International audience
View article: 296. Genetic correlations among longevity, fertility, udder health and type traits including or not genomic information
296. Genetic correlations among longevity, fertility, udder health and type traits including or not genomic information Open
International audience
View article: 52. Genetic relationships between weight loss in early lactation and daily milk production until 305 days in Holstein cows
52. Genetic relationships between weight loss in early lactation and daily milk production until 305 days in Holstein cows Open
International audience
View article: 666. Comparison of random regression test-day models for production traits of South African Jersey Cattle
666. Comparison of random regression test-day models for production traits of South African Jersey Cattle Open
International audience
View article: 73. Novel genetic parameters to improve gRFI in dairy cattle using big data from multiple lactations and countries
73. Novel genetic parameters to improve gRFI in dairy cattle using big data from multiple lactations and countries Open
International audience
View article: Comparison of fixed and random regression models for the analysis of milk production traits in South African Holstein dairy cattle under two production systems
Comparison of fixed and random regression models for the analysis of milk production traits in South African Holstein dairy cattle under two production systems Open
International audience
View article: Factors affecting true and functional productive lifespan in Italian Holstein-Friesian cows
Factors affecting true and functional productive lifespan in Italian Holstein-Friesian cows Open
The identification of factors affecting longevity in dairy cows is of great importance to improve their length of productive life. Cows can be replaced for poor milk production (i.e. true productive lifespan, TPL) or other reasons than pro…
View article: Accounting for heterogeneity of data in implementing genomic selection models applicable to crossbred cattle in India
Accounting for heterogeneity of data in implementing genomic selection models applicable to crossbred cattle in India Open
International audience
View article: A Phenotypic and Genetic Study of Semen Production and Semen Quality Traits Among Young and Adult Cattle Bulls in India
A Phenotypic and Genetic Study of Semen Production and Semen Quality Traits Among Young and Adult Cattle Bulls in India Open
Semen characteristics of 97,112 ejaculates from 399 adult bulls of 2 exotic breeds, 2 indigenous breeds and crossbred sub-populations with 50% and 75% of exotic inheritance, and of 3,293 ejaculates from 292 test bulls were analysed. The tr…
View article: Combining datasets in a dynamic residual feed intake model and comparison with linear model results in lactating Holstein cattle
Combining datasets in a dynamic residual feed intake model and comparison with linear model results in lactating Holstein cattle Open
A new method to estimate residual feed intake (RFI) was recently developed based on a multi-trait random regression model. This approach deals with the dynamic nature of the lactation, which is in contrast with classical linear approaches.…
View article: An approach to reduce computing time in multi-trait single-step evaluations
An approach to reduce computing time in multi-trait single-step evaluations Open
Multi-trait (MT) single-step (SS) evaluations can be very time-consuming, in particular because of slow convergence. An alternative consists in first running univariate SS evaluations for a limited number of iterations in order to provide …
View article: Genomic evaluation of milk yield in a smallholder crossbred dairy production system in India
Genomic evaluation of milk yield in a smallholder crossbred dairy production system in India Open
Background India is the largest milk producer globally, with the largest proportion of cattle milk production coming from smallholder farms with an average herd size of less than two milking cows. These cows are mainly undefined multi-gene…
View article: An approach to reduce computation time in multi-trait single-step evaluations.
An approach to reduce computation time in multi-trait single-step evaluations. Open
Case 1-approach 2 Case 2-approach 2 Case 3-approach 2 Correlations between GEBVs compared to final GEBVs (iteration 3000-approach 1) for each case (points below 0.9 are not shown, red vertical lines show start of step 2 for Approach 2 = it…
View article: Invited review: Disentangling residual feed intake—Insights and approaches to make it more fit for purpose in the modern context
Invited review: Disentangling residual feed intake—Insights and approaches to make it more fit for purpose in the modern context Open
Residual feed intake (RFI) is an increasingly used trait to analyze feed efficiency in livestock, and in some sectors such as dairy cattle, it is one of the most frequently used traits. Although the principle for calculating RFI is always …
View article: Exploring underlying drivers of genotype by environment interactions in feed efficiency traits for dairy cattle with a mechanistic model involving energy acquisition and allocation
Exploring underlying drivers of genotype by environment interactions in feed efficiency traits for dairy cattle with a mechanistic model involving energy acquisition and allocation Open
Feed efficiency (FE) is a complex phenotype made up of multiple traits for which there is potential for substantial genotype by environment interaction (G × E). The objective of this study is to evaluate the extent of G × E for FE traits w…
View article: Estimation of genetic parameters for dairy traits and somatic cell score in the first 3 parities using a random regression test-day model in French Alpine goats
Estimation of genetic parameters for dairy traits and somatic cell score in the first 3 parities using a random regression test-day model in French Alpine goats Open
Lactation curve shape can affect an animal's health, feed requirements, and milk production throughout the year. We implemented a random regression model for the genetic evaluation of lactation curve shapes of dairy traits in French Alpine…