The harmonization of rabbit carcass criteria is a result an international work. lts task was to specify the main traits be considered from birth animal analysis, define these with enough accuracy and propose common terminology. work concerns: 1-growth, consumption breeding measurements, preslaughter handling slaughter processing, 2- dressing out percentage 3- measurements or prediction chilled reference composition. proposal described in this updates former published 1993, has status...

Microbiome and omics datasets are, by their intrinsic biological nature, of high dimensionality, characterized counts large numbers components (microbial genes, operational taxonomic units, RNA transcripts, etc.). These data are generally regarded as compositional since the total number identified within a sample is irrelevant. The central concept in analysis logratio transformation, simplest being additive logratios with respect to fixed reference component. A full set not isometric, that...

Frequentist and Bayesian approaches to scientific inference in animal breeding are discussed. Routine methods (selection index, BLUP, ML, REML) presented under the hypotheses of both schools inference, their properties examined cases. The approach is discussed cases which prior information available, available certain hypotheses, vague, there no information. prediction genetic values parameters presented. Finally, frequentist compared from a theoretical practical point view. Some problems...

A profit function was designed for an industrial commercial rabbitry with the most common management in rabbit production. The incomes, costs, and were calculated economic weights of traits estimated. variable costs (feeding, artificial insemination, health replacement) represented 62% total fixed (labour, utilities, amortisation administration) 38% costs. Major feeding fattening kits labour cost, at 26% 18% respectively. feed conversion rate during (–20.2 €/[g feed/g liveweight]), number...

In recent years, there has been an increasing interest in the genetic determination of environmental variance. case litter size, variance can be related to capacity animals adapt new conditions, which improve animal welfare. We developed a ten-generation divergent selection experiment on selected one line rabbits for size homogeneity and heterogeneity by measuring intra-doe phenotypic proved that is genetically determined modified selection. Response was 4.5% original per generation. Litter...

Understanding how the host's microbiome shapes phenotypes and participates in host response to selection is fundamental for evolutionists animal plant breeders. Currently, resilience considered a critical step improving sustainability of livestock systems. Environmental variance (V E), within-individual trait, has been successfully used as proxy resilience. Selection reduced V E could effectively shift gut composition; reshape inflammatory response, triglyceride, cholesterol levels; drive...

Abstract Background Longevity and resilience are two fundamental traits for more sustainable livestock production. These closely related, as resilient animals tend to have longer lifespans. An interesting criterion increasing longevity in rabbit could be based on the information provided by its gut microbiome. The microbiome is essential regulating health plays crucial roles development of immune system. aim this research was investigate if with different longevities microbial profiles. We...

This work aims to compare different nonlinear functions for describing the growth curves of Nelore females. The curve parameters, their (co)variance components, and environmental genetic effects were estimated jointly through a Bayesian hierarchical model. In first stage hierarchy, 4 compared: Brody, Von Bertalanffy, Gompertz, logistic. analyses carried out using 3 data sets check goodness fit while having animals with few records. Three assumptions about SD fitting errors considered:...

Abstract Model‐based accuracy, defined as the theoretical correlation between true and estimated breeding value, can be obtained for each individual a function of its prediction error variance (PEV) inbreeding coefficient F, in BLUP, GBLUP SSGBLUP genetic evaluations. However, computational convenience, is often ignored two places. First, computation reliability = 1‐PEV/(1 + F). Second, set‐up, using Henderson's rules, inverse pedigree‐based relationship matrix A . Both approximations have...

The objectives of this research were to evaluate gender differences and selection on body weight as they affect growth curves chickens. Marginal posterior densities curve parameters studied by Gibbs sampling 10,671 male female chickens originating from five lines. Line X-+ was selected low at 8 wk (BW8) high 36 (BW36), line X+- BW8 BW36, X++ X-- BW8, X00 an unselected control line. Growth modeled a Gompertz function. Heritabilities genetic correlations among the estimated. drawn for sexual...

The effect of selection for growth rate on carcass and meat quality was assessed by comparing selected control populations rabbits measured at the same stage maturity slaughtered 9 13 wk age. Embryos belonging to Generation 7 were frozen, thawed, implanted in does produce group. group formed from offspring embryos 7. Selected animals 18 (S) compared with contemporary (C). Carcasses dissected according World Rabbit Science Association recommended practices. When similar degrees maturity, did...