The purpose of this study was to compare estimates genetic parameters for sequential growth beef cattle using two models and data sets. Growth curves Nellore were analyzed body weights measured at ages 1 (birth weight) 733 d. Two samples created, one with 71,867 records sampled from all herds (MISS), the other 74,601 no missing traits (NMISS). Records preadjusted a fixed age by multiple-trait model (MTM), which included effects contemporary group, dam class, additive direct, maternal,...

In recent years, there has been increased interest in the study of molecular processes that affect semen traits. this study, our aim was to identify quantitative trait loci (QTL) regions associated with four traits (motility, progressive motility, number sperm cells per ejaculate and total morphological defects) two commercial pig lines (L1: Large White type L2: Landrace type). Since animals both phenotypes genotypes relatively small dataset, we conducted a weighted single-step genome-wide...

Reproductive traits such as number of stillborn piglets (SB) and teats (NT) have been evaluated in many genome-wide association studies (GWAS). Most these GWAS were performed under the assumption that normally distributed. However, both SB NT are discrete (e.g. count) variables. Therefore, it is necessary to test for better fit other appropriate statistical models based on distributions. In addition, although performed, biological meaning identified candidate genes, well their functional...

Seventy-two pigs of three genetic groups (Brazilian indigenous breed Piau, Commercial line and Crossbred) both sexes were slaughtered at four live weights (30, 60, 90 120 kg). Intramuscular fat (IMF) content in Longissimus dorsi muscle each animal was extracted correlated with candidate gene mRNA expression (ATN1, EEF1A2, FABP3, LDLR, MGP, OBSCN, PDHB, TRDN RYR1). Within slaughter weight kg, Piau Crossbred showed higher IMF (p < 0.05) than commercial animals, 2.48, 2.08 1.00% respectively....

Linkage disequilibrium (LD) across the genome is critical information for association studies and genomic selection because it determines number of SNP that should be used a successful analysis selection. also influences accuracy breeding values. Some have demonstrated in strong LD are organized into discrete blocks haplotypes, which separated by possibly hot spots recombination. To reduce markers needed to genotyped mapping, set can selected labels all haplotype blocks. We estimated LD,...

In the era of genome-wide selection (GWS), genotype-by-environment (G×E) interactions can be studied using genomic information, thus enabling estimation SNP marker effects and prediction estimated breeding values (GEBV) for young candidates in different environments. Although G×E studies pigs are scarce, use artificial insemination has enabled distribution genetic material from sires across multiple Given relevance reproductive traits, such as total number born (TNB) variation environmental...

The objective of this study was to estimate the heritability and genetic, phenotypic, environmental correlations between 305-day milk yield (305MY), age at first calving (AFC), interval (CI) dry period length (DPL), as well compare productive reproductive performances several groups Girolando cows during their first, second third parturitions in Brazil. Genetic parameters were estimated using uni- bi-trait analyses via restricted maximum likelihood (REML). Heritability estimates similar...

Traditional breeding programs consider an average pairwise kinship between sibs. Based on pedigree information, the relationship matrix is used for genetic evaluations disregarding variation due to Mendelian sampling. Therefore, inbreeding and coefficients are either over or underestimated resulting in reduction of accuracy progress. Single nucleotide polymorphism (SNPs) can be estimate individual more accurately. The aim this study was optimize selection markers determine required number...

Summary The associations of leptin ( LEP ) gene polymorphisms C798T, T2411C, T3266G and T3469C with production traits were investigated in a F2 pig population produced by divergent crosses. statistical model included genotype, sex, batch genotype sex interaction as fixed effects sire random effect. Polymorphism C798T was associated variation total teat number (p &lt; 0.02) left 0.03), polymorphism weight at 21 days 42 0.05), 63 77 age 0.04) well feed intake 0.01), average daily gain...

Test-day milk yield records of 11,023 first-parity Holstein cows were used to estimate genetic parameters for during different lactation periods. (Co)variance components estimated using two random regression models, RRM1 and RRM2, the restricted maximum likelihood method, compared by ratio test. Additive variances determined additive permanent environmental RRM2 described, Wilmink function. Residual variance was constant throughout models. The heritability estimates obtained (0.34 0.56)...

In order to characterize the expression of genes associated with immune response mechanisms mastitis, we quantified relative IL-2, IL-4, IL-6, IL-8, IL-10, IFN-γ and TNF- α in milk cells healthy cows clinical mastitis. Total RNA was extracted from six Black White Holstein (BW) Gyr cows, including three animals without mastitis per breed. Gene analyzed by real-time PCR. IL-10 gene higher group BW compared free infection both breeds (p < 0.05). It also 0.001), but it not significant when were...

Genomic selection and genomic wide association studies are widely used methods that aim to exploit the linkage disequilibrium (LD) between markers quantitative trait loci (QTL). Securing a sufficiently large set of genotypes phenotypes can be limiting factor may overcome by combining data from multiple breeds or using crossbred information. However, estimated effect marker in one breed only useful for animals another if there is correspondence phase QTL across breeds. Using five pure pig...

Annual genetic trends and selection differentials for 305-day milk yield (305MY), age at first calving (AFC), interval (FCI) were estimated by four paths [sires of bulls (SB), dams (DB), sires cows (SC), (DC)] Girolando dairy cattle in Brazil. A total 12,739 lactation records obtained from the Brazilian Breeders Association with period 2000 to 2011. Two periods involved: first, 1979 1996, corresponding formation expansion herd, second, 1997 2007, characterized implementation breeding program...

Selection for feed efficiency (FE) is a strategy to reduce the production costs per unit of animal product, which one major objectives current breeding programs. In pig breeding, selection FE and other traits traditionally takes place based on purebred (PB) performance at nucleus level, while pork typically makes use crossbred animals (CB). The success this selection, therefore, depends genetic correlation between PB CB (rpc) (rg) that are currently under selection. Different being used...

We aimed to estimate genetic parameters for semen quality and quantity traits as well within-boar variation of these evaluate their inclusion in breeding goals. Genetic were estimated within line using a multiple-trait (4 × 4) repeatability animal model fitted 5 pig lines, considering 4 traits: sperm motility (MOT), progressive (PROMOT), log-transformed number cells per ejaculate (lnN), total morphological abnormalities (ABN). The was analyzed based on (2 2) approach SD average (AVG)...

Feed efficiency (FE) is one of the most important traits in pig production. However, it difficult and costly to measure it, limiting collection large amount data for an accurate selection better FE. Therefore, identification single-nucleotide polymorphisms (SNPs) associated with FE-related be used genetic evaluation great interest breeding programs increasing prediction accuracy progress these traits. The objective this study was identify SNPs significantly traits: average daily gain (ADG),...

Brazilian naturalized goat breeds are adapted to the semiarid conditions prevalent in Northeast region of country (which has largest heard) and represent an as yet uninvestigated source genetic diversity. Currently, imported crossed with breeds, endangering potential breeds. We used 11 microsatellite markers determine diversity among (non-naturalized) dairy Alpine Saanen goats Moxotó goats. genotyped 292 from three herds (one private, one University Minas Gerais conservation herd Embrapa...

This study aimed to compare two different Genome-Wide Selection (GWS) methods (Ridge Regression BLUP − RR-BLUP and Bayesian LASSO BL) predict the genomic estimated breeding values (GEBV) of four phenotypes, including boar taint compounds, i.e., concentrations androstenone (andro) skatole (ska), carcass traits, backfat thickness (fat) loin depth (loin), which were measured in a commercial male pig line. Six hundred twenty-two boars genotyped for 2,500 previously selected single nucleotide...

Carcass and ham quality characteristics of pig populations divided by harvest weights — HW (130 160 kg) were evaluated to determine the effects gender (barrows gilts) distinct genetic groups purebred (DUDU) crossbred Duroc (DULA, DUWI DULL) as well Large White (WIWI) on suitability for use in dry-cured production. At 130 kg, DUDU pigs yielded highest fat thickness (P < 0.01) an intramuscular content (IMF) 3.15% Semimembranosus muscle (SM). also had a SM pHu 5.7. This group met specifications...

The cattle tick is a parasite that adversely affects livestock performance in tropical areas. Although countries such as Australia and Brazil have developed genetic evaluations for resistance, these not considered genotype by environment (G*E) interactions. Genetic gains could be affected, since breedstock comparisons are environmentally dependent on the presence of G*E interactions, particularly if residual variability also heterogeneous across environments. objective this study was to...