Heritability

Genetic study of skin thickness and its association with postweaning growth in Nellore cattle: estimation of the genetic parameters

A. M. Maiorano, Oliveira, M. C. S., Cyrillo, J. N. S. G., Albuquerque, L. G., Curi, R. A., Silva, J. A. I. I. V., Maiorano, A. M., Oliveira, M. C. S., Cyrillo, J. N. S. G., Albuquerque, L. G., Curi, R. A., and Silva, J. A. I. I. V., Genetic study of skin thickness and its association with postweaning growth in Nellore cattle: estimation of the genetic parameters, vol. 15, p. -, 2016.

The objective of the present study was to estimate genetic parameters for skin thickness (ST) and postweaning weight gain (PWG550) in Nellore cattle. Records were obtained from 152,392 Nellore animals born between 2001 and 2011. ST was measured in the posterior region of the animal’s scapula with a millimeter caliper. The animals were assigned to different contemporary groups, formed on the basis of farm, year, sex, feeding regimen at weaning, date of weaning, feeding regimen at 450 days of age, and date of weighing at 450 days of age.

Influence of various quantitative trait loci (QTL) mapping methods on the mapping accuracy under varying heritability levels

C. F. Su, Liu, Z. B., and Li, Y. G., Influence of various quantitative trait loci (QTL) mapping methods on the mapping accuracy under varying heritability levels, vol. 14, pp. 13003-13012, 2015.

The study of quantitative trait effects is of great significance for molecular marker-assisted breeding. The accuracy of quantitative trait loci (QTL) mapping is the key factor affecting marker-assisted breeding, and is extremely significant. The effect of different heritability rates (10, 30, 50, 70, and 90%) on the accuracy of QTL mapping of five recombinant inbred lines (RILs) were analyzed via computer simulation. RILs display additive and epistatic genetic effects.

Analysis of genetic traits for drought tolerance in maize

R. W. Muhammad, Qayyum, A., Hamza, A., Ahmad, M. Q., Naseer, N. S., Liaqat, S., Ahmad, B., Malik, W., and Noor, E., Analysis of genetic traits for drought tolerance in maize, vol. 14, pp. 13545-13565, 2015.

Fifty-four genotypes of maize were crossed and evaluated in the field during the crop season in February 2012 under both normal and water stress conditions. To identify the major parameters responsible for variation among genotypes, single linkage cluster analysis and principle component analysis (PCA) were carried out. Thirteen characters were studied. The PCA showed that the first six components, with eigen values >1, contributed 82.30% of the variability among the genotypes under normal field irrigation conditions while other PCs (7-13) had eigen values less than 1.

Genetic association of productive and reproductive traits with stayability in Nellore cattle: analysis using Bayesian models

E. C. A. Rizzo, Neto, F. R. A., Diaz, I. D. P. S., Dias, M. M., Costa, R. B., Ventura, H. T., Oliveira, H. N., and Falcão, A. J. S., Genetic association of productive and reproductive traits with stayability in Nellore cattle: analysis using Bayesian models, vol. 14, pp. 14956-14966, 2015.

We evaluated the genetic association of growth traits [weight adjusted to 205 days of age (W205), 365 days of age (W365), and 550 days of age (W550); weight gain between 205 days of age and 365 days of age (WG1) and between 365 days of age and 550 days of age (WG2)] and reproductive traits [age at first calving (AFC); first calving interval (FCI)] with stayability in the herd (STAY), using Bayesian inference in linear and threshold models. We defined STAY as the probability of a cow calving three or more times before the age of 76 months, given that she had calved at least once.

Genetic parameters and mapping quantitative trait loci associated with tibia traits in broilers

B. N. N. Ragognetti, Stafuzza, N. B., Chud, T. C. S., Grupioni, N. V., Cruz, V. A. R., Peixoto, J. O., Nones, K., Ledur, M. C., Munari, D. P., and Silva, T. B. R., Genetic parameters and mapping quantitative trait loci associated with tibia traits in broilers, vol. 14, pp. 17544-17554, 2015.

Selection among broilers for performance traits is resulting in locomotion problems and bone disorders, once skeletal structure is not strong enough to support body weight in broilers with high growth rates. In this study, genetic parameters were estimated for body weight at 42 days of age (BW42), and tibia traits (length, width, and weight) in a population of broiler chickens. Quantitative trait loci (QTL) were identified for tibia traits to expand our knowledge of the genetic architecture of the broiler population.

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