Effect of including relationships in the estimation of genetic parameters of beef calves

Article Abstract:

The influence of kinship on the estimation of calf birth weight, weight gain from parturition to weaning and weight on the 205th day was evaluated to determine the necessity of including the relationship matrix in genetic parameter estimation. Variances of the different factors affecting the calves' genotype and phenotype were calculated with and without the numerator relationship matrix factor in separate herds of Angus and Hereford cattle. Analysis of the variances indicated that in some cases, it was not necessary to include the kinship factor in the approximation of genetic parameters.

Measurement, Influence, Growth, Growth (Physiology), Heredity, Aberdeen-Angus cattle, Hereford cattle, Aberdeen Angus cattle

---

Estimates of repeatability and heritability of horn fly resistance in beef cattle

Article Abstract:

Heritability estimates for horn fly resistance in cattle were found to indicate the involvement of additive gene action. A moderately high overall repeatability estimate of .47 .05 supports that contention. Breed effects contributed a substantial amount of the variation in resistance, followed by sire/breed interaction, then residual error. Selection for horn fly resistance is therefore possible, although no physiological indicator of resistance has been found at present.

Research, Beef cattle, Flies, Diptera, Diseases and pests, Livestock

---

Estimation of direct and maternal heritability and genetic correlation for backfat and growth rate in swine using data from centrally tested Yorkshire boars

Article Abstract:

Data from centrally tested Yorkshire boars were used to estimate direct and maternal heritability and its genetic correlation with backfat and growth rate of swines. There is a moderate heritability for weight gain and high heritability for backfat. Simultaneous selection of both traits is effective in choosing superior boars from the population tested. Maternal effects were also found to be significant and must be considered to attain accurate breeding value estimates.

Genetic aspects, Swine, Swine breeding, Swine breeds

Similar abstracts:

• Abstracts: The role of mat-forming diatoms in the formation of Mediterranean sapropels. Early Oligocene initiation of North Atlantic deep water formation
• Abstracts: Conical dislocations in crumpling. Non-equilibration of hydrostatic pressure in blebbing cells. Non-stick water
• Abstracts: Invariant chain influences the immunological recognition of MHC class II molecules. Presentation of viral antigen controlled by a gene in the major histocompatibility complex
• Abstracts: Wildlife watching in southern Connecticut. Something to grouse about. Can we make "humane" one of the H-words?
• Abstracts: Hot-spotting in the Pacific. A model for the global variation in oceanic depth and heat flow with lithospheric age

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.