Inbreeding depression is a general phenomenon that is well documented in many plants and animals. Furthermore, it is generally considered to be the driving force behind mating-system evolution. Traditionally, the focus has been on the mean level of inbreeding depression in populations. However, more recently, the variation in inbreeding depression among individuals within populations has been s...

Quadratic partial regression coefficients were estimated for the inbreeding level on five performance traits (body weight, average egg weight, age at first egg, percentage of fertilized eggs, and hatchability of set eggs) of two strains of laying hens. Data on 5631 of H77 layers and 3563 of N88 layers from nine consecutive generations were analysed. Only dams were accounted for. Partial regress...

Inbreeding, which is common in plants, may increase the vulnerability of populations to natural enemies. Similarly, natural enemies may increase the expression of inbreeding depression in their hosts, resulting in altered selection on host mating-system evolution. To examine effects of inbreeding on tolerance to herbivory, we transplanted experimentally selfand cross-fertilized plants into four...

Purdue University Cooperative Extension Service West Lafayette, IN 47907 Author: David S. Buchanan, Oklahoma State University, Reviewers: Kreg Leymaster, USDA MARC, Clay Center NE; Ken Stalder, Univ. of Tennessee, Jackson, TN; William Luce, Oklahoma State Univ., Stillwater, OK Inbreeding is the mating of individuals that are related. In the strict sense, all members of a breed are related. As a...

A recent study on the Holstein/Friesian (HOL) breed has indicated that the rapid rise in percentage Holstein genes in the United Kingdom (UK) has been accompanied by an increasing rate of inbreeding (Kearney et al., 2004). They reported an average inbreeding rate of 0.17% per year since 1992. Some of the consequences of inbreeding, for instance, inbreeding depression, are expected to be more pr...

Inbreeding is essentially the mating of animals that are related. Within the pedigree of the mated sire and dam, one or more animals will be in common; resulting in progeny with a certain level of inbreeding. The level of inbreeding will depend on the relationship between the two mated animals, with the closer the relationship, the greater the level of inbreeding that will occur in the resultin...

Computer mating programs have helped breeders minimize pedigree inbreeding and avoid recessive defects by mating animals with parents that have fewer common ancestors. With genomic selection, breed associations, AI organizations, and on-farm software providers could use new programs to minimize genomic inbreeding by comparing genotypes of potential mates. Relationships could be computed between...

Inbreeding is basically the mating of animals that are related. Within the pedigree of the mated sire and dam, one or more animals will be in common; resulting in progeny with a certain level of inbreeding. The level of inbreeding will depend on the relationship between the two mated animals. The closer the relationship, the greater the level of inbreeding that will occur in the resulting progeny.

Data for the current study were obtained from a divergent selection experiment in which the selection criterion was the average serum IGF-I concentration of 3 postweaning blood samples collected from purebred Angus calves. Multiple trait derivative-free REML procedures were used to obtain estimates of inbreeding depression for IGF-I concentration and for BW and BW gains measured from birth to t...

effects of inbreeding coefficient on estimates of genetic parameters, breeding values and genetic trends for production traits (milk, fat and protein yields), reproduction traits (age at the first calving, interval between first insemination to conception, calving interval, interval between calving to first insemination, and calving ease) as well as longevity of holstein cattle in iran were stu...