+ Site Statistics
References:
54,258,434
Abstracts:
29,560,870
PMIDs:
28,072,757
+ Search Articles
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ PDF Full Text
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Translate
+ Recently Requested

Estimates of genetic gain based on selection differentials and population parameters in a herd of Caracu cattle



Estimates of genetic gain based on selection differentials and population parameters in a herd of Caracu cattle



Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science 34(6): 2245-2252



Data from the Caracu herd of Sertaozinho Experimental Station, selected for post weaning weight between 1979 and 2002, was analyzed to describe effective size, generation coefficient, generation interval, selection differentials and genetic gain in this Population. Genetic gain was estimated by the product of the average weighted standardized differential (kg) and heritability divided by the average generation interval. Averages of sire and dam weighted selection differentials for post weaning weights were 1.10 and 0.28 standard deviations units (s.d.u). Sire and dam cumulative selection differentials measured in the progenies born in 2001 were 3.61 and 2.32 s.d.u,, respectively. The ratio between averages of unweighted and maximum sire selection differentials was 0.89 indicating a efficiency loss of 11% mainly due to avoiding selection of related animals in the same year. Estimates of generation interval for the periods 1979 - 1984, 1985 - 1990, 1991 - 1996 and 1997 - 2002, were 6.3, 6.3, 5.5 and 4.8 years, respectively. In the same order, Population effective size was 9, 12, 20 and 64 for these periods. The generation coefficient For the progeny born in 2002 was 4.5 generations. Average annual inbreeding of the population was 0.50% and 1.83% for inbred animals. The annual estimated genetic gain by selection for yearling weight was 2.02 kg/year. The introduction of genetic material From other herds, the restriction to avoid mating of related animals and the selection of a maximum of two progeny/sire/year were effective to avoid larger increase of inbreeding.

(PDF emailed within 1 workday: $29.90)

Accession: 066193829

Download citation: RISBibTeXText


Related references

Estimates of genetic gain based on selection differentials and population parameters in a herd of Caracu cattle. Revista Brasileira de Zootecnia 34(6, Suplemento): 2245-2252, 2005

Estimates of genetic and phenotypic parameters for body weight and gain from birth to 365 days of age in a herd of Guzera cattle. Boletim de Industria Animal 50(2): 119-123, 1993

Estimates of genetic parameters and of direct and correlated responses to selection for growth and reproductive traits in a Canchim cattle herd. Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science 36(4): 1029-1036, 2007

Estimates of genetic parameters and of direct and correlated responses to selection for growth and reproductive traits in a Canchim cattle herd. Revista Brasileira de Zootecnia 36( 4, Supplement): 1029-1036, 2007

Estimates of genetic parameters for growth traits of Caracu cattle selected for yearling weight. Revista Brasileira de Zootecnia 35(4, Suppl. S): 1669-1676, 2006

Estimates of genetic parameters for growth traits of Caracu cattle selected for yearling weight. Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science 35(4): 1669-1676, 2006

Estimates of genetic parameters and genetic gain for reproductive traits in the herd of Polish Landrace sows for the period of 25 years of the breeding work. Archiv fur Tierzucht 50(Special Issue): 116-124, 2007

Genetic parameters of average daily gain in one Hereford cattle herd. Proceedings of the 8th World Congress on Genetics Applied to Livestock Production, Belo Horizonte, Minas Gerais, Brazil, 13-18 August, 2006: 03-45, 2006

Estimates of genetic parameters for serum macrominerals and preweaning weight gain in an angus brahman multibreed herd under subtropical conditions. Journal of Animal Science 69(SUPPL 1): 206, 1991

Estimates of genetic parameters for growth traits and calving day in a herd of Angus cattle. Canadian Journal of Animal Science 81(4): 624, 2001

Estimation of genetic gain in milk yield by selection in a closed herd of dairy cattle. Journal of Genetics 50(1): 1-8, 2014

Genetic and phenotypic aspects of milk yield in a herd of Caracu cattle. Revista da Sociedade Brasileira de Zootecnia 23(1): 140-148, 1994

Effects of cow costs per herd and genetic covariation structures on selection for further genetic gain in herd life. Journal of Dairy Science 78(SUPPL 1): 158, 1995

Effects of genetic groups to account for selection on estimates of genetic parameters for a line of Hereford cattle. Journal of Dairy Science 86(Supplement 1): 86, 2003

Genetic relationship between reproductive traits and milk yield in Caracu cattle: I. Genetic parameters. Arquivo Brasileiro de Medicina Veterinaria e Zootecnia 46(2): 149-160, 1994