EurekaMag
+ Most Popular
Cunninghamia lanceolata plantations in China
Mammalian lairs in paleo ecological studies and palynology
Studies on technological possibilities in utilization of anhydrous milk fat for production of recombined butter-like products
Should right-sided fibroelastomas be operated upon?
Large esophageal lipoma
Apoptosis in the mammalian thymus during normal histogenesis and under various in vitro and in vivo experimental conditions
Poissons characoides nouveaux ou non signales de l'Ilha do Bananal, Bresil
Desensitizing efficacy of Colgate Sensitive Maximum Strength and Fresh Mint Sensodyne dentifrices
Administration of fluid by subcutaneous infusion: revival of a forgotten method
Tundra mosquito control - an impossible dream?
Schizophrenia for primary care providers: how to contribute to the care of a vulnerable patient population
Geochemical pattern analysis; method of describing the Southeastern limestone regional aquifer system
Incidence of low birth weights in a hospital of Mexico City
Tabanidae
Graded management intensity of grassland systems for enhancing floristic diversity
Microbiology and biochemistry of cheese and fermented milk
The ember tetra: a new pygmy characid tetra from the Rio das Mortes, Brazil, Hyphessobrycon amandae sp. n. (Pisces, Characoidei)
Risk factors of contrast-induced nephropathy in patients after coronary artery intervention
Renovation of onsite domestic wastewater in a poorly drained soil
Observations of the propagation velocity and formation mechanism of burst fractures caused by gunshot
Systolic blood pressure in a population of infants in the first year of life: the Brompton study
Haematological studies in rats fed with metanil yellow
Studies on pasteurellosis. I. A new species of Pasteurella encountered in chronic fowl cholera
Dormancy breaking and germination of Acacia salicina Lindl. seeds
therapy of lupus nephritis. a two-year prospective study

Estimate of genetic parameters for first lactation test-day records and total milk yield for Caracu cows


Estimate of genetic parameters for first lactation test-day records and total milk yield for Caracu cows



Revista Brasileira de Zootecnia 32(2): 284-294



ISSN/ISBN: 1516-3598

Genetic parameters for first lactation test-day milk yields and 305 day milk yield (M305) for Caracu cows were estimated. The test-day animal model included additive genetic effect as random and contemporary group and age of cow (quadratic regression) as fixed effects. Two contemporary groups were defined to explain variation, composed by year, week of test and paddock (gc1) or year, week of test and paddock (gc2). Variance components were estimated by Restricted Maximum Likelihood. Phenotypic, residual and genetic additive variances were higher at the beginning of lactation, however the genetic additive variances were proportionally smaller than the other variances. Heritability estimates ranged from 0.09 to 0.32 and were higher at the end of lactation, indicating larger genetic variability in this period. The genetic correlation (ra) among test-days were positive and decreased with the increase in lag between tests. Heritability for M305 was 0.27 and the ra between test days and M305 were positive and high, mainly for mid lactation. The results indicate greater genetic response in M305 through direct selection rather than by correlated response based on test-day milk yield selection.

Please choose payment method:






(PDF emailed within 1 workday: $29.90)

Accession: 034870767

Download citation: RISBibTeXText

Related references

Estimate of genetic parameters for first lactation test-day records and total milk yield for Caracu cows. Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science 32(2): 284-294, 2003

Genetic parameters for test-day milk yield, 305-day milk yield, and lactation length in Guzerat cows. Livestock Science 152(2): 114-119, 2013

Prediction of total milk yield of Caracu cows from complete and incomplete records, using three mathematical functions. Ars Veterinaria 17(1): 79-82, 2001

Monthly test day milk records and yield at 244 days ii. genetic parameters in first lactation. Cuban Journal of Agricultural Science 24(2): 139-144, 1990

Estimation of genetic parameters for test day milk records of first lactation Gir cows in Brazil using random regression. Proceedings of the 7th World Congress on Genetics Applied to Livestock Production, Montpellier, France, August, 2002 Session 17: 1-4, 2002

Genetic Parameters for Milk Yield and Milk Component Traits Estimated from Test Day and 305D Lactation Records of Philippine Dairy Buffaloes. Buffalo Bulletin 32: 768-772, 2013

Studies on monthly and cumulative monthly milk yield records. v. estimating total lactation from part lactation records from culled cows and from cows with different production levels. Acta Agriculture Scandinavica 7(3): 190-196, 1977

Genetic parameters of milk yield and milk fat percentage test day records of Iranian Holstein cows. Asian Australasian Journal of Animal Sciences 18(9): 1231-1236, 2005

Genetic parameters of milk yield and milk fat percentage test day records of Iranian Holstein cows. Asian-Australasian Journal of Animal Sciences 18(9): 1231-1236, 2005

Genetic parameters of milk yield and milk fat percentage test day records of Iranian Holstein cows. Asian-Australasian Journal of Animal Sciences 18(9): 1231-1236, 2005

A quantitative genetic study on part and total milk yield in Caracu cows. Arquivo Brasileiro de Medicina Veterinaria e Zootecnia 40(1): 86-87, 1988

Estimation of genetic parameters for test day milk records of first lactation Gyr cows using repeatability and random regression animal models. Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science 34(5): 1519-1530, 2005

Estimation of genetic parameters for test day milk records of first lactation Gyr cows using repeatability and random regression animal models. Revista Brasileira de Zootecnia 34(5): 1519-1530, 2005

Random regression models to estimate test-day milk yield genetic parameters Holstein cows in Southeastern Brazil. Livestock Science 123(1): 0-7, 2009

Estimation of genetic parameters for test day milk yield of first lactation Jersey cows using repeatability and random regression models. Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science 35(4): 1646-1652, 2006