EurekaMag.com logo
+ Site Statistics
References:
53,869,633
Abstracts:
29,686,251
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Genetic evaluation of dairy sheep with an animal model for annual or partial lactation production



Genetic evaluation of dairy sheep with an animal model for annual or partial lactation production



Journal of Dairy Science 77(2): 609-615



Two traits were compared as breeding objectives for the selection of dairy sheep: the total milk produced during 1 yr and the production over the first 70 d in milk. Both traits are proposed for sheep breeds that have more than one lambing per year and, consequently, highly variable lactation length. Breeding values for both traits were obtained with an animal model including flock-year-season of lambing and age class as fixed effects and additive genetic and permanent environmental as random effects. A total of 12,759 ewes and 547 rams of the Massese breed of sheep were evaluated for both traits, which were built up from a total of 31,170 lactations of 11,106 ewes. Average annual production was 161.8 kg; average length of lactation was 146.9 d/yr, and average partial lactation production from d 31 to 100 after lambing was 90.9 kg. Estimated breeding values ranged from -54.8 to 74.5 kg of milk for annual production and from -26.2 to 33.1 kg of milk for partial lactation production. Correlation of the estimated breeding values for the two traits was 67.4%. Annual genetic trend from 1980 to 1988 was .48 kg of milk for annual production and .07 kg of milk for 70 d lactation production.

Accession: 002390883

Download citation: RISBibTeXText

PMID: 8182186

DOI: 10.3168/jds.S0022-0302(94)76990-3

Download PDF Full Text: Genetic evaluation of dairy sheep with an animal model for annual or partial lactation production



Related references

Use of an animal model for genetic evaluation of the lacaune dairy sheep. Livestock Production Science 31(3-4): 287-299, 1992

Evaluation of the effect of non genetic factors on the quantitative characters in dairy sheep ii. milk production per lactation period. Genetika i Selektsiya 23(6): 571-576, 1990

Genetic evaluation of the Lacaune, Manech and Sarda dairy sheep with an animal model. Proceedings of the 5th international symposium on machine milking of small ruminants, Budapest, Hungary, May 14-20, 1993: 289-304, 1993

Use of the animal model for genetic evaluation of dairy sheep and goats in several ICAR member countries. Lajoie, L [Author], Lafontaine, S [Author], Doyle, P [Author] EAAP Publication; Milk and beef recording: State of the art, 1994 271-275, 1995

Genetic variation of lactation curves in dairy sheep: quadratic function vs. Wood's model. Livestock Production Science 77(2/3): 147-153, 2002

Genetic variation of lactation curves in dairy sheep: Quadratic function versus Wood's model. Livestock Production Science 77(2-3): 147-153, 1 November, 2002

Prediction of the lactation yield in dairy sheep using a test-day animal model, electronic identification of animals and automated data collection. Options Mediterraneennes Serie A, Seminaires Mediterraneens ( 33): 97-103, 1997

Using a biological model of lactation to reassess dairy recording and genetic evaluation. Proceedings of the 7th World Congress on Genetics Applied to Livestock Production, Montpellier, France, August, 2002 Session 1: 1-4, 2002

Use of multiple-trait animal models for genetic evaluation of milk, fat and protein lactation yields of dairy cattle in Belgium. BASE: Biotechnologie, Agronomie, Societe et Environnement 1(1): 26-33, 1997

Test day model as an alternative to a lactational model for genetic evaluation of dairy sheep. InVet Investigacion Veterinaria 2(1): 27-32, 2000

The multiple (part) lactation model for the evaluation of dairy cattle: 1st communication: Estimation of genetic parameters. Zuechtungskunde 66(2): 85-94, 1994

Animal model evaluation of dairy traits in US sheep breeds, their crosses and three synthetic populations. Small ruminant research: the journal of the International Goat Association 34(1): 1-9, 1999

Genetic evaluation by animal model techniques of first lactation length and mean daily milk yield of Caracu cattle. Archivos Latinoamericanos de Produccion Animal 6(1): 71-78, 1998

Animal model for genetic evaluation of dairy cattle in Japan. Animal Science & Technology 64(10): 953-963, 1993

Genetic parameters of a biological lactation model: early lactation and secretion rate traits of dairy heifers. Animal 3(8): 1085-1093, 2009