Show simple item record

dc.contributor.author Roden, J. A.
dc.contributor.author Merrell, B. G.
dc.contributor.author Murray, W. A.
dc.contributor.author Haresign, William
dc.date.accessioned 2009-11-10T12:19:24Z
dc.date.available 2009-11-10T12:19:24Z
dc.date.issued 2003-06
dc.identifier.citation Roden , J A , Merrell , B G , Murray , W A & Haresign , W 2003 , ' Genetic analysis of live weight and ultrasonic fat and muscle traits in a hill sheep flock undergoing breed improvement utilizing an embryo transfer programme. ' Animal Science , vol 76 , no. 3 , pp. 367-373 . en
dc.identifier.issn 1357-7298
dc.identifier.other PURE: 138879
dc.identifier.other dspace: 2160/3478
dc.identifier.uri http://hdl.handle.net/2160/3478
dc.identifier.uri http://www.bsas.org.uk/Publications/Animal_Science/2003/Volume_76_Part_3/367/ en
dc.description Roden, J.A., Merrell, B.G., Murray, W.A., Haresign, W. (2003). Genetic analysis of live weight and ultrasonic fat and muscle traits in a hill sheep flockundergoing breed improvement utilizing an embryo transfer programme.   Animal Science, 76, (3), 367-373. en
dc.description.abstract Genetic parameters for pre-weaning live weights and ultrasonic scanning measurements were estimated from a flock of Scottish Blackface sheep undergoing an embryo transfer programme. Maternal environmental effects could be evaluated without confounding with maternal genetic effects because embryos were transferred to unrelated recipient ewes. The data for the study were collected over a 7-year period (1993-1999) and related to a conventional hill farming system. The data were from 1465 lambs, the progeny of 60 sires, 263 donors and 784 recipient ewes. The only exception to the conventional farming system was at mating time when embryos were collected from selected donor ewes, following superovulation, and transferred to unrelated recipient ewes. Maternal environmental effects were important for birth weight (BW), 4-week weight (W4) and weaning weight (WW) but of less importance for ultrasonic fat depth (UFD), muscle depth (UMD) and muscle width (UMW). The heritabilities of the pre-weaning weights were moderate (0.17 to 0.23). The heritabilities of UFD and UMD were 0.44 and 0.27 respectively and were higher than found in previous similar studies. The heritability of UMW was low, 0.06. The genetic and phenotypic correlations among the pre-weaning weight traits were positive and moderate. There was a positive genetic ( + 0.25) and phenotypic ( + 0.24) correlation between UFD and UMD. The phenotypic and genetic correlations between BW and W4 and the scanning traits (UFD, UMD and UMW) were close to zero, and the correlations of WW with UFD, UMD and UMW were positive. The results of this study clearly demonstrate the importance of maternal environmental effects for lamb weights up to weaning and also suggest that genetic improvement for carcass composition in some populations of extensively reared hill sheep could be achieved more rapidly than previously thought possible. en
dc.format.extent 7 en
dc.language.iso eng
dc.relation.ispartof Animal Science en
dc.title Genetic analysis of live weight and ultrasonic fat and muscle traits in a hill sheep flock undergoing breed improvement utilizing an embryo transfer programme. en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.contributor.institution Institute of Biological, Environmental and Rural Sciences en
dc.description.status Peer reviewed en


Files in this item

Files Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record

Search Cadair


Advanced Search

Browse

Statistics