Adjustment factors of birth weight and four postnatal weights for type of birth and rearing, sex of lambs and dam age

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dc.contributoren-US
dc.creator., Subandryo
dc.creatorVogt, D.W
dc.date2014-02-25
dc.date.accessioned2018-06-04T06:47:43Z
dc.date.available2018-06-04T06:47:43Z
dc.date.issued2014-02-25
dc.descriptionMany factors contribute to variation in lamb weights . Factors such as age of lamb, sex, type of birth and rearing, and ewe age at lambing obscure genetic differences among lambs . Variation associated with these factors make selection for increased weight less effective . To improve selection response, selection must be based on genotypic rather than environmentally induced superiority . It is well-documented that corrections for classifiable sources of variation render selection and culling more accurate, thereby increasing rates of genetic improvement . The objective of this study were to develop within breed adjustment factors for post-natal lamb weights . Field records from Suffolk and Dorset lambs collected in the U.S . National Sheep Improvement Program (NSIP) from 1986 through 1989 were used to develop within-breed birth/rearing type, lamb sex, and dam age adjustment factors for birth weight (BW) and 30-d (W3o), 60-d (Woo), 90-d (W9o), and 120-4 (Wtm) weights. Data were analyzed using general linear models . Within breed and age group adjustment for lamb-age differences were suggested because growth rates vary among breeds and among the four postnatal lamb-age groups . Within-breed multiplicative adjustment of the five traits for the effects of birth/rearing type, lamb sex and dam age were suggested because variances of these factors were significantly (P<0.01) heterogenousen-US
dc.formatapplication/pdf
dc.identifierhttp://medpub.litbang.pertanian.go.id/index.php/jitv/article/view/1
dc.identifier10.14334/jitv.v1i1.1
dc.identifier.urihttps://repository.pertanian.go.id/handle/123456789/3008
dc.languageeng
dc.publisherIndonesian Animal Sciences Societyen-US
dc.relationhttp://medpub.litbang.pertanian.go.id/index.php/jitv/article/view/1/1
dc.rightsCopyright (c) 1970 Indonesian Journal of Animal and Veterinary Sciencesen-US
dc.rightshttp://creativecommons.org/licenses/by/4.0en-US
dc.source2252-696X
dc.source0853-7380
dc.sourceIndonesian Journal of Animal and Veterinary Sciences; Vol 1, No 1 (1995); p.1-10en-US
dc.titleAdjustment factors of birth weight and four postnatal weights for type of birth and rearing, sex of lambs and dam ageen-US
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion
dc.typePeer-reviewed Articleen-US
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