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dc.contributorHilali, Muhi El-Dineen_US
dc.contributorHassen, Halimaen_US
dc.contributorBraga Lobo, Raimundo Nonatoen_US
dc.contributorRischkowsky, Barbaraen_US
dc.creatorHaile, Aynalemen_US
dc.identifier.citationAynalem Haile, Muhi El-Dine Hilali, Halima Hassen, Raimundo Nonato Braga Lobo, Barbara Rischkowsky. (29/6/2018). Estimates of genetic parameters and genetic trends for growth, reproduction, milk production and milk composition traits of Awassi sheep. animal, 13 (2), pp. 240-247.en_US
dc.description.abstractGenetic parameters and genetic trends for growth, reproduction, milk production and composition traits were estimated for Syrian (S) and Turkish (T) Awassi sheep and their crosses maintained at the International Center for Agricultural Research in the Dry Areas Tal Hadya station, Aleppo, Syria (now in Terbol station in Lebanon). The data were spread over 9 years. The individual breed additive effects of T were positive and significant (P < 0.05) for birth weight (BW). However, the values for weaning weight (WW ) and pre-weaning weight gain (WG) were negative, even though they were significant ( P < 0.05 ). These estimates were positive and significant (P < 0.05) for all reproduction and milk traits, except for litter weight at birth (LWB). The additive contributions of T were 60.72 ± 0.94 days, 1.643 ± 0.359 kg, 13.09 ± 0.89 days, 16.13 ± 0.89 kg, 1.12 ± 0.44 kg, 0.71 ± 0.26 kg, 2.80 ± 0.72 kg a n d 0.83 ± 0.32 kg for lambing interval (LI), litter weight at weaning (LWW), lactation length, milk yield, fat yield , protein yield, total solids yield and lactose yield, respectively. The heterosis effects, both individual and maternal, were non-significant ( P > 0. 0 5 ) for most growth traits. Crossing of T with S, however, resulted in desirable and significant (P < 0.05) individual heterosis effects for all the reproduction, milk production and constituent yields. The heritability (h ²) estimates, both direct and maternal, were low for BW , WW, WG and all reproductive traits indicating major influence of environmental factors, whereas milk yield and composition had medium values. Birth weight had moderate genetic correlation with WW and WG. The genetic correlation between WW and WG was high (0 .724 ± 0.951 ). Lambing interval had large negative genetic correlation with LWB and LWW. However, LI had medium significant correlations with all the milk production and composition traits. Larger litter weights at birth had high and negative influence on milk yield of the dam and its constituents. Genetic changes over years for all traits were non-significant. The lack of genetic change in the studied traits calls for systematic and organized selection scheme.en_US
dc.publisherCambridge University Press (CUP): STM Journals - No Cambridge Openen_US
dc.sourceanimal;13,(2018) Pagination 240,247en_US
dc.subjectfat and protein yieldsen_US
dc.subjectlactation lengthen_US
dc.titleEstimates of genetic parameters and genetic trends for growth, reproduction, milk production and milk composition traits of Awassi sheepen_US
dc.typeJournal Articleen_US
cg.creator.idHaile, Aynalem: 0000-0001-5914-0487en_US
cg.creator.idHilali, Muhi El-Dine: 0000-0002-8945-9613en_US
cg.creator.idRischkowsky, Barbara: 0000-0002-0035-471Xen_US
cg.subject.agrovocenvironmental factorsen_US
cg.subject.agrovoclitter weighten_US
cg.contributor.centerInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.centerEmpresa Brasileira de Pesquisa Agropecuária - EMBRAPAen_US
cg.contributor.crpCGIAR Research Program on Livestock Agri-Food Systems - LAFSen_US
cg.contributor.funderInternational Livestock Research Institute - ILRIen_US
cg.contributor.projectCGIAR Research Program on Livestock Agri-Food Systemsen_US
cg.contributor.project-lead-instituteInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.coverage.regionEastern Africaen_US
dc.identifier.statusTimeless limited accessen_US

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