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- W1538492761 abstract "The aims of this study were to evaluate the growth performance ofHereford, Angus, Hereford × Angus and Hereford × Saler heifers withinthe same herd grazing native pastures and to estimate homozygosityand inbreeding coefcients using random amplied polymorphic DNA(RAPD) markers. Post-weaning liveweight (BW), average daily gain(ADG) and body condition score (BCS) on a scale from 0 to 5 weremonitored monthly from 2005 to 2006. Genomic DNA was extractedfrom blood samples, amplified using RAPD primers, fragmentsresolved by gel electrophoresis and banding patterns elucidated underUV light. Estimation of homozygosity through band sharing patternswas utilised in determining within-breed inbreeding levels. Regardlessof breed, LWT, BCS and ADG of heifers followed a typical sigmoidcurve pattern characterised by a decline in average BW from 200 kgin May to 188 kg in June, a continuous monthly increase through toMarch 2006 when it reached a peak (380 kg) before a nal decline to375 kg in May. The BCS ranged from 1.6 to 3.6 while ADG rangedfrom -0.4 to 1.5 kg/d. Significant genetic variation was observedbetween the different breeds in that BCS and BW of purebred Angusheifers were lower than those of purebred Hereford and their crosseswith Angus and Saler. Average BW of the Angus breed ranged from164-349 kg, with BCS ranging from 1.4 to 3.3 compared to theHereford (186-383 kg, 1.6-3.6), Hereford × Angus (192-383 kg,1.7-3.6) and Hereford × Saler (192-385 kg, 1.6-3.7), respectively. TheADG of the Angus was not different from those of Hereford and theircrosses indicating that the Angus was perhaps better in terms of feedefciency since they probably ate less and gained the same weight asthe heavier breeds that must have eaten more commensurate with theirmaintenance requirements. The strongest residual correlation (r=0.98)was between BW and BCS. Average band sharing frequencies rangedfrom 0.60 in the crossbreds to 0.96 in the purebreds with estimatedinbreeding coefcients ranging from 0.5% to 3%, respectively, whichis very low." @default.
- W1538492761 created "2016-06-24" @default.
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- W1538492761 date "2007-07-08" @default.
- W1538492761 modified "2023-09-23" @default.
- W1538492761 title "Post-weaning growth performance of heifers grazing Tasmanian native pastures and the estimation of inbreeding levels using random amplified polymorphic DNA markers" @default.
- W1538492761 hasPublicationYear "2007" @default.
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