Estimates of efficiency of Dorper and Rambouillet lambs.

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Title: Estimates of efficiency of Dorper and Rambouillet lambs.
Author: Yeaman, Jessup
Abstract: Feed intake and body weight were recorded on thirty -seven Dorper ram lambs and forty -two Rambouillet ram lambs from weaning to 61kg of body weight to determine feed conversion efficiency . The data were collected over a two year period . Lambs were progeny of 6 unrelated sires per breed . Lambs were approximately 90 days of age and 31kg body weight at the start of the trial . Lambs were fed a commercially prepared , pelleted diet with an average crude protein content of 16 % and TDN of 70 .5 % . Lambs were divided into groups of 10 -11 containing both breeds , and fed using FIRE (Feed Intake Recording Equipment , Osborne Industries , Inc , Osborne , KS , USA ) . Lambs were identified using a unique electronic identification ear tag transponder . Feed intake was recorded electronically and lambs were weighed every two weeks . Data were analyzed using SAS PROC MIXED with a model that included breed and birth type as fixed effects , a random effect for sire , and starting weight as a covariate . In both years of the trial , breed was not found to have a statistically significant effect on ADG or FCE (p >0 .05 ) . Post weaning feed efficiency was similar between Dorper and Rambouillet lambs . The Dorpers’ total ADG was 340 g /d ; the Rambouillets’ was 342 g /d . The Dorpers’ average FCE was 0 .159 ; the Rambouillets’ was 0 .158 . Over the post weaning period studied there was no advantage shown by either breed .
URI: http : / /hdl .handle .net /2346 .1 /13
Date: 2011-05-03


Yeaman, Jessup Estimates of efficiency of Dorper and Rambouillet lambs.. Master's thesis, Angelo State University. Available electronically from http : / /hdl .handle .net /2346 .1 /13 .

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