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Twenty-four 21-day-old Balouchi male lambs were equally divided into two groups.Twelve subjects were artificially reared (AR), twelve others were ewe reared (ER) and usedas control. AR in comparison of ER lambs maintained higher concentrations of blood beta-Hydroxybutyric acid (BHBA); however glucose concentration was not affected by rearingsystem. Unlike the DNA content and cell size, the RNA concentration and ribosomal capacity(Cs) of AR groups were significantly (P<0.05) higher than that of ER lambs. Rearing system didnot affect morphologic characteristics of rumen wall except thickness of keratinized layerthat was thickest in AR, 20 % less than in ER lambs (P<0.05). Stomach weight and capacity inAR animals were significantly (P=0.05) higher than ER lambs. Neither post-weaning growthrate nor feed conversion efficiency were affected (P>0.05) by rearing method. Also therewere no differences with respect to slaughter and dissection data between groups in postweaningphase. In conclusion, the results of this study showed that naturally rearing systemgave rise to developmental and carcass characteristics similar to those observed in artificialraised lambs

Effect of rearing system on pre-weaning growth, rumen development and its influence on post-weaning performance of lambs