Lambs are born heavier have a greater chance of survival. However, there is an association between higher birth weight and increased sheep calving difficulty, causing dystocia and in some cases is the death of the lamb. The aim of the present study was to analyze live weight and growth data of live weight at birth to 24.5–25.5 kg in weaned Dorper crossbred lambs. The evaluated a total of 93 Dorper crossbred lambs born (½ Dorper + ½ Santa Inês), with percentage of 17.7 double (twin couple = 21%, twin with only females = 50%, twin with only males 29%). The data were submitted to the normality test (Shapiro-Wilk, Kolmogorov-Smirnov and Cramer-von Mises). After verifying if the data follow a normal distribution N (μ, σ ), the results were submitted to Pearson and Spearman correlation analysis. The sex of the lamb influenced (P <0.05) the live weight at birth total (LWBtotal) and live weight at birth average (LWBaverage), the male lambs had in both characteristics superior values. No differences (P >0.05) were found for the age at weaning (AW), live weight at birth total (LWWtotal) and live weight at weaning average (LWWaverage). For the type of birth all characteristics were significant (P <0.05). For doubling birth the characteristics LWBtotal, AW and LWWtotal had higher values. Lambs that had higher live weight at birth average had lower age at weaning and consequently higher live weight at birth average and average daily gain. The sex of the lamb influenced the live weight at birth total and live weight at birth average, the male lambs had in both characteristics superior values. For type of birth, twins are born smaller than singletons. Acknowledgements for support: FAPEG, IFGoiano and CNPq.
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