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Estrus synchronization methods was use to control the reproductive traits of  sheep, as well as bringing more females at the same stage of estrus and  ovulation. According to the points mentioned above, the aim of the present  study was to investigate and compare mating method and influence of fixed  factors on birth and weaning weight of lambs. Statistical analysis showed  that exist difference in the body weights between genotypes of lambs. In the  first group, the difference in weight of lambs at birth, regardless of mating  method was not significant (P> 0.05), while in the second group, the  difference was slightly significant (P <0.05). As for the birth type, sex and  within the same genotype, there was a statistical significance (P <0.05)  between singles obtained naturally, between the triplets obtained naturally  and between triplets received hormonal method. All the differences between  body weight at 30 days (mating method, sex and birth type under the same  genotype) were statistically significant (P <0.05).The determined differences  in the body weights at 60 days (sex, mating method and type of birth under  the same genotype) were statistically significant (P <0.05). The results  showed that the differences (mating method, sex and type of birth under the  same genotype) were statistically significant (P <0.05), except in between  body weight at 90 days in twins among two genotypes obtained by natural  method, which were not statistically significant (P> 0.05). [Projekat  Ministarstva nauke Republike Srbije, br. TR31001 i br. TR31053]

Effect of mating method, sex and birth type on growth of lambs