Determination of some macro-environmental factors affecting liveweight of Romanov X Awassi crossbred lambs at different periods

Environment is an important source of variation in the quantitative characters of living organisms. In the selection process of breeding programmes, these factors should be determined and the variation caused by these factors should be eliminated. In addition, in terms of herd management, identifying macro-environmental factors and arranging the care and management works in the herd increases production efficiency. In this study, some macro-environmental factors affecting the live weights of various periods in ((ROMANOV X AWASSİ)) X (AWASSİ)) (İG1) and ((İG1) X (ROMANOV X AWASSİ)) (RİM) lambs and their effect amounts will be calculated. Least square means and standard errors of live weight values according to birth type, birth in single lambs in the 1st, 2nd, 3rd, 4th, 5th, 6th, and 7th months, respectively: 5.140.150, 11.210.335, 17.270.623, 24.640.718, 30.490.928, 35.410.997, 40.571.166 and 43.651.303 was determined as. In twin lambs, birth was determined as 3.740.247, 9.210.521, 14.850.968, 21.521.116, 26.971.524, 31.871.636, 36.071.839 and 38.952.053 in the 1st, 2nd, 3rd, 4th, 5th, 6th and 7th months, respectively. While birth, 1st, 2nd, 3rd, 4th and 6th months live weights showed a statistically significant difference according to birth type (p<0.05, p<0.01), no statistical difference was observed in 5th and 7th months live weights (p>0.05). Least square means and standard errors of live weight values according to genotype, birth, 1st, 2nd, 3rd, 4th, 5th, 6th and 7th month weights of lambs in the IG1 genotype group were determined as 4.390.207, 10.790.463, 17.180.861, 24.890.992, 31.171.277, 36.671.371, 41.621.524 and 44.351.702 respectively. It was found as 4.490.185, 9.720.390, 14.940.726, 21.260.837, 26.281.143, 30.691.227, 35.021.435 and 38.251.602 in lambs in the RİM genotype group. There was no statistical difference between birth and 1st month live weights according to genotype (p>0.05). The live weights of male lambs at birth, 1st, 2nd, 3rd, 4th, 5th, 6th and 7th months were determined as 4.210.222, 10.180.492, 16.140.915, 23.231.054, 30.111.373, 35.881.474, 41.651.778 and 47.271.986 respectively. Live weights of female lambs were found as 4.670.171, 10.330.363, 15.980.676, 22.930.779, 27.351.056, 31.491.134, 34.911.224 and 35.331.366 according to months. While a significant statistical difference was observed between the 5th month, 6th month and 7th month live weights according to sex status (p<0.05, p<0.01), it was determined that there was no difference in birth, 1st month, 2nd month, 3rd month and 4th month live weights (p>0.05).