SOME RESULTS OF CROSSING ROMANOV AND KATAHDIN SHEEP BREEDS
2021
Dmitrieva T.O. (Katumi LLC (OOO SKhP "Katumi"))
The study is aimed at examining the results of the accumulation cross breeding of Romanov and Katahdin sheep breeds. Thestudy tests Katahdin rams imported from America. For grading up, the study uses the Romanov ewes, acclimatized for the NorthWestern region of Russia. The analysis of the relationship between the reproduction indicators of the Katahdin ewes of differentbloodlines shows a positive correlation of the pedigree with the percentage of the yeaned ewe and the safety of the lambs forweaning (0.646; p<0.01), as well as a positive two-way correlation between the number of lambs received per one yeaned eweand the safety of the lambs for weaning (0.719; p<0.01). At the same time, the highest level of safety of lambs for weaning wasin the group ♂КТ x ♀3/4КТ×1/4РО and amounted to 98.5%. The study revealed a two-way positive correlation between theindicator of live weight at birth and during weaning from 50% to 87.5% of the pedigree of the Katahdin breed (from 0.789 to0,920; р<0,01), which points to the effectiveness of using this type of cross breeding for the purposes of improving the meatproduction of the Romanov sheep before 3rd generation.
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