The multivertebrae rates in Mongolia sheep were higher than that of other breeds.The 
vertebral formulae of thoracic and lumbar vertebrae in Mongolia sheep were 
T13L6( 10.57%),T13L7(63.19%),T 14L6( 19.67%) and T14L7(6.57%).The T14 and the L7 
were the results of mutations of Homeobox genes located in the 9th and the 11th paralogue 
groups which determined the morphology- of individual vertebra of the thoracic and lumbar 
column. Among Fi of reciprocal cross of T14 and T13, T13 held 67.57% and 78.57%,T14 held 
32.43% and 21.43%.Among F, of T14, T14 and T13 held 80.19% and 19.91%.Among F, of 
T13, T13 and T14 held 88.24% and 11.76%.These tests proved: l.the phenotypes of T14 
and/or L7 were recessive characters and showed incomplete penetrance; 2.the T13 and/or L6 
were wild-types and were made up of homozygotes and heterozygotes.The frequencies of 
Ti4',Ti3+,L7' and U + were 0.5123,0.4877,0.8352 and 0.1648.The frequencies of Tb^ T ^ T h 
\Lr,L<r,L7- were 0.2379,0.4997,0.2624,0.0271,0.2753,0.6979.The length of thoracic and 
lumbar vertebrae,the live weight,the carcass weight,the meat weight ,the area of eye muscle 
and the meat percentage had the same order. T14L7>T14L6>T13L7>T13L6.

L. Zhang, B. Siqin

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 24: Sheep and goats (fibre); sheep and goats (meat and milk); poultry; horses; buffaloes., , 246–249, 1998
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