The objective of this study was conducted to study the effects of dietary different supplemental levels of yeast culture ( YC) on growth performance，slaughter performance，visceral organ development and meat quality of fattening Hu sheep．

One hundred and twenty 3 to 4-month-old male fattening sheep with average body weight of 38 kg were randomly assigned to 4 groups with 5 replicates in each group 6 sheep in each replicate．

The experiment was divided into two stages: early stage of fattening ( 1 to 60 d) and later stage of fattening( 61 to 90 d) ，and the ratio of concentrate to roughage of basic diet were 60∶40 and 75∶25 during early stage of fattening and later stage of fattening，respectively． Sheep in the control group were fed a basal diet during whole stage of fattening ( 1 to 90 d) ; during early stage of fattening，sheep in experimental groups were fed the basal diet supplemented with 5 ( group A) ，10 ( group B) and 20 g /d ( group C) YC，respectively; during later stage of fattening，sheep in experimental groups w ere fed the basal diet supplemented w ith 10( group A) ，20 ( group B) and 40 g /d ( group C) YC，respectively． The pre-experimental period lasted for 7 days，and the experimental period lasted for 90 days． The results show ed as follow s: 1) during early stage of fattening，there w as no significant difference in average daily gain among all groups; during later stage of fattening and whole stage of fattening，the average daily gain of group A was significantly higher than that of the control group，and the ratio of feed to gain was significantly lower than that of the control group． 2) There were no significant differences in live weight before slaughter，carcass weight，dressing percentage，eye area and GＲ value among all groups． 3) The kidney weight of group A was significantly higher than that of the control group，and there were no significant differences in heart，liver，lung and spleen weights and their percentages of live weight before slaughter among all groups． 4) There were no significant differences in rumen，reticulum，omasum and abomasum weights and their percentages of live weight before slaughter among all groups．5) There were no significant differences in pH，drip loss rate and meat color among all groups．

    It is concluded that under this experimental condition，the supplementation of YC can not improve the slaughter performance and meat quality of fattening Hu sheep，diet supplemented with 10 g /d YC can increase the growth performance of Hu sheep during later stage of fattening．

［Chinese Journal of Animal Nutrition，2020，32(5)］