Study On Change Regulation Of Growth And Development And Meat Quality Of Tan Sheep Under Stall Feeding

In this paper.feeding trial and slaughter experiment were used to study the growth and development and meat quality at newborn lamb,40days,weaning period,six months of age,nine months of age,twelve months of age and adult tan sheep for stall feeding.The results as follows:The growth speed of body weight was faster at suckling lamb and slower after weaning.The daily gain was highest up to163g from bron to40days old.Rams growth speed were similar to ewes at suckling lamb.but it was higher than ewes after weaning.Slaughter rates increased with increasing age except the nine months and twelve months of age.The carcass meat percentage were no significant except the adult sheep was minimum,but increased with increasing age from newborn to twelve months of age.Bone percentage had the similar trend with the ratio of bone to meat,which decreased with increasing age.The GR value increased with increasing age except the six months and twelve months of age.The eye muscle area were no significant difference among nine months of age.twelve months of age and adult sheep.but the minimum was at newborn lamb,followed by40days and six months of age,the maximum was at weaning period.Meat color and marbling had overall increasing trend with increasing age.The drip loss was maximum at40days old and minimum at twelve months of age and adult sheep.There were no significant difference between all ages at cooked meat rate except the weaning period and twelve months of age were low.The rates of water loss were no significant difference among different ages except newborn lamb.The shear force increased-with-increasing age.Serum glucose showed a rising trend except40days period was too high and nine months of age was too low. Serum cholesterol and serum triglycerides were lower at six months and nine months of age,but serum cholesterol was the highest at40days period and serum triglycerides was the highest at adult sheep,and there were no significant difference among the other peoiods.Serum total protein was maximum at40days old,and then increased with increasing age after weaned.The muscle fat was significant positive correlation to serum glucose and negatively correlated to serum triglyceride. Serum glucose was highly significant positive correlated to serum total protein,and serum triglycerides was significant positive correlation to carcass fat.The muscle protein were significant difference among different ages.The muscle fat was highest at six months of age,minimum at newborn lamb.low at weaning period and twelve months of age,and there were no significant difference among others.The carcass fat increased with increasing age.Among the different ages,the muscle fat was higher but carcass fat was lower at six months of age.