妊娠后期胎儿宫内发育受限对蒙古绵羊胎儿内脏器官生长发育的影响

his study investigated the effect of intrauterine growth restriction during late pregnancy on the growth and development of ovine fetal visceral organs.100 mongolia ewes allocated to three groups，which were oestrus at scheduled time and become pregnant, were given 0.175 MJME/kgw-0.75d -1 (Restricted Group 1 ;R1), 0.33 MJME/kgw-0.75d-1(Restricted Group 2;R2), and voluntary intake（control group ;CG） respectively during late pregnancy (90-150 d). The results indicated that the maternal undernutrition had influenced average lamb birth weight and daily growth rate of fetus in RG1（p<0.01）and RG2（p<0.05）,and restricted CRL（p<0.01）and thoracic girth（p<0.01）in RG1.The weights of the lung （p<0.01）, spleen （p<0.01）, heart（p<0.05）, liver（p<0.05） and abomasums （p<0.01） in RG1 were significantly lighter than that of the CG. In RG2, only the weight of lung（p<0.05） and spleen（p<0.01） were significantly lighter than that of the CG; When expressed as a percentage of body weight, significance was retained in the spleen（p<0.01）of both restricted groups, but the rate of brain in RG1 was significantly higher than that of the CG（p<0.01）. For lung and spleen, maternal undernutrition resulted in the amount of DNA were significant lower（p<0.01）in both restricted neonatal lambs compared with CG, however, there was a significant difference only between RG1 and CG for protein:DNA ratio in lung（p<0.01）. The DNA content in kidney，abomasums and jejunum were decreased（p<0.05）of RG1 neonatal lambs ，but in liver and reticulum, the protein:DNA ratio was decreased（p<0.05）compared with CG.