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The early weaning and starter feeding have significant effects on lamb growth and digestive tract development. However, it is not clear whether the expression of  IGF-1/IGF-1R  genes could be affected by feeding starter and weaning. Therefore, a total of 102 Hu male neonatal lambs were randomly divided into 3 groups: fed with starter at 42d + weaned at 56d (group A), fed with starter at 7d + weaned at 28d (group B) and fed with starter at 7d + weaned at 56d (group C), to explore the effects of starter feeding and weaning age on developmental expressions of  IGF-I  gene in liver and  IGF-IR  gene in rumen of Hu sheep. The results showed that  IGF-I  and  IGF-IR  genes were expressed extensively in various tissues of lambs, the expression of  IGF-I  was significantly higher in liver ( p  &lt; 0.01), while the expression of  IGF-IR  was higher in rumen among gastrointestinal tissues. The mRNA level of  IGF-I  of group C was strikingly higher than that of group A at 28, 70, and 84d ( p  &lt; 0.01) in liver, respectively. Rumen mRNA level of  IGF-IR  of group C was prominently higher than that of group A at 70d and 84d ( p  &lt; 0.05), respectively. However,  IGF-IR  expression of group A was higher than that of group C at 14 and 42d ( p  &lt; 0.05). The mRNA level of  IGF-I  of group B was significantly higher than that of group C at 42, 56, 70, and 84d ( p  &lt; 0.01) in liver, while  IGF-IR  expression of group B was higher than that of group C at 70d ( p  &lt; 0.01). In conclusion, early weaning and starter feeding affected liver  IGF-I  mRNA and rumen  IGF-IR  mRNA expression.

animal biotechnology

Effects of starter feeding and early weaning on developmental expressions of  IGF-I  gene in liver and  IGF-IR  gene in rumen of lambs from birth to eighty-four days of age