Attainment of significantly higher lambing rates (p<0.05) and fecundity (p<0.01) in ewes given 500 IU PMSG subcutaneously, compared to ewes given PMSG intramuscularly, demonstrates the advantage of this administration route. The reason for this difference is vague, and the work of Greyling and van Niekerk (1989) suggested the pre-ovulatory LH surge to be significantly shorter in subcutaneously-injected does, compared to intramuscularlytreated animals. This may be due to the difference in the rate of absorption and metabolism of PMSG between subcutaneous and intramuscular administration (Zeleke et al., 2005).
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