The effect of oestrus synchronisation, PMS administration and flushing on oestrus and conception rate in South African Mutton Merino ewes

Botha, H.K.; Niekerk, C.H. van; Pagel, R.F.E.

South African Journal of Animal Science 5(3): 231-233


ISSN/ISBN: 0375-1589
Accession: 000535157

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In a 2 X 3 factorial experiment involving 186 South African Mutton Merino [German Mutton Merino] ewes which were synchronised during the breeding season by means of intravaginal pessaries containing 40 mg MAP, the effects of flushing v no supplementation (control) and of level of PMS injected (0, 300 or 600 IU) 24 h after pessary withdrawal on reproductive performance were investigated. Flushing decreased the interval from pessary withdrawal to onset of oestrus (59.3% of females exhibited oestrus within 36 h v 34.6% of controls, P<0.05), as did PMS treatment (57.1 and 64.3% of flushed females receiving 300 and 600 IU PMS resp. and 35.6 and 64.5% of control females coming into oestrus within 24 h of pessary withdrawal), whereas none of the females which did not receive PMS exhibited oestrus by this time (P<0.01). Treatment did not affect the duration of oestrus. The CR was >20% higher in females which had been injected with 300 IU PMS than in those which had received 600 IU or had not been injected.