Synchronisation of oestrus in lactating Hungarian Combing Wool Merino ewes outside the normal breeding season

Draskoczy, J.

Magyar Allatorvosok Lapja 28(9): 487-488, 493-495

1973


ISSN/ISBN: 0025-004X
Accession: 000213717

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Abstract
Synchrovet premix (2.5% ethynodioldiacetate; 0.6% mestranol) was administered orally (15 g/day for 12 days) in Nov. 1970 to 210 Hungarian Combing Wool Merino ewes aged 4-7 yr, each of which had lambed in both Feb. and Oct. 1970. Ewes exhibiting oestrus within 25 days after treatment were doubly hand-mated (12-h interval) with Merino rams. Incidence of oestrus within 1, 5, 25 and 30 days resp. was 13, 31, 94.3 and 97.6%, av. service period 59 plus or minus 15 days, CR was 97.6%, embryo mortality 1.4%, and incidence of twinning 7%. In a 2nd experiment, carried out in July-Aug. 1971, 264 ewes (including those used in the 1st experiment and those rejected for various reasons at that time) in the 2nd mth of lactation were given 7.5 g Synchrovet daily for 12 days, followed on the 13th day by an injection of 800 IU PMS. Oestrous ewes were mated as before but, in addition, were inseminated post oestrus with Suffolk semen. Incidence of oestrus within 15 and 35 days resp. was 17 and 89%, av. service period 70 plus or minus 15 days, CR was 93.0%, embryo mortality 4.5%, and twinning 8%. No crossbred lambs were born. 20 ewes judged pregnant (on a NR basis) were allowed to lactate for 35 days after weaning. Milk production averaged 11 litres, CR was 90%, and embryo mortality nil.