Estrus synchronization in sheep with synthetic progestagens |
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| Authors: | Hayatu Awel Lisanework Eshetu Gebrehiwot Tadesse Alemselam Birhanu S K Khar |
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| Institution: | (1) Faculty of Veterinary Sciences, Mekelle University, P.O. Box: 231, Mekelle, Ethiopia;(2) Mekelle University, P.O. Box: 3110 Mekelle, Ethiopia; |
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| Abstract: | Sixteen female sheep of Degua breed were assigned to receive either the full dose of norgestomet ear implant and injectable
solution containing norgestomet and estradiol valerate (n = 8) or half the dose (n = 8). The ear implants were removed in
both groups on day 12. All ewes received an intramuscular administration of 500 IU PMSG at implant withdrawal. Synchronized
ewes were individually hand mated twice at 48 and 60 hours after implant removal. One ewe in each group however refused mating
on both occasions. Pregnancy diagnosis was conducted by bimanual external palpation 90 to 100 days post mating. The conception
rates (3/7, 42.85%) and (5/7, 71.42%) were recorded in the two treatment groups, respectively. All eight ewes lambed between
145 to 153 days post mating. In group I ewes carried only singletons (prolificity rate 1.0) whereas in group II two ewes delivered
twins, producing 7 lambs with prolificity rate of 1.4 (N.S). From this preliminary investigation it appears that the lower
dose of norgestomet ear implants offers better option for estrus synchronization accompanied by higher fertility. |
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