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The interbreeding of sheep and goats
D A Kelk1, C J Gartley, B C Buckrell
1Department of Biomedical Sciences, Veterinary Teaching Hospital, Guelph, Ontario.
Summary
Interbreeding sheep and goats resulted in fertilization but no viable offspring. Ram-goat crosses showed fertilization, but fetuses did not survive past 10 weeks, indicating reproductive incompatibility.
Area of Science:
- Reproductive biology
- Comparative genomics
- Animal breeding
Background:
- Sheep (Ovis aries) and goats (Capra hircus) are closely related species within the Bovidae family.
- Understanding interspecies reproductive compatibility is crucial for evolutionary studies and potential agricultural applications.
Purpose of the Study:
- To investigate the reproductive outcomes of interbreeding sheep and goats.
- To determine fertilization rates and embryonic survival in reciprocal crosses.
Main Methods:
- Ewes and does were artificially inseminated with semen from rams and bucks.
- Embryos were recovered and analyzed for fertilization success.
- Pregnancy was monitored in specific crosses (ram x doe).
Main Results:
- Fertilization rates varied significantly across crosses: ram x doe (72%), buck x doe (96%), ram x ewe (90%), and buck x ewe (0%).
- In crosses where fertilization occurred (ram x doe), fetuses showed developmental arrest and died between 5 and 10 weeks of gestation.
- No fertilization was observed in the buck x ewe cross.
Conclusions:
- Sheep and goats exhibit significant reproductive barriers, preventing the development of viable interspecies offspring.
- Fertilization can occur, but embryonic or fetal mortality is a critical limiting factor in sheep-goat hybridization.
- These findings highlight genetic incompatibilities that maintain species integrity.