VIABILITY OF ONE-CELL SHEEP OVA AS AFFECTED BY HIGH ENVIRONMENTAL TEMPERATURE

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Abstract
NO difference was found in the viability of unfertilized sheep ova transferred from donors maintained at 70 or 90[degree] F to mated recipients maintained in constant 70[degree]F. However, reciprocal transfers of fertilized ova indicated that the reproductive tract of ewes maintained at 90[degree] F did not provide as favourable an environment for embryo development as did the tract of ewes maintained at 70[degree] F. Control ewes maintained in constant 70[degree] F had a significantly higher level of fertility than ewes maintained in a room with constant 90[degree] F. Data obtained from ewes shifted from one air temperature to another indicated that most of the decrease in fertility due to the high air temperature had occurred by the end of oestrus in these ewes. Differences were noted in the fertility of two age groups of ewes, but this difference did not affect the ova before fertilization as indicated by transfer of ova between groups.

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