Twenty animals were initially synchronised, although three animals were excluded from
all subsequent analysis as they failed to develop a functional CL and had undetectable
plasma progesterone concentrations by day 5 post-oestrus. Of the remaining 17 cows, viable
embryos (n = 15) were recovered from 11 cows (65%). These animals had embryos at the morula (n = 3 cows), 8–16 cell (n = 3 cows) and 8-cell (n = 5 cows) stages of development.
Embryos at the morula stage of development were recovered from the uterus (n = 2 cows)
and oviduct (n = 1 cow) while embryos at earlier stages of development were all recovered
from the oviduct. In the remaining six cows, empty zona pellucidae without embryonic cells
were recovered from two cows, two unfertilised oocytes from one cowand no structure from
three cows. Double ovulations were detected in 6 (35%) of the 17 cows, in which viable
embryos were recovered from 4 cows. In all four cases, both embryos were at the same
stage of development (morula stage (n = 1 cow), 9–16 cell (n = 2 cows) and 8 cell (n=1
cow).
Twenty animals were initially synchronised, although three animals were excluded fromall subsequent analysis as they failed to develop a functional CL and had undetectableplasma progesterone concentrations by day 5 post-oestrus. Of the remaining 17 cows, viableembryos (n = 15) were recovered from 11 cows (65%). These animals had embryos at the morula (n = 3 cows), 8–16 cell (n = 3 cows) and 8-cell (n = 5 cows) stages of development.Embryos at the morula stage of development were recovered from the uterus (n = 2 cows)and oviduct (n = 1 cow) while embryos at earlier stages of development were all recoveredfrom the oviduct. In the remaining six cows, empty zona pellucidae without embryonic cellswere recovered from two cows, two unfertilised oocytes from one cowand no structure fromthree cows. Double ovulations were detected in 6 (35%) of the 17 cows, in which viableembryos were recovered from 4 cows. In all four cases, both embryos were at the samestage of development (morula stage (n = 1 cow), 9–16 cell (n = 2 cows) and 8 cell (n=1cow).
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