SIX YEAR (1986/87-1991/92) SUMMARY OF IN UTERO PRODUCTIVITY OF MOOSE IN MANITOBA, CANADA
Information on in utero productivity of moose in Manitoba for the period 1986/87 - 1991/92 is discussed. Age specific pregnancy rates are reported. The twinning rate was 15.6%. The sex ratio of foetuses significantly favoured females in one game hunting area (GHA). The average conception date was September 29 with 92.6% of the cows being bred by October 12. The median breeding date was September 26. There was a significant difference in the sex of fetuses produced before and after the average breeding date with more females produced earlier in the breeding season. The overall ovulation rate was 1.12 corpora lutea/female and 1.03 fetuses/female. A total of 173 corpora lutea were found and 160 calves suggesting a 7.7% loss of ova through early embryonic mortality or fertilization failure.
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