Download PDF by Jo Cleland: Achoo!

By Jo Cleland

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Additional info for Achoo!

Example text

Such ability to increase the conception rate by reducing embryo mortality is clear evidence that not all embryonic mortality in cattle is predetermined. However, not all studies with GnRH have shown unequivocal evidence of increased pregnancy rates. In fact, a review of earlier literature had led Drost and Thatcher (1992) to conclude that there was no clear evidence that treatment with GnRH between days 11 and 14 after breeding would result in increased conception rates. Ellington et al. (1 99 l), in the USA, evaluated the use of a GnRH analogue in recipient cattle and recorded a non%gni5cant tendency for conception rates to increase.

Of heifers inseminated No. of heifers with embryos (“’0) Fertilization rate (%) No. 05). rates have varied from 83% to loo%, with an overall mean of 90%. In Ireland, workers recorded a fertilization rate of 90% in heifers, using AI with frozenthawed semen (Diskin and Sreenan, 1980). The same workers concluded that fertilization failure accounts for only about 10% of the overall reproductive failure in heifers whereas embryo deaths account for more than 30%. Available evidence suggests that fertilization failure probably accounts for about 10-1 2% of conception failure and shows little difference between heifers and cows or between the use of frozen-thawed semen and the bull in natural service.

The evidence suggests that there is probably synchronization of sperm movement and ovulation in the cow, which has the effect of bringing relatively small numbers of sperm from the reservoir in the caudal isthmus to the ampullary region of the oviduct (see Fig. 5). In nature, Chapter 1 14 Fig. 5. Diagrammatic representation of the sperm reservoir in the isthmus and site of fertilization in the ampulla of the oviduct. the cow is served by the bull during the period of oestrus and sperm would normally be in the reproductive tract several hours prior to the occurrence of ovulation (which occurs about 10-12 hours after the end of the heat period).

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Achoo! by Jo Cleland


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