Graduate Thesis Or Dissertation
 

The relationship of blood glucose levels to ovulation rate and early embryonic mortality in gilts

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  • A study was made of blood glucose levels and their relationship to reproduction in gilts. Twelve blood samples, two in each of three successive weeks, before and after breeding were taken. Half of the samples were obtained from gilts in a fasting state and half after feeding. All samples were analysed for glucose content. Feeding consisted of six pounds per gilt per day of a standard gestation ration fed once daily in a meal form. At 25 ± 1 days after breeding the gilts were slaughtered and a count was made of the corpora lutea, live embryos, and dead embryos. Fasting and post-feeding mean blood glucose levels were described and discussed for both the pre-breeding and post-breeding periods. Blood glucose content was higher after feeding than during fasting both before and after breeding (P < .001). The amount of rise, as well as mean blood glucose levels before or after feeding, was not significantly different when comparing the pre-breeding and post-breeding periods. The amount of variability in blood glucose content was also described and discussed. A significant (P < .01) quadratic relationship was found between pre-feeding blood glucose level and the number of days in gestation, but very little variation was explained thereby (r²=.049). Regressions and correlations of the reproductive measurements on various blood glucose measurements were calculated. The magnitude of difference between the pre-feeding and post-feeding blood glucose levels in the pre-breeding period had a significant negative correlation with ovulation rate, early embryo mortality, and total embryo mortality (P < .05, P < .01, P < .05, respectively). No similar relationship was found in the post-breeding period or over the experimental period as a whole. No significant relationship was found between reproduction and any of the absolute blood glucose levels. Regressions and correlations of the reproductive measurements on coefficients of variation of the blood glucose measurements indicated no significant relationships.
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