Effects of dietary starch on ovarian physiology, intra-follicular milieu of the preovulatory follicle, and plasma metabolites in postpartum dairy cows

  • Author / Creator
    Subramaniam, Elango
  • Effects of dietary starch content on ovarian dynamics in lactating dairy cows and intrafollicular milieu of preovulatory follicles were studied. Diets containing two levels of starch (29.2% and 19.1%) were fed until 84 d post-calving. Diets had no effect on the interval from calving-to-ovulation, but a greater proportion of cows on high starch diet ovulated two or more follicles at first ovulation. Cows consuming a high starch diet had higher concentrations of insulin in plasma, IGF-1 in follicular fluid, and lower concentrations of non-esterified fatty acids (NEFA) in both plasma and follicular fluid. Primiparous cows had higher concentrations of IGF-1 and NEFA, and lower concentrations of urea in plasma than multiparous cows. Reproductive hormones and gene expression in granulosa cells were affected neither by diet nor parity. Although a high starch diet increased insulin and IGF-1, and reduced NEFA, it did not hasten resumption of cyclicity in postpartum dairy cows.

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  • Degree
    Master of Science
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