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Effects of dietary starch on ovarian physiology, intra-follicular milieu of the preovulatory follicle, and plasma metabolites in postpartum dairy cows
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- Author / Creator
- Subramaniam, Elango
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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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- Subjects / Keywords
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- Graduation date
- Fall 2011
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- Type of Item
- Thesis
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- Degree
- Master of Science
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- License
- This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.