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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 Open Access


Other title
Dairy cattle -- Feeding and feeds
Dairy cattle -- Reproduction
Type of item
Degree grantor
University of Alberta
Author or creator
Subramaniam, Elango
Supervisor and department
Ambrose, Divakar (Agricultural, Food and Nutritional Science)
Examining committee member and department
Oba, Masahito (Agricultural, Food and Nutritional Science)
Chang, John (Biological Sciences)
Dyck, Michael (Agricultural, Food and Nutritional Science)
Department of Agricultural, Food, and Nutritional Science

Date accepted
Graduation date
Master of Science
Degree level
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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