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THE EFFECT OF ENERGY INTAKE AND ICI 33828 ON OVULATION RATE IN SWINE

Increasing the level of energy intake of gilts has been shown to increase ovulation rate, but the exact hormonal mechanism by which this phenomenon occurs is unknown. Different quantitative changes in the pituitary content of LH and FSH of gilts on high and low energy intakes were reported, however, by Kirkpatrick, Howland, First & Casida (1967). They also noted a higher progesterone content of the corpora lutea from gilts on high energy than from those on low energy intake.

Methallibure (ICI 33828) inhibits the release of pituitary LH and FSH in swine (Garbers & First, 1969). Gilts receiving the compound showed a lower level of luteal progesterone than control gilts on Day 8 but a higher level on Day 16 (Stormshak, Leverage, Kelley & Gerrits, 1970).

The present study was conducted to determine