Prairie Swine Centre » Current strategies and technologies for reproductive management of gilts and sows -Banff 2017

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Estrus synchronization by controlling the luteal phase of the estrous cycle

Accurate daily dosing of altrenogest with gilts receiving 15mg/day and sows 20mg/day for 18-20 days
inaccurate administration leads to an increase in follicular cysts

Stimulation or controlling follicular development

Pregnant mare serum gonadatropin (PMSG) contains the appropriate FSH/LH ratios to stimulate follicular growth
Dosing ranges from 500-100 IU

Induction of puberty in gilts

PMSG induces estrus in 50-90% of prepubertal and peripubertal gilts within five days
The best response occurs when gilts are within 20-30 days of natural puberty
30% do not display signs but do ovulate
30% of those exhibiting estrus have irregular return to a subsequent estrus

Follicle stimulation after estrus synchronization with altrenogest in gilts

Altrenogest 14 days followed by a follicle stimulator 24 hours after the last feeding of Altrenogest synchronizes estrus in gilts

Follicle stimulation in weaned sows

Triggering follicular growth with PMSG at weaning results in a more uniform population of follicles and increases the percentages of sows in estrus within 5 days

Induction of ovulation

Mature follicles are simultaneously induced to ovulate with a gonadotropin of predominantly LH activity

Control of farrowing

Successful induction require treatment within 2 days of normal expected farrowing date