Effect of Short or Standard Periods of Oestrus Suppression on Oestrus Synchronisation and Fertility in Gilts08 April 2015
A shorter-than-normal period (for 10 to 12 days) of progestagen-induced oestrus suppression followed by exogenous prostaglandin-induced luteolysis resulted in fertility comparable to that of gilts suppressed for the more usual 14 or 18 days, according to a new study in Italy.
Allyl trenbolone was fed at 20mg per day for 10, 12, 14 or 18 days, with two 75-μg injections of D-cloprostenol at last feeding at 10 or 12 days to synchronise oestrus in pubertal gilts.
There were no treatment effects on farrowing rate or subsequent litter sizes.
These are the conclusions of Roy Kirkwood of the University of Adelaide in Australia and co-authors there and at the University of Parma in Italy and the University of Chulalongkorn in Thailand from the results of their paper published in the current issue of Journal of Swine Health and Production.
They add that this information that will allow producers to fine-tune gilt availability for service and so ease the attainment of breeding targets.
De Rensis F., C. Mazzoni, R. Saleri, M. Techakumphu and R.N. Kirkwood. 2015. Effect of short (10- or 12-day) or standard (14- or 18-day) periods of estrus suppression with allyl trenbolone on estrus synchronization and fertility in pubertal gilts. J Swine Health Prod. 23(2):97-99.
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