Suprelorin - the hormone suppressor

Using Suprelorin Implants in Breeding Cats: 

A Breeder’s Perspective

Over recent years, Suprelorin implants have become an increasingly useful tool within many breeding programmes. While once more commonly associated with dogs, their use in cats is now growing steadily, largely through shared breeder experience rather than formal guidance.

For many of us, the appeal lies in flexibility. 

The implant offers a way to temporarily pause breeding, while also giving them a genuine break from the physical and behavioural demands that come with being entire.

In practice, Suprelorin has been used in a variety of ways. Some breeders choose to implant young males before they begin stud work while others use it with proven males after a litter to allow them time to recover condition.

There is also increasing, though still more limited, experience in queens. From what has been observed so far, the effects appear broadly similar, with most returning to season at around the 12 -14 month mark, although variation is to be expected.

The implant itself is simple for a vet to administer. It can be placed either near the navel, useful if you would prefer the option of removal or between the shoulders, like a microchip, where it is left to wear off naturally.

One of the most noticeable differences during the implant period is in overall condition. Cats are effectively given time off, and many seem to make very good use of it.

Rather than putting on excess weight, many develop better muscle tone, particularly across the shoulders and hindquarters. This can make a real difference, especially in cats that have been used for breeding and have started to lose condition or appear a little “light” in their behind.

Just as importantly, there is often a clear improvement in general wellbeing. Queens are no longer cycling repeatedly and males are no longer driven by constant hormonal pressure. The result is usually a calmer, more settled cat.

For those managing multiple cats, this is often where the implant really proves its value.

Entire males can be challenging to live with, particularly together. However, during the implant period, many breeders report that males can cohabit peacefully, something that would rarely be possible otherwise. The change in temperament can be quite striking, with cats behaving much more like neuters.

Queens also benefit in this respect. After raising litters, particularly during busy seasons they often become more relaxed, maintain their weight more easily, and integrate more smoothly back into the household.

Quite simply, life tends to become a bit easier for everyone.

As with any management tool, there are a few things to consider.

Timing is important, particularly in young males. Early use may influence development, especially head type, in a similar way to early neutering. For breeds where this is a key feature, particularly British Shorthair, it may be worth waiting until the cat has matured more fully before using the implant.

The effects are temporary, and as the implant wears off, fertility returns. In males, this can usually be tracked by a gradual increase in testicular size. There is no exact timetable, so a degree of patience is sometimes needed. For those wanting more control, placement near the navel allows the option of removal.

One of the most reassuring aspects for breeders is that cats who have previously been implanted have gone on to breed normally, producing healthy kittens with no apparent issues linked to the implant.

This makes Suprelorin a particularly attractive option for those who want flexibility without closing the door on future breeding plans.

Suprelorin is not a one size fits all solution, but it has undoubtedly earned its place as a helpful and welfare friendly tool in many breeding programmes.

At its best, it allows us to give our cats something that is often difficult to provide in a busy cattery… a proper pause. Time to regain condition, reset behaviour, and simply be a cat again.

For many breeders, that balance between practicality and welfare is exactly what makes it so valuable.

Eleanor Gray