Showing posts with label spayed females. Show all posts
Showing posts with label spayed females. Show all posts

Saturday 23 December 2023

Effect of sterilisation on body weight, metabolic rate and glucose tolerance of domestic cats

This short post is based upon a study published online in March 1997. The concern is quite a well discussed topic, that of domestic cats putting on weight after they've been neutered (males) or spayed (females). I am only able to see the study's summary.

Effect of sterilisation on body weight, metabolic rate and glucose tolerance of domestic cats
Image: MikeB using Canva. Feel free to use it but please credit me and link back to this page.

This study found that "the castrated males gained more weight as fat than the sexually intact males". And "the neutered males gained significantly more weight than the entire males".

Further, "There was a significant increase in daily food intake after neutering.".

Neutered males gained weight faster than entire (unsterilised) females.

The scientists also said that "Spayed females underwent a significant decrease in fasting metabolic rate". I take this to mean that the spayed female cats had a slower metabolic rate when they were not eating i.e. fasting. It is not stated in the study but it would seem reasonable to conclude that with a lower metabolic rate there is a greater chance of fat being stored because less energy is being used and therefore the food is being burnt up at a slower rate.

They found that there was no or little effect from sterilisation on glucose tolerance. I take that to mean that there is no impact on domestic cats in terms of a predisposition towards Type II diabetes but that is my personal interpretation and it is not stated in the study.

The term 'gonadectomy' is often used by scientists to mean the removal of female testes and the female's ovaries. In other words, sterilisation of both sexes of cat.

Comment - my views


The advice given by veterinarians is to modify your male and female cats' diet after the neutering and spaying operations. I think the operation will affect different cats differently. My cat did not put on weight and was always relatively skinny and only now when he is in middle age is he putting on a little bit of weight. I delayed his neutering operation as long as possible but was pressured by the veterinarian to have it done as soon as possible. I resisted that pressure.

Extruding penis


There is another study online which says that neutering a pre-puberty male cat can leave the cat unable to extrude his penis which would be a scientific way of saying having an erection! I'm not sure this is true although the study was completed by a PhD student. She said that 100% of male cats neutered before puberty were unable to have an erection. I don't believe that at all. 

I have first-hand evidence because my cat gets boners all the time and he was neutered after puberty but there may be an issue here is to whether you neuter a male cat before or after puberty which is about seven months of age in order to allow the male cat to retain some normal malfunction and appearance. In this instance I'm talking about the facial appearance specifically the jowly, square, larger face of the intact male tomcat.

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P.S. please forgive the occasional typo. These articles are written at breakneck speed using Dragon Dictate. I have to prepare them in around 20 mins.

Study: Effects of neutering on bodyweight, metabolic rate and glucose tolerance of domestic cats. Link to the study: https://doi.org/10.1016/S0034-5288(97)90134-X.

Saturday 3 December 2022

Neutered male cat wants to mate with a spayed female in the same household. Why?

A cat owner on the Reddit.com website finds it difficult to understand what their male cat is doing to their female cat. They are both sterilised. The male cat is neutered, and the female cat is spayed. Therefore, the female cat doesn't come into heat. Why is the male cat pestering the female for sex?!

Neutered male cat wants to mate with spayed female
Neutered male cat wants to mate with spayed female. Image: u/Ok_Reference2122 on Reddit

The owner of the cats asks: "What is my cat doing to my other cat??? He will do these little chirps and follow her around mounting her like this but why? They are both fixed so he can’t be in heat."

My answer on Reddit was: 

"Neutered male cats might still desire to have sex with a spayed female cat. They may also desire to have sex with their owner's arm! The drive to mate is still there despite being neutered and the removal of testosterone. It's in their DNA. So being fixed does not stop this but it depends upon the individual cat. The little chirps he makes is a sign of excitement before mating."

The fact of the matter is that male cats even after being neutered and therefore even after the stopping of the production of testosterone, can still have a drive to mate with a female even when that cat is herself neutered.

And sometimes male cats have sex with their owner's arm or perhaps a leg or some other similar object. We see this quite a lot with dogs as well.

RELATED: Reason why some dogs try to mate with your leg.

Clearly, the drive by a male cat or dog to mate with a female is in their DNA and they will try and do it even if it is impractical. It becomes instinctive and illogical sometimes because they want to have sex with your arm.

It's just this internal drive and a lack of testosterone doesn't stop it in some individuals. I think this is very much about individuals and how they personally react to being neutered.

I speak from first-hand experience by the way because my cat has sex with my arm every day! I let him do it because it pleases him. There is a duty on all cat owners to please the domestic cat and it doesn't do me any harm so why stop it!?

For most dogs, the environment is sterile in terms of opportunities to mate with females. Forgive the pun. There is no opportunity and therefore they dive for the nearest object which is a substitute such as their owner's leg or the leg of an armchair or something like that.

It's all normal and dogs and cats should not be criticised for this behaviour. It's just that humans put them in a world where this kind of 'strange' (to humans) behaviour happens. From the dog or cat's perspective it is not strange but entirely normal.

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