When sorting through antlers recently and selling various sets, I realised that female reindeer Marple has been kind enough to give us hers for the last three years in a row, which is very unusual. By ‘give’, I mean that she cast them in the hill enclosure, giving us a higher chance of coming across them as compared to losing them outside the fenced area – where they are rarely found. How kind of her!
Although I don’t have any of the sets here anymore, I do retain photos of each set sold for my records, so this seems like a good opportunity to talk about similarities from year to year for antler growth for a particular reindeer.
Marple grows what I would classify as a very ‘typical’ set of antlers for a reindeer – average size for cow antlers, with a ‘blade’ at the base on one side (the tine which comes down towards the nose), front points – originating a little higher – pointing forwards somewhat like a stag beetle’s pincers, and then upright shafts which have multiple tines coming off them.
One of my most regular questions on the Hill Trip is whether or not reindeer grow the same shape of antlers each year. The answer is emphatically a yes, though by no means identical. The photos below show Marple’s antlers from age 3, 4 and 5, and you can see they have the same basic layout from year to year.
But antlers vary hugely, so here’s a composite photo of a ‘pair’ of antlers from two very different bull reindeer, by way of illustrating the differences between individuals whilst still showing the basic layout of the blade, front points and upright sections.
So what affects how antlers vary from reindeer to reindeer? The answer is primarily genetics. Antler growth is genetically inherited, so a reindeer with parents with rather simple antler growth is unlikely to grow anything too fancy, and vice versa. One of the reasons that our big lad Sherlock grows such enormous antlers is that genes for excellent, huge antler growth run in his family line; both his mum Caddis and dad Atlantic grew huge antlers themselves – Caddis exceptionally so for a female. Marple grows very similar antlers to her mum Ochil, as seen below:
Environmental factors affect antler growth too. Having enough energy to grow good headgear is dependent on being in good enough condition, so the grazing abundance and quality is important, which is obviously heavily influenced by the weather. Really hot weather can mean reindeer spend more time lying on snow patches to keep cool, or jogging about to try and evade flies that are buzzing around them, leading to less available grazing time. As I write it’s early July and 9 degrees and raining outside. I’m still having to wear a thermal top under my normal layers and I’m generally pretty grumpy about that fact, but the reindeer are loving life – grazing constantly with no flies around them at all. Every cloud…
Finally, a big part of antler growth is to do with body condition. This can be linked to environmental factors as we’ve just talked about, but other things also affect it, for example illness. A reindeer fighting an illness concentrates their energy on preserving body condition, and antler growth pauses as a result. It will start again if and when the reindeer recovers, but the damage is done and the antlers end up smaller, or slightly malformed, compared to a ‘normal’ year.
Female reindeer raising a calf need lots of energy to produce milk, so their antlers often suffer over the summer months, being smaller and often rather wonky. Some reindeer are prime candidates for this – looking at you, Merida! – whilst Marple actually doesn’t struggle too much. At 6 years old she’s in the prime of her life and has energy to spare, so both a big calf and decent antlers in the same season are achievable. However, the difference is still noticeable to some extent: here are those three photos again – the first pair grown when Marple was three, with no calf at foot, and the second two grown in the subsequent years but both times with a calf at foot. The first pair are slightly taller and perhaps a little more elegant, whilst the others are a touch shorter and a bit ‘squatter’ (although a little chunkier as Marple matured).
If you want to read more about antlers you’ll find all sorts of other blogs about them if you dig around in the archives here, including the difference between antlers and horns; the antler growth process; how they grow so fast; how the antlers strip away the velvet skin; bull Pera’s extraordinary antlers and why some reindeer never grow antlers at all. The most recent covers how we go about selling them too.
Hen
