We are currently having a discussion on a suitable dog food for pancreatitis - link. This has led us into the area of calculating and comparing fat level in dry and wet food. I do not want to hijack that particular thread so I thought it might be useful to continue the discussion as a separate topic.
Dry matter basis is a measuring tool for the key constituents of dog food. On the All About Dog Food website, the dry matter measurements are given for protein, fat, fibre, carbohydrates and ash. As I understand it these figures are reached after all the moisture is removed from the product.
Here is a quote from David lifted from the aforementioned thread:
In order to compare fat contents in different types of foods (dry vs wet vs raw etc) you do indeed have to work out the dry weight value which can be a real headache. Fortunately, we've thought of that and every product on the AADF website has a dial for the dry weight fat level in the Nutrition section of the review page. No matter what type of food you're looking at, these dials can be directly compared.You can also go to the Dog Food Directory and select the exact dry level fat levels you are looking for in the panel on the left under ‘Nutrient levels’. Again, since these are dry-weight, they work for all foods so no maths is required on your part.
- It is worth noting that we are talking about protein and other constituents in this thread, not just fat.
Manufacturers will give the typical analysis of their food which is different to the dry matter but the dry matter figure comes into play if you want to compare perhaps a wet canned food with a kibble. Most of us would struggle to do the necessary calculations but with the dry matter dials there is no need. I would imagine that the dry matter figures are particularly useful for those who have dogs with special dietary needs.
I have struggled to get my head around this - it does seem complicated, especially as the food that I am giving to my dogs today (Turkey Nutriment) has a dry matter fat level of 28.9%. I’m watching their weight so at first glance it is a bit alarming. However, the guaranteed analysis is 9.6% and they have lost weight.
There is more about the subject here. If I’ve got anything wrong I apologise but I am only just learning myself and look forward to understanding it a bit better so if anyone can help, it’s over to you…