Help! I feel like such a dweeb here but here goes. So there's medicated and unmediated chick starter, grit, crumble, laying pellets, scratch.. what else? I have 3 laying hens and rooster. I suspect that my hens are starting to mol. What do I need to get them to get them through it faster? They've been getting crumble with some scratch and grit I mix it. Am I giving them the right nutrition? They get kitchen treats randomly.
Your thread title sounds like you want a quick 101.
There is a tag on every bag with a guaranteed analysis, list of ingredients and usually feeding instructions.
Nutritionally, there are 2 things on the guaranteed analysis tag that one must always look at - protein % and calcium %. Calcium is pretty simple.
Birds actively laying eggs should have about 4% calcium. Birds not laying eggs (growing birds, roosters, molters, etc.) shouldn't get that much.
All feeds other than 'layer' have about 1% calcium which is sufficient if not building egg shells.
With protein, chicks need more protein and that can be cut back as they mature. Roosters don't need much. Hens need a bit more because they're putting out a 6 gram lump of protein each day.
In types of feed there are things called starter, grower (or a combination like purina start & grow) finisher, all flock, layer
There are exceptions but in general, Starter is usually from 18% - 22% protein and for birds from hatch to about 7 or so weeks of age. Grower is usually 18% and for feeding until onset of lay.
Finisher is about 15% and is for the last couple weeks of a broiler's life and can be fed to roosters and pullets prior to onset of lay.
All flock can be from 18-20%.
They all can come in the form of mash, crumbles or pellets. Mash is usually just ground and mixed. Pellets are ground, mixed with a binding agent added and run through a pelletizer. Crumbles are pellets after being run through the crumbler.
Basically there is no difference nutritionally regardless of the form.
To make things simple, you can just feed a starter/grower till onset of lay and then if all the birds are laying, switch to layer. If a mixed flock, feed a grower or all flock feed and make sure there is always oyster shell available in a separate container.
Oyster shell is 95% calcium carbonate. Egg shells are calcium carbonate. Calcium carbonate and calcium aren't exactly the same thing. Calcium carbonate is 40% calcium. Any source of calcium carbonate is broken down into calcium ions and carbon ions in the digestive tract, enter the bloodstream and are reformulated into calcium carbonate in the egg shell gland.
2.5 grams of elemental calcium is needed to make an egg shell. Only half of the calcium in the diet is retained so 4-4.5 grams are needed in the daily diet to retain the 2.5 grams needed for the egg.
Oyster shell and grit are not the same thing. Grit is insoluble stones like flint or granite. Oyster shell is soluble and by the time it gets to the gizzard it is pretty mushy.
Grit is essential in the diet so it can lodge in the gizzard to aid in grinding food. Basically, grit serves as a bird's teeth.
Birds that forage a large area with adequately sized stones can get sufficient grit from the ground.
Some say that if one only feeds a commercial chicken feed that grit isn't essential since the ingredients are already ground. Essentially, that's true but most people feed other things and grit in growing birds helps to develop the gizzard.
It has to be the correct size (3 sizes for chickens). If it is too small, it will pass right through the gizzard and not be of much assistance. So if buying grit, #1 chick grit is for birds up to 3 weeks of age, #2 is for up to 7 weeks and #3 adult grit is for over 7 weeks of age.