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The dual-purpose chicken selected by the Lohmann group, the “Lohmann Dual”, [50] is raised in Switzerland by a few breeders, and the Coop network decided to launch the experiment with a test on 5,000 poultry, although knowing that instead of producing up to 300 eggs per year like very good laying hens, it will only produce around 250 eggs ...
Egg laying hens require 4 grams per day of calcium of which 2 grams are used in the egg. Oyster shells are often used as a source of dietary calcium. [4] Certain diets also require the use of grit, tiny rocks such as pieces of granite, in the feed. Grit aids in digestion by grinding food as it passes through the gizzard.
The Lohmann Brown is a brown variety of chicken, specifically bred for egg-laying purposes. It is a crossbred line [1] and is selectively bred from lines of the Rhode Island breed. [2] They start to lay eggs at about 19 weeks and produce up to 320 eggs up to an age of 72 weeks (one year production).
Leghorns are good layers of white eggs, laying an average of 280 per year and sometimes reaching 300–320, with a weight of at least 55 g. [6] White Leghorns have been much used to create highly productive egg-laying hybrids for commercial and industrial operations. [11]: 161
Sex-links come in several varieties. As hybrids of laying or dual-purpose breeds infused with extra vigor via heterosis, sex-links can be extremely good egg-layers which often produce 300 eggs a year or more depending on the quality of care and feed. The color of their eggs vary according to the mix of breeds, and blue-green eggs are possible.
Hatching eggs should weigh at least 58g. In the early 20th century Croad Langshans became a popular utility breed, doing well in laying trials. The hens lay 140-150 eggs a year and are good winter layers; the eggs are dark brown with a plum-coloured bloom. The hens are excellent sitters and mothers.