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The Calcium reserves of a Zeba Finch Scientist reported that zebra finches will deplete the calcium reserve after the 5th egg. The study showed a five-egg clutch has a total calcium requirement of 89 mg, but the total calcium reserve of a female is only 90 mg.
RAZA ESPAÑOLA CANARY/ SPANISH RAZA - History - Standard Description
RASMI BOLAND CANARY - History - Characteristics & Standard

Lighting, Temperature & Feeding – the most important

factors for a successful Canary keeping and breeding

Part 1: Lighting

1.4 What is more to consider? - When purchasing birds, always find out the duration of daylight in the breedingroom of the seller and maintain or adjust it. Not infrequently, a bird gets into the moult during a drastic change. - It is recommended to install a 15-30 minute automatic dimming phase before switching on the full power of light and especially after switching off, which replaces the sunrise and sunset. This avoids that the birds do not get scared when suddenly switching on the light and specially find the way to the nest when dimming before complete darkening. Some breeder also install a small lamp in the breeding room that stays on all night, as a kind of moonlight. - Increase and reduce the daylight hours slowly in steps of only 15 minutes weekly. Don’t just set your timer from 10 hours up to 14 hours per day though. That would be too much of a shock for your canaries and may adversely affect their health. Sudden changes can lead to a “soft” or “shock” moult or decreased immunity to illness. (see Lighting Schedule...>). - Even with exhibition birds a possible light fluctuation is to be included. Many prestigious exhibitions have uniform duration of light. - When purchasing birds, always find out the duration of daylight in the breedingroom of the seller and maintain it. Not infrequently, a bird gets into the moult during a drastic change. - full-spectrum lighting to simulate the benefits of natural sun for increased success rates in the breeding room. The product preconditions are: Daylight/ 6500 Kelvin. (more information about birdroom lighting...>).
1.Duration of Daylight 1.0 Introduction: Today, the domesticated canary bird is kept and bred worldwide as an pet bird. In countries that are similar in terms of daylight and temperature to the country of origin (such as Europe, America, etc.), keeping / breeding should not be particularly demanding. Birkeeper / breeder in countries with significant deviations (such as Thailand, India ...) should take the necessary measures to meet the requirements. (... examples of the duration of daylight in different countries...>) This also applies to breeders who keep canary birds under "non-natural" conditions (indoor breeding), and may want to bring forward a breeding start possibly artificially. These measures require an installation of artificial daylight with automatic timer. However, the possibility of manipulating the normal course of the year must not be allowed to leave the birds in the breeding condition all year round, because in order to achieve optimal results, the birds must also be able to regenerate. The process breeding, moulting and resting is to be kept, only - from the natural norm deviant - artificially moved. Here the overview what is to consider if I use artificial lighting: (The following explanations on the subject of changing the daylight duration for the breeding, moulting & resting season must to be carried out step by step. (A drastic change can have devastating consequences for the bird's health. (see an on experience based Lighting Schedule).
1.1 Breeding Season: When the daylight has a duration of minimum 12 hours the time for breeding is come. With this daylight duration a process takes place in the body, which increases the hormones for the breeding. As a total minimum of light duration 14 hours are recommended. The maximum is 15 hours. NOTE:  - Some breeders even report a total light duration of up to 16 hours, which is said to result in an allegedly better feeding of the chicks. Fact should be that the right lighting and temperature, but also balanced feeding bring the birds into the best breeding condition and reduce the chick mortality as the female feed more hours per day. - It is also reported that more thant 15 hours lead to abnormal moult, which brings the breeding season to a screeching halt.
1.2 Moulting Season: After the longest personally determined interval for the daylight duration has been reached, it is important to prepare the start of moulting, in which the day length again is dropped. This process leads to a change in the hormones so that the moult is triggered. Correctly seen, the preparation for the next breeding starts again with the moulting season. This applies not only for moulting season but also for the resting season. Here, the main essential basic for a successful next breeding are set. If these periods are not strictly respected to, the next brut period is already doomed to failure. Starting from a recommended maximum daylighting time of 15 hours, the  moulting will start between 12-13 hours, one bird earlier, the other a little later. In healthy canaries the moult lasts generally 6 -8 weeks. Then the resting season starts for the canary.
1.3 Resting Season: The resting season is there for the bird to build up new power reserves for the upcoming breeding season. As already described in the chapter moulting season, the attention of this season is of great importance for the next breeding season. The canary bird receives here the appropriate physical regeneration, which is guaranteed by sufficient resting due to only 9 hrs of daylight length.
Urucum Canary/Red Beak Canary - History  - Characteristics
Bec Jaune/Yellow Beak Canary - History & Characteristics