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The house finch is a moderate-sized finch, 12.5 to 15 cm (5 to 6 in) long, with a wingspan of 20 to 25 cm (8 to 10 in). Body mass can vary from 16 to 27 g (9 ⁄ 16 to 15 ⁄ 16 oz), with an average weight of 21 g (3 ⁄ 4 oz).
Eggs hatch at the same time, after a short incubation period lasting 11–14 days, and exceptionally for as many as 17 or as few as 9. [8] [132] [163] The length of the incubation period decreases as ambient temperature increases later in the breeding season. [164] Young house sparrows remain in the nest for 11 to 23 days, normally 14 to 16 days.
In the latter, the eggs develop in utero for about 28 days, with only about 10 days of external incubation (in contrast to a chicken egg, which spends about one day in tract and 21 days externally). [11] After laying her eggs, the female curls around them. The incubation period is divided into three phases.
Cut-throat finches usually use nests constructed by other birds . A clutch usually consists of 3 to 6 white eggs, which hatch after an incubation period of 12–13 days. [8] The chicks leave the nest after 21–27 days but continue to be fed by their parents for a further three weeks. [9]
Removing some of the eggs and artificially incubating or fostering them may be beneficial. [11] The species usually breeds year-round; incubation times are from 18 to 23 days before chicks hatch. The hen cares for the chicks until around 4 weeks of age, when they should be separated from parent birds into a separate aviary.
Eggs are white, with fine reddish brown dots that are concentrated at the larger end. On average, eggs are 1.52 cm × 1.22 cm (5 ⁄ 8 in × 1 ⁄ 2 in), and there are usually six to eight eggs. Incubation lasts 11–14 days and is by the female only; the male feeds her during this time. [11]
Mycoplasma gallisepticum (MG) is a bacterium in the class Mollicutes and the family Mycoplasmataceae. It causes chronic respiratory disease (CRD) in chickens and infectious sinusitis in turkeys, chickens, game birds, pigeons, and passerine birds of all ages. [ 1][ 2] Mycoplasma gallisepticum is a significant pathogen in poultry.
In an aviary they lay eggs and crowd into a single nest, interfering with incubation (which is performed by the female and lasts 16 days) or damaging the eggs. Thus they breed better if kept as single pairs in individual breeding boxes. [2] This sociability is also responsible for their American name of "society finch."
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