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Discuss the formation of an egg in a hen.
Biology
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Uundaji wa yai ndani ya kuku ni mchakato unaochukua takriban masaa 24-26 na hufanyika katika sehemu mbalimbali za mfumo wa uzazi wa kuku (oviduct).
- Ovari na Kiini cha Yai (Yolk): Mchakato huanza kwenye ovari, ambapo kiini cha yai (yolk) huundwa na kukua. Yolk huundwa na mafuta na protini. Kuku anaweza kuwa na mamia ya viini vya mayai vinavyokua kwa wakati mmoja, lakini kimoja tu hukomaa na kutolewa kila baada ya masaa 24-26.
- Infundibulum (Funnel): Yolk iliyokomaa hutolewa kutoka kwenye ovari na kuingia kwenye infundibulum, sehemu ya kwanza ya oviduct. Hapa, ikiwa kuku amepandwa, mbegu za kiume zinaweza kurutubisha yai. Yolk hukaa hapa kwa takriban dakika 15-30. Pia, chalazae (nyuzi zinazoshikilia yolk katikati ya yai) huanza kuundwa hapa.
- Magnum: Baada ya infundibulum, yolk husafiri kwenda kwenye magnum, sehemu ndefu zaidi ya oviduct. Hapa, protini za yai (albumen au ute wa yai) huongezwa kuzunguka yolk. Albumen huundwa na tabaka nne tofauti na huchukua takriban masaa 3.
- Isthmus: Kisha yai huhamia kwenye isthmus. Katika sehemu hii, utando wa ndani na wa nje wa ganda la yai (shell membranes) huundwa kuzunguka albumen. Utando huu hutoa ulinzi na huchukua takriban saa 1 na dakika 15.
- Uterus (Shell Gland): Baada ya isthmus, yai huingia kwenye uterus (pia inajulikana kama shell gland). Hapa ndipo ganda gumu la yai (shell) huundwa. Calcium carbonate huwekwa kwenye utando wa ganda, na kuunda ganda gumu. Rangi ya ganda la yai pia huongezwa hapa. Mchakato huu ndio mrefu zaidi, ukichukua takriban masaa 18-20.
- Vagina na Cloaca: Baada ya ganda kukamilika, yai husafiri kupitia vagina na kutolewa kupitia cloaca. Kuku hulitaga yai, na mchakato mzima hurudiwa kwa yai linalofuata.
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