Newsgroup: it.discussioni.animali
Titolo: x Sebapop &  ladybat

Mi rendo conto che non sapete un c....o 

da uno che non sa come si riproducono le galline è pesante.....

 
come trollino sei ancora giovane ed ingenuo.
quando diventerai grande ne riparleremo.
Adesso da bravo, vai a fare i compiti su qualche altro NG e sparisci
-- 
via ieri, via oggi,
ormai non piu' un'oca selvatica
stanotte

 Mi rendo conto che non sapete un c....o
Uffa, non si può nemmeno ridere, adesso!
Quanti anni hai?
Comunque:
Qui c'è l'apparato riproduttivo di una gallina:
http://chickscope.beckman.uiuc.edu/resources/egg_to_chick/
Qui trovi delle spiegazioni sui loro apparati riproduttori. Buona lettura
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The Reproductive System
The Hen 
There are two main parts of the reproductive system of the hen-the ovary
and the oviduct. Only the left ovary and oviduct mature in a bird. The
ovary is attached underneath the backbone, about midway between the neck
and tail. When a female chick is hatched, the ovary contains all of the ova
(in miniature) it will ever have. 
The ovary begins to convert ova to egg yolks at the appropriate time. In
order for this to happen, the pullet (young female chicken) must have
reached the correct stage of physical development. Then, if the appropriate
light stimulation is present, hormones cause ova to develop in sequence to
yolks. 
Yolks are released from the ovary into the body cavity when they reach the
correct size. The ovulated yolk is retrieved by the infundibulum, the first
part of the oviduct. Completion of the egg will require approximately 24
more hours. Passage through the magnum, isthmus, and uterus of the oviduct
results in the addition of egg white, shell membranes, and shell. 
Soon after an egg is laid (oviposition), the process starts again. Another
yolk is released, and the next egg is formed. Some chickens and ducks can
lay an egg every day for more than 300 consecutive days. Other birds may
lay only a few eggs, and then only every second day.
The Rooster 
Sperm cells to fertilize the ovum are produced in the testes of the
rooster. The testes are inside the body, attached approximately in the
middle of the back. They are shaped like beans, and are cream colored in
immature birds and white in mature birds. 
When roosters reach about two-thirds of their mature body size, they are
capable of producing sperm. Important factors in stimulating them to
produce sperm are the number of hours of light each day and whether the
time of exposure to light is increasing or decreasing. Natural lighting
conditions in spring stimulate sperm production, and conditions in autumn
depress production. 
Sperm cells are carried to the outside of the rooster in a thick white
fluid called semen. Semen is carried from the testis to the cloaca by a
small tube called the vas deferens. Each vas deferens exits through a small
sexual organ called a papilla. 
Fertilization 
When a bird is laying eggs, and a few days prior, she is receptive to
mating. The male indicates his interest by courting behavior. If the female
is receptive, she will crouch. The male steps on her back, squats down so
that the vents can touch, and releases the semen. Sperm cells must then
migrate the whole length of the female reproductive tract to join with the
egg cell that is on the yolk. Fertilization must occur in the infundibulum.
As a result, the blastodisc on the yolk becomes a blastoderm. During the 24
or more hours that the egg is being formed by the hen, the embryo completes
several series of cell division. Instead of the one cell present at
fertilization, the developing embryo has 256 cells when the egg is laid.
Figure 1 shows the difference between the blastodisc of an infertile egg
and the blastoderm of a fertile egg. After the egg cools to room
temperature, development of the embryo stops.
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E poi aggiungo una chicca trovata sul web (la riaggiusto un po'):
Q) What does a rooster's penis look like and rooster testicle size.
A) Beyond the obvious answer - small - why do you care? I can think of no
valuable purpose this information serves. Plus, its not the size that
counts.
E il mitico commento con relativa ri-risposta:
Q) Really though, what does a rooster's penis look like? I mean, if you
bought a rooster, and pinned it down spread eagle...er...rooster...what
exactly would you see? 
A) most likely...feathers. and a very, very angry rooster.
Quando ho letto "very, very angry rooster" sono morto dalle risate.
Sebastiano