Download Australia - South Coast of NSW Holiday Planner PDF

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Sample text

During these first days the albumen, initially surrounding the yolk, loses water rapidly, becomes more viscid and heavy and settles gradually towards the small end of the egg, a process which can be seen in Appendix 2, on days 2, 3 and 4. By the end of the third day the embryo is completely surrounded by the 20 GENERAL DEVELOPMENT amnion and fluid begins to accumulate within the amniotic cavity (compare Appendix 2, days 4B and 5B). The amnion in its turn is surrounded by the chorion, almost concentric with it (Fig.

Generally one side of the amnion contracts and a balloon expands over the other side, but sometimes two such balloons may appear simultaneously. When the balloon in one region contracts and collapses the contraction wave passes to the opposite region, where a new balloon is formed. These amniotic contractions and expansions compress the yolk sac which, now become flabby and elastic as its contents are absorbed, rebounds when the expansions come to an end. Between active amniotic movements, and passive recoil of the yolk the embryo is thrown into a 25 DEVELOPMENT OF THE AVIAN EMBRYO 'swinging' movement which becomes quite violent at the time when amnion contractions are at their height on the tenth day.

During the first few days the embryo is small and light and floats on the yolk. On the second day the head region begins to bend at the level of the midbrain from its original straight axis (the cranial flexure). At about the same time the head begins to be turned to the left and this turning continues in a tailward direction until, by about 96 h of incubation, the embryo lies on its left side (the half-way stage can be seen in Appendix 2, day 3). Meanwhile a second (cervical) flexure appears at about the junction of the head and trunk (Appendix 2, day 3) so that the head now forms a rightangle with the trunk.

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