By N. T. M. Yeates
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Additional resources for Animal Science. Reproduction, Climate, Meat, Wool
Ovaries out of reach; outline of foetus m a y be felt. 5 months F o e t u s the size of a terrier; rests o n floor of a b d o m e n ; individual parts (limbs), 6 months also c o t y l e d o n s , m a y be felt. G r o w t h of foetus increasingly pushes uterus and cervix posteriorly into pelvic After cavity. 7 months paraffin or some other suitable material, are carefully introduced into the rectum to beyond the anterior rim of the pelvis. The hand is then opened, the palm directed downwards and the uterus explored (see Figure 5 .
After penetrating the zona pellucida, the spermatozoon becomes attached to the vitelline membrane, and is then believed to be slowly engulfed by the cytoplasm of the egg. At the same time the egg changes in such a way that its membranes are no longer penetrable by other spermatozoa (Austin and Bishop, 1 9 5 7 ) . Once engulfed into the egg cytoplasm, the sperm's head and tail separate. The head, containing the male nuclear elements, moves towards the female counterpart in the centre of the egg.
G r o w t h of foetus increasingly pushes uterus and cervix posteriorly into pelvic After cavity. 7 months paraffin or some other suitable material, are carefully introduced into the rectum to beyond the anterior rim of the pelvis. The hand is then opened, the palm directed downwards and the uterus explored (see Figure 5 . 9 ) . Familiarity with the feel of the normal, non-pregnant uterus is a first requirement, in order that comparisons may be made with it. The non-pregnant uterus is small, symmetrical, and firm to the touch.