478 



FOETAL DYSTOKIA. 



with respect to the mechanism, nature of the complication, nor measures 

 to be adopted. 



In hock presentation, the point of the os calcis is always the first part 

 the hand encounters in exploration ; but it may be found at various 



Fig. 133. 

 Hock Presentation : Calf. 



depths. Sometimes the hocks alone are in the canal, the body of 

 the foetus being still in the uterus ; while in other cases they and the 

 croup are within the inlet, and are wedged in the passage. 



Fig. 134. 

 Diagrams of the Hind-limbs in Hock Presentation. 



Indications. 



The difficulties vary according to circumstances. With the larger ani- 

 mals at their full period of pregnancy, birth cannot take place, as a rule, 

 until the deviation has been rectified ; and to attempt delivery before this 

 has been done is to expose the Cow or Mare — particularly the latter — to 

 great danger. With the Sheep, Goat, Sow, and Bitch, the foetus can be, 

 and often is, extracted in this malposition. 



The indication is, therefore, with the Mare or Cow, to give the hind- 



