Livestock production has seen dramatic changes ___ the post-war years. Dairy farming is a good example to illustrate the nature ____ these changes. Between 1960 and 1980 the milk yields of cows increased ___ about 50%. A high-yielding cow can produce 40 liters ____milk in 24 hours. Many factors have led to higher yields and great efficiency ______ dairy farms.
The intensive methods used to rear pigs and poultry are so different …_____traditional farming practices. ______ both poultry and pig units, temperature, light and amounts of feed are automatically controlled