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Introduction
Animal husbandry means changing animal genes and feed to produce more meat, hide,
power per animal.
To 1790
Countless, anonymous people since antiquity selectively bred domesticated animals to
produce more meat, hides, fur, milk, and power. They also experimented with better
kinds of animal feed and medicines that produced healthier animals that lived longer.
1790-1799
1800-1809
1810-1819
1820-1829
1830-1839
1840-1849
1850-1859
1860-1869
1870-1879
1880-1889
1890-1899
1900-1909
1910-1919
1920-1929
1930-1939
1940-1949
1950-1959
1960-1969
In the 1960s and 70s, Dr. Morris cover of the U. of Delaware collected a team of scientists, Dr.
William Bentor, Dr. William Krauss and Dr. Lester Greene that lead to the diagnosis and
control of chicken diseases, such as leukosis, laryngotracheitis, coccidiosis and other avian
diseases.
Williams 78
1970-1979
1980-1989
1990-1999
Seventy years of scientific chicken broiler breeding results in 1993 broilers that were
ready for processing in 6.5 weeks, weighed in live at 4.4 pounds and had a feed conversion
rate (pounds of food per pound of meat) of 1.9. This compares with 1923 of
16 weeks, 2.2 pounds and 4.7. Chicken mortality dropped from 20% to 4% in the
same period because of (1) healthier diet, (2) improved hygienic living conditions, and (3)
invention of avian medicines.
Williams 73
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