Hie influence of scare elements of tropical milk production systems on breeding objectives is discussed. Expansion of demand for milk and meat should be expected from increased population and income growth. Relative commercial value of milk fat may be strongly influenced by government policies regulating the proportion of liquid milk consumed. Calf production is an integral part of cow performance under the common practices of hand milking and suckling. Milk letdown may be an important trait for milking in modern dairy parlours. Experimental economic evaluations have referred mainly to comparisons of breeds and crosses, indicating that European x zebu crosses outperformed purebreds in the environments studied. An evaluation of milking time in relation to milk yield of crossbred groups is presented. Results from a simulation study on tick control strategies allowed evaluation of genetic change in tick resistance.

F. E Madalena

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume IX. Breeding programs for dairy and beef cattle, water buffalo, sheep, and goats., , 33–43, 1986
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