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Reproductive Rates and Growth of Purebred Brown Swiss Cattle in Brazil¹

Department of Animal Husbandry, Iowa State College, Ames

ABSTRACT

That cattle of breeds originating in Europe thrive less well in tropical climates than in the regions of their origin is widely believed. The aetual evidence is extensive enough to be convincing but is mostly from general observations or from experience of the "trial and error" kind, rather than from experiments designed expressly to test the questions involved. Printed descriptions of such pertinent vital statistics as reproductive and growth rates, mortalities, length of life, etc., for whole populations of cattle in tropical and subtropical regions are rare.

The present article summarizes from a study of Brazilian data on Brown Swiss cattle what seem to be the facts most interesting to North American readers. These cattle are commonfy called "Schwyz" or "Raa Suía Parda" in Brazil. The detailed evidence and topics which will be of interest mainly in Brazil are expected to be published there.

The literature on cattle breeding in the tropics has been reviewed by Howe (5) and Rathore (10).

¹ Journal Paper No. J-2477 of the Iowa Agricultural Experiment Station, Ames. Project No. 1053.

² Present address: Departmento da produão animal, Belo Horizonte, Minas Gerais, Brazil.