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Production costs and net margins for straightbred and crossbred holstein herds in Venezuela. Economic return from us holstein artificial insemination sires in holstein herds in Colombia, Mexico, and Venezuela. Comparative economic returns from artificial insemination and natural service in straightbred and crossbred holstein herdes in Venezuela. Net margins predicted from diferent fraction of holstein genes in and upgrading program for venezuela. Conclusions and recommendations. Recommendation. Research needs. References. Appendix 1. Survey A (English and spanish). Appendix 2. Survey B (English and spanish). Appendix 3. Survey C (English and spanish). Appendix 4. Farm and herd, production, and economic characteristics by breed group and ecozone. Appendix 5. Average herd-year standard deviations for nature equivalente milk and percentages of herd-years within herd-year mature equivalent milk mean classes for straightbred holsteins in Colombia, Mexico, Puerto Rico, and Venezuela and for crossbred holsteins in Venezuela. Appendix 6. Net present value (PVS) sire summaries fo US holstein artificial insemination sires available in Colombia, Mexico, and Venezuela in early 1987 for daughter milk response to sire selection of .30 in Colombia and Venezuela and .55 in Mexico with a conception rate of 50% and real interest rate of 7%. Appendix 7. Response from respondent groups to rank multiple trait performance in an upgrading program form a zebu breed to holstein.