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In vivo embryo production (embryo transfer) is an alternative for F1 dairy herds formation and maintenance. The aim of this study was to evaluate the potential of utilization of grazing and supplemented Holstein heifers as embryo donors in summer or winter. Superovulation was performed in seven heifers on each season. Climatic parameters, as well as rectal temperature and respiratory rate of donors were measured. Temperature and humidity index (THI) was higher (p 0.05). Holstein heifers can be used as embryo donors in both summer and winter, under the given conditions.

Desempenho de novilhas Holandês na produção de embriões F1 Holandês-Zebu, em condições tropicais