HAS NO TITLE.

Abstract

The study was carried out at Gualaca Research Station with Zebu cattle grazing on unfertilized Faragua (hyparrhenia rufa) grass, with no mineral salt suplemented. Two mating periods of 3 months each during the year were studied; the first from April 15 to July 15, the second from August 15 to November 15. The same were repeated for 8 and 6 years respectively. Hards were made up of calving and noncalving cows, and heifers ready for service. The cow bult relation was 26:1. Results showed that under the first mating period, there was a greater percentage (57.2%) of pregnant cows than that of the second period (42.9%).