Resumen

SIMON, L; LOPEZ, O  y  ALVAREZ, D. Evaluation of double purpose Holstein x Zebu cows in grazing systems with trees: II. Biparous. Pastos y Forrajes [online]. 2010, vol.33, n.2, pp.1-1. ISSN 0864-0394.

In order to evaluate the productive and reproductive performance of biparous double-purpose Holstein x Zebu cows, 75 cows were used in a completely randomized design, 25 per group, from genotypes Siboney (5/8 Holstein x 3/8 Zebu), Mambí (3/4 H x ¼ Z) and crossbred Siboney (5/8 H x 3/8 Z), which integrated a common herd with access to the same management and feeding, in a production dairy unit of the Supervaca farm, Genetic Livestock Production Firm of Matanzas. The stocking rate was 1,6 animals/ha and they rotated in 28 paddocks. Pasture availability and daily offer of forages and supplements were monthly measured. The body condition was estimated at the beginning and end of each season, milk production per cow was fortnightly measured, and the duration and production per lactation and the reproduction indicators were determined. The best body condition (3,97) favored crossbred Siboney (P<0,01); while no significant differences were found in the duration and production of milk per lactation. Likewise, crossbred Siboney was significantly higher (P<0,01) in the reproductive indicators parturition-first insemination (51,9), parturition-pregnancy (81) and parturition-parturition (363 days). The crossbred Siboney genotype was concluded to have the best performance in body condition and reproductive indicators, excelling Siboney and Mambí under the same management and feeding conditions, which shows higher adaptation to tropical grazing conditions

Palabras clave : Genotypes; performance; silvopastoral systems.

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