Resumen

LOPEZ-LEYVA, Yoel; ARECE-GARCIA, Javier; TORRES-HERNANDEZ, Glafiro  y  GONZALEZ-GARDUNO, Roberto. Effect of the number of parturitions on the productive performance of Pelibuey and crossbred Pelibuey ewes under production conditions. Pastos y Forrajes [online]. 2017, vol.40, n.1, pp.73-77. ISSN 0864-0394.

In order to evaluate the effect of the number of parturitions on the weight at birth of the lambs and on the parturition-pregnancy interval of Pelibuey (PBE) and crossbred Pelibuey ewes (CPB), under production conditions, a retrospective study was conducted of the Genetic Center of Pelibuey Sheep belonging to the Livestock Production Enterprise Matanzas, Cuba. The animals grazed in 3 ha of natural pastures and were supplemented with king grass forage, sugarcane, grass hay, commercial concentrate feed, mineral salts, as well as corn distillery residues (Northgold) according to the availability of this feedstuff. There were significant differences (p< 0,05) in favor of the live weight at birth in the lambs (2,77 vs. 2,69 kg for PBE and CPB, respectively). In turn, significant differences (p < 0,05) were found in the weight in favor of male lambs, with the highest values in PBE (2,83 vs. 2,72 kg, for PBE and CPB, respectively). The weight at birth of the lambs in PBE and CPB differed (p < 0,05) with regards to the number of parturitions and it was higher in PBE; the best values were obtained from the second parturition in PBE (3,01 kg) and in the fourth parturition in CPB (2,93 kg). The increase of the number of parturitions in the ewes affected (p < 0,05) the parturition-pregnancy interval in PBE and CPB. It is concluded that the number of parturitions in Pelibuey and crossbred Pelibuey ewes under commercial production conditions had a marked effect on the weight at birth of the lambs and on the parturition-pregnancy interval, with the best results from the second parturition; in turn, the weight at birth of the lambs was affected by the breed.

Palabras clave : sheep; weight at birth; breeds.

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