Introduction to breeding in crossbred dual purpose heifers

  • Carlos Gonzalez-Stagnaro Universidad del Zulia, Facultad de Agronomía. Maracaibo, Venezuela.
  • Javier Goicochea Llaque Universidad del Zulia, Facultad de Ciencias Veterinarias. Maracaibo, Venezuela
  • María Alejandra Rodríguez-Urbina Postgrado de Producción Animal, Facultad de Agronomía, Universidad del Zulia.
  • Ninoska Madrid Bury Universidad del Zulia, Facultad de Agronomía. Maracaibo-Venezuela
  • Decio González Villalobos Universidad del Zulia, Facultad de Ciencias Veterinarias. Maracaibo, Venezuela

Abstract

This study evaluated 21,667 observations of age (EI) and weight (PI) of introduction to service in heifers from 47 dual-purpose bovine herds, located in four areas of dry and humid tropical forest environments. Effects studied were those of geographic area (Laberinto, Perija, Costa Oriental and Sur del Lago); management system: traditional (ST) and improved (SM); breed predominance (Holstein, Brown Swiss, Brahman and Carora); season of birth and of introduction to service; birth weight (PN); and weaning age (ED) and weight (PD). Mean EI was 30.9 ± 5.9 m and was earlier (P < 0.001) in Laberinto and Perija than in the other regions, in SM than ST (27.3 ± 02 vs.31.6 ± 0.01 m), and in Brown Swiss and Brahman than in Holsteins (32.0 ± 01 m). Mean PI was 353.3 ± 31.9 kg and was heavier (P<0.001) in Laberinto to (383.4 ± 1.5 kg), in SM than ST (364.6± 1.0 vs. 349.7 ± 0.5 kg), and Holstein and Brown Swiss (354.3 ± 0.7 and 357.6 ± 1.2 kg). EI was related to PI and dependent on daily weight gain (GDP); 48% of the heifers had GDP of 251 to 350 g/d an only 9.2% gained > 350 g/d. A GDP of > 350 g/d resulted in the earliest EI (24.4 ± 0.4 m) and the heaviest PI (375.8 ± 1.8 kg). Birth and weaning in dry season delayed EI. Lower EI and higher PI during rainy season were related to grazing conditions. At ED of < 10 m or > 10 m, EI increased (29.2 ± 0.4 to 34.6 ± 0.4 m) and PI decreased (366.2 ± 2.0 to 358.6 ± 2.0 kg); while in heifers with PD < 180 and > 180 kg, EI was 29.9 ± 0.2 and 27.8 ± 0.2 m, and PI was 353.5 ± 0.9 and 359.1 ± 1.1 kg (P<0.001). Adequate feeding management improved EI and PI results.

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Author Biographies

Carlos Gonzalez-Stagnaro, Universidad del Zulia, Facultad de Agronomía. Maracaibo, Venezuela.
MV Universidad Nacional Mayor de San Marcos, Lima-Perú, DEA Université des Sc et Tech. du Languedoc, Montpellier, Dr Vet Universidad Complutense de Madrid, España.
Javier Goicochea Llaque, Universidad del Zulia, Facultad de Ciencias Veterinarias. Maracaibo, Venezuela
MV Universidad Nacional Mayor de San Marcos, LIma-Peru. Especialista en Reproducción: Veterinary Faculty, Royal University, Stokolm, Sweden
María Alejandra Rodríguez-Urbina, Postgrado de Producción Animal, Facultad de Agronomía, Universidad del Zulia.
MV, Universidad Centro Occidental "Lisandro Alvarado", Barquisimeto-Venezuela. M Sc Producción Animal, Facultad de Agronomía, Universidad del Zulia. Maracaibo-Venezuela.
Ninoska Madrid Bury, Universidad del Zulia, Facultad de Agronomía. Maracaibo-Venezuela
M.V., Universidad del Zulia, Venezuela; M Sc. University of Illinois-Urbana, USA, D. Sc Vet Universidad Complutense de Madrid, España. Profesora de la Facultad de Agronomía, Universidad del Zulia, Maracaibo, Venezuela
Decio González Villalobos, Universidad del Zulia, Facultad de Ciencias Veterinarias. Maracaibo, Venezuela
MV Universidad del Zulia, Maracaibo-Venezuela, Mg Sc Produccón Animal, Facultad de Agronomía, Universidad del Zulia. Maracaibo-Venezuela
Published
2006-03-29
How to Cite
Gonzalez-Stagnaro, Carlos, Javier Goicochea Llaque, María Alejandra Rodríguez-Urbina, Ninoska Madrid Bury, and Decio González Villalobos. 2006. “Introduction to Breeding in Crossbred Dual Purpose Heifers”. Latin American Archives of Animal Production 14 (1). https://ojs.alpa.uy/index.php/ojs_files/article/view/321.
Section
Original paper