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

21,667 observations of age (IE) and weight (PI) at introduction to service were evaluated in heifers from 47 dual-purpose cattle herds, located in four areas: dry and humid tropical forest. The effects studied were: geographic area (Labyrinth, Perija, East Coast and South of the Lake); management system: traditional (ST) and improved (SM); breed predominance (Holstein, Brown-Swiss, Brahman and Carora); time of birth and introduction to service; birth weight (BW); and age at weaning (ED) and weight (PD). The mean SI was 30.9±5.9 m and was earlier (P<0.001) in Laberinto and Perija than in the other regions, in SM than in ST (27.3±02 vs. 31.6±0, 01 m), and in Brown Swiss and Brahman than in Holstein (32.0±01m). The mean PI was 353.3±31.9 kg and was heavier (P<0.001) in Labyrinth 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 kg). and 357.6±1.2 kg). IE was related to IP and depended on daily weight gain (GDP); 48% of the heifers had a GDP of 251 to 350 g/d and 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 the dry season with delayed IE. The lowest EI and the highest PI during the rainy season were related to grazing conditions. At ED from <10 m to >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 ); in heifers with PD <180 and >180 kg, the IE was 29.9±0.2 and 27.8±0.2 m, and the PI was 353.5±0.9 and 359.1±1, 1kg (P<0.001). Adequate feeding management improved IE 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”. Archivos Latinoamericanos De Producción Animal 14 (1). https://ojs.alpa.uy/index.php/ojs_files/article/view/321.
Section
Original paper