Introduction to breeding in crossbred dual purpose heifers
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.
| Main Authors: | , , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Asociacion Latinoamericana de Produccion Animal
2006
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| Online Access: | https://ojs.alpa.uy/index.php/ojs_files/article/view/321 |
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| Summary: | 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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