Application of longitudinal data analysis allows to detect differences in pre-breeding growing curves of 24-month calving Angus heifers under two pasture-based systems with differential puberty onset
Background Longitudinal data analysis contributes to detect differences in the growing curve by exploiting all the information involved in repeated measurements, allowing to distinguish changes over time within individuals, from differences in the baseline levels among groups. In this research, long...
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| Autores principales: | , , , , , |
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| Formato: | Articulo Preprint |
| Lenguaje: | Inglés |
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2020
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/124313 |
| Aporte de: |
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I19-R120-10915-124313 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Veterinarias Grazing Longitudinal data Growth Heifer Puberty Rearing |
| spellingShingle |
Ciencias Veterinarias Grazing Longitudinal data Growth Heifer Puberty Rearing Bonamy, Martín Iraola, Julieta Josefina de Prando, Alberto José Baldo, Andrés Giovambattista, Guillermo Rogberg Muñoz, Andrés Application of longitudinal data analysis allows to detect differences in pre-breeding growing curves of 24-month calving Angus heifers under two pasture-based systems with differential puberty onset |
| topic_facet |
Ciencias Veterinarias Grazing Longitudinal data Growth Heifer Puberty Rearing |
| description |
Background Longitudinal data analysis contributes to detect differences in the growing curve by exploiting all the information involved in repeated measurements, allowing to distinguish changes over time within individuals, from differences in the baseline levels among groups. In this research, longitudinal and cross-sectional analysis were compared to evaluate differences in growth in Angus heifers under two different grazing conditions, ad libitum (AG) and controlled (CG) to gain 0.5 kg day-1 .
Result Longitudinal mixed models show differences in growing curve parameters between grazing conditions, that were not detected by cross-sectional analysis. Differences (P < 0.05) in first derivative of growth curves (daily gain) until 289 days were observed between treatments, AG being higher than CG. Correspondingly, pubertal heifer proportion was also higher in AG at the end of rearing (AG, 0.94; CG, 0.67).
Conclusion In longitudinal studies, the power to detect differences between groups increases by exploiting the whole information of repeated measures, modelling the relation between measurements performed on the same individual. Under a proper analysis, valid conclusion can be drawn with fewer animals in the trial, improving animal welfare and reducing investigation costs. |
| format |
Articulo Preprint |
| author |
Bonamy, Martín Iraola, Julieta Josefina de Prando, Alberto José Baldo, Andrés Giovambattista, Guillermo Rogberg Muñoz, Andrés |
| author_facet |
Bonamy, Martín Iraola, Julieta Josefina de Prando, Alberto José Baldo, Andrés Giovambattista, Guillermo Rogberg Muñoz, Andrés |
| author_sort |
Bonamy, Martín |
| title |
Application of longitudinal data analysis allows to detect differences in pre-breeding growing curves of 24-month calving Angus heifers under two pasture-based systems with differential puberty onset |
| title_short |
Application of longitudinal data analysis allows to detect differences in pre-breeding growing curves of 24-month calving Angus heifers under two pasture-based systems with differential puberty onset |
| title_full |
Application of longitudinal data analysis allows to detect differences in pre-breeding growing curves of 24-month calving Angus heifers under two pasture-based systems with differential puberty onset |
| title_fullStr |
Application of longitudinal data analysis allows to detect differences in pre-breeding growing curves of 24-month calving Angus heifers under two pasture-based systems with differential puberty onset |
| title_full_unstemmed |
Application of longitudinal data analysis allows to detect differences in pre-breeding growing curves of 24-month calving Angus heifers under two pasture-based systems with differential puberty onset |
| title_sort |
application of longitudinal data analysis allows to detect differences in pre-breeding growing curves of 24-month calving angus heifers under two pasture-based systems with differential puberty onset |
| publishDate |
2020 |
| url |
http://sedici.unlp.edu.ar/handle/10915/124313 |
| work_keys_str_mv |
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Repositorios |
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1764820450096971777 |