Food restriction in young calves and genital development
With the objective of evaluating the effect of the rate of body weight (BW) gain, assay was performed with 45 calves in feedlot during the first winter and summer grazing, on the body and genital development at 18 months, randomly distributed in three treatments: feed ad libitum, 15% and 30% of qu...
Guardado en:
| Autores principales: | , |
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| Formato: | Documento de conferencia |
| Lenguaje: | Inglés |
| Publicado: |
Sociedade Brasileira de Zootecnia
2020
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| Materias: | |
| Acceso en línea: | http://repositorio.unne.edu.ar/handle/123456789/27519 |
| Aporte de: |
| Sumario: | With the objective of evaluating the effect of the rate of body weight (BW) gain, assay was performed
with 45 calves in feedlot during the first winter and summer grazing, on the body and genital development at 18
months, randomly distributed in three treatments: feed ad libitum, 15% and 30% of quantitative restriction. They
were fed a diet formulated to moderate gains, composed of expeller sunflower, corn grain, whole plant silage
sorghum, mineral core and monensin, providing 3% of BW for the ad libitum treatment. The calves were weighed
monthly and determined the rump height and thoracic perimeter. The results obtained for ad libitum treatment:
rump height 116.6 and 131.3 cm; thoracic perimeter 153.3 and 158.6 cm; BW 290 and 301 kg; genital score 2.8 and
3.2, end of feedlot and summer grazing, respectively. The rearing during the first winter with BW gain between
0.75 and 0.60 kg day-1 (ad libitum and 15% restriction, respectively) similarly produces body and genital
development of heifers retained as future bellies, reduce the costs of feeding the 15% restriction diet. The restriction
of 30% (body weight gains of 0.37 kg day-1) affects the development of females, possibly compromising their
future as breeders. It is estimated that the BW obtained for ad libitum and 15% restriction at the end of the grazing
phase will achieve the minimum required for the first service in autumn, at 18 months old heifers. |
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