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...

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Autores principales: Yáñez, Enrique Alejandro, Rouvier, Matías Alejandro
Formato: Documento de conferencia
Lenguaje:Inglés
Publicado: Sociedade Brasileira de Zootecnia 2020
Materias:
Growth
Winter
Genital score
Heifers
Crescimento
Inverno
Novilhas
Score genital
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/27519
Aporte de:
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
id I48-R184-123456789-27519
record_format dspace
spelling I48-R184-123456789-275192024-10-23T10:54:16Z Food restriction in young calves and genital development Yáñez, Enrique Alejandro Rouvier, Matías Alejandro Growth Winter Genital score Heifers Crescimento Inverno Novilhas Score genital 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. O objetivo do trabalho foi determinar o efeito de diferentes ganhos de PV de bezerras confinadas no primeiro inverno post-desmama, com recria estival pastoril, sobre o crescimento, desenvolvimento corporal e score genital (SG) em novilhas aos 18 meses de idade. Utilizaram-se 45 bezerras Brangus alojadas em 3 currais, com os tratamentos: à vontade (T1), 15% de restrição (T2), 30% de restrição (T3). A dieta, composta por expeller de girassol, milho em grão, silagem de planta inteira de sorgo e mistura mineral com ionóforo, foi formulada para ganho moderado, oferecendo 3% do PV em MS para o T1. As variáveis avaliadas foram altura à garupa, perímetro torácico, PV e SG. Para T1 os resultados obtidos foram altura à garupa 116,6 e 131,3 cm; perímetro torácico 153,3 y 158,6 cm; PV de 290 y 301,2 kg; SG de 2,80 y 3,23, para o fim do período de confinamento e fim do período em pastejo, respectivamente. Ganhos de PV entre 0,75 y 0,60 kg dia-1 (T1 e T2, respectivamente) durante o primeiro inverno da recria, produz similar desenvolvimento corporal e genital em novilhas retidas como futuros ventres, reduzindo o custo da alimentação na dieta com 15% de restrição. A restrição de 30% com ganho de 0.370 kg dia -1, prejudica o desenvolvimento das fêmeas, possivelmente comprometendo seu futuro como reprodutoras. Estima-se que o PV obtido com T1 e T2 no final do período estival, permitirá atingir o PV mínimo requerido para a primeira monta no outono, aos 18 meses de idade das novilhas. 2020-09-24T02:30:46Z 2020-09-24T02:30:46Z 2015-07-19 Documento de conferencia Yáñez, Enrique Alejandro y Rouvier, Matías Alejandro, 2015. Food restriction in young calves and genital development. En: 52a Reunião Anual da Sociedade Brasileira de Zootecnia. Belo Horizonte: Sociedade Brasileira de Zootecnia, p. 1-3. http://repositorio.unne.edu.ar/handle/123456789/27519 eng openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf p. 1-3 application/pdf Sociedade Brasileira de Zootecnia
institution Universidad Nacional del Nordeste
institution_str I-48
repository_str R-184
collection RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE)
language Inglés
topic Growth
Winter
Genital score
Heifers
Crescimento
Inverno
Novilhas
Score genital
spellingShingle Growth
Winter
Genital score
Heifers
Crescimento
Inverno
Novilhas
Score genital
Yáñez, Enrique Alejandro
Rouvier, Matías Alejandro
Food restriction in young calves and genital development
topic_facet Growth
Winter
Genital score
Heifers
Crescimento
Inverno
Novilhas
Score genital
description 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.
format Documento de conferencia
author Yáñez, Enrique Alejandro
Rouvier, Matías Alejandro
author_facet Yáñez, Enrique Alejandro
Rouvier, Matías Alejandro
author_sort Yáñez, Enrique Alejandro
title Food restriction in young calves and genital development
title_short Food restriction in young calves and genital development
title_full Food restriction in young calves and genital development
title_fullStr Food restriction in young calves and genital development
title_full_unstemmed Food restriction in young calves and genital development
title_sort food restriction in young calves and genital development
publisher Sociedade Brasileira de Zootecnia
publishDate 2020
url http://repositorio.unne.edu.ar/handle/123456789/27519
work_keys_str_mv AT yanezenriquealejandro foodrestrictioninyoungcalvesandgenitaldevelopment
AT rouviermatiasalejandro foodrestrictioninyoungcalvesandgenitaldevelopment
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