PSXII-10 Post-weaning energy balance in dual-purpose replacement heifers (Giroland-Brown Swiss cross) confined-raised and grazing-raised before and after rainy season in tropical systems livestock

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AudienciaPúblico en generales_ES
CoberturaMéxicoes_ES
Fecha de ingreso2026-09-15T00:30:24Z
Fecha de publicación2024-01-01
ResumenAbstract Common management of dual-purpose (Giroland-Brown Swiss cross) cattle in the Mexican Tropical region is to rear heifer replacement post-weaning in group pens. It is assumed that placing post-weaning heifers in group pens has more access to higher energy reserves due to the reduced foraging behavior. This study compared β-hydroxy-butyrate (BHB), body condition score (BCS), and average daily gain (ADG) in the post-weaning barn-raised and grazing-raised calves. Giroland-Brown Swiss cross (n = 8) were divided into 2 groups: confined-group (CG; n = 4) and grazing-group (GG; n = 4) for 4 mo (June to September). Both groups had ad libitum access to the same pasture (star grass; Cynodon plectostachyus) containing 6.5 % and 12.4 % crude protein (CP) during 2 regional seasons (drought and rainy season). Commercial concentrate was offered daily (0.5 kg; 17.5 % CP and 1 881 Mcal/kg net energy) at 1000 h. CG bunk feeders were refilled with pasture when empty during the day and mineral salts and water were provided at libitum to both groups. BHB was estimated monthly using a test strip (Freestyle Optium Neo, Witney UK). Additionally, BCS and ADG were estimated twice per month. An analysis of variance (ANOVA) model with a factorial design was implemented to assess BHB, BCS, and ADG as dependent variables and group treatment (GG and CG), month (4 levels), and season (drought and rainy) as independent variables. BHB values were not significant in the 2 treatment groups (GG: 300 ± 40 and CG: 230 ± 20 µmol/L; P > 0.05). The ADG (LS Means ± SEM) did not differ between treatment groups during drought season (GG: 419 ± 115 g compared with CG 310 ± 15 g; P > 0.05). Nevertheless, the ADG was significantly different between treatment groups during the rainy season (GG 790 ± 131 g compared with CG - 110 ± 63 g; P < 0.05). In addition, BCS was significantly different at the end of the experiment among treatment groups (GG: 3.13 ± 0.22 compared with CG: 2.6 ± 0.19). Our conclusion is that both management (grazing and confined) were equal to rear calves after weaning during the drought season. However, grazing the calves performed better (> ADG, and BCS) than confined management during the rainy season.es_ES
Doihttps://doi.org/10.1093/jas/skae234.822es_ES
URIhttps://riuat.uat.edu.mx/handle/123456789/2339
Idiomaeses_ES
EditorialOxford University Press (OUP)es_ES
RelaciónJournal of Animal Sciencees_ES
URL relacionadohttps://doi.org/10.1093/jas/skae234.822es_ES
DerechosAcceso abierto (Metadatos de producción científica)es_ES
Licenciahttp://purl.org/coar/access_right/c_abf2es_ES
FuenteJournal of Animal Science
TítuloPSXII-10 Post-weaning energy balance in dual-purpose replacement heifers (Giroland-Brown Swiss cross) confined-raised and grazing-raised before and after rainy season in tropical systems livestockes_ES
TipoArtículoes_ES
ArbitradoHa sido Arbitradoes_ES
AutorMarquez, Hector Javier Perez
AutorAviles-Ruiz, Ricardo
AutorBravo, Oscar Barron
AutorRuiz-Albarran, Miguel
AutorFlores-Najera, Manuel
AutorMarquez, Hector Javier Perezes_ES
AutorAviles-Ruiz, Ricardoes_ES
AutorBravo, Oscar Barrones_ES
AutorRuiz-Albarran, Migueles_ES
AutorFlores-Najera, Manueles_ES
InstituciónUniversidad Autónoma de Tamaulipas
InstituciónUniversidad Autónoma de Tamaulipases_ES
NúmeroSupplement_3es_ES
Rango de páginas730-731es_ES
URL relacionadahttps://doi.org/10.1093/jas/skae234.822
Tipo de artículoIndexado
Tipo de artículoIndexadoes_ES
Volumen102es_ES

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