Romero Martínez, Nicole
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Publication Restricted Días en alimentación para alcanzar el peso al sacrificio en corderos enteros y castrados alimentados con raciones totales y su efecto sobre parámetros productivos, rendimiento de la canal y cortes y nutrientes de la carne(2023-12-11) Romero Martínez, Nicole; Rodríguez Carías, Abner A.; College of Arts and Sciences - Sciences; Rivera Serrano, Aixa; Fernández Van Cleve, John A.; Department of Animal Science; Velázquez Augusto, WesleyThe days on feed (DOF) to reach slaughter weight in 12 intact lambs (IL) and 24 castrated lambs (CL) fed with total rations were evaluated and their effect on dry matter intake (DMI), total weight gain (TWG) and daily weight gain (DWG), feed conversion (FC), carcass and cuts yield, meat nutrients and physiological parameters associated with heat stress were assessed. DMI and FC data were analyzed over time using a completely randomized design with 2 treatments (DOF for each type of lamb) and 3 repetitions using the cage as the experimental unit. For TWG, DWG, physiological parameters associated with heat stress, carcass and cuts yield, meat nutrient content and fatty acid profile, a CRD with 2 treatments and the lamb as the experimental unit was used. The DMI of the CL and IL was equivalent to 3.9% of their live weight on a dry basis. The CL reached their slaughter weight of 40 to 45 kg in 117 days of the feeding period, while in IL it was 93 days. The DWG and FC of the CL and IL fed with the total ration were 140 g and 8.60 and 207 g and 6.57, respectively. The hot and cold carcass yields (HCY and CCY) were higher (P<0.05) in CL than in IL. No differences were observed between lambs in the weight of the evaluated cuts, nor in their yield in relation to the weight of the cold carcass. The content of total fatty acids in the meat was higher in IL than in CL, but of saturated fatty acids and palmitic acid was higher (P<0.05). Tympanic temperature, heart rate and respiratory rate were higher (P<0.05) in CL than in IL. In conclusion, the productive performance of IL fed in confinement with TR was better than in CL. The HCY was higher in CL than in IL, but the weight of the wholesale cuts and their yield was similar. The content of saturated fatty acids was higher in the meat of castrated lambs than in intact ones. Under the conditions of this experiment, castrated lambs are more susceptible to heat stress than intact ones.