Carcass and Meat Characteristics of Cull Heifers from Different Genetic Groups Fed Diets with Different Sources of Nonprotein Nitrogen in Confinement.

Autor: Paranhos da Silva MG; College of Veterinary Medicine and Animal Science, Federal University of Mato Grosso do Sul, Avenida Senador Filinto Muler, 2443, Pioneiros, Campo Grande 79070-900, MS, Brazil., Ítavo LCV; College of Veterinary Medicine and Animal Science, Federal University of Mato Grosso do Sul, Avenida Senador Filinto Muler, 2443, Pioneiros, Campo Grande 79070-900, MS, Brazil., Ítavo CCBF; College of Veterinary Medicine and Animal Science, Federal University of Mato Grosso do Sul, Avenida Senador Filinto Muler, 2443, Pioneiros, Campo Grande 79070-900, MS, Brazil., Bonin Gomes MN; College of Veterinary Medicine and Animal Science, Federal University of Mato Grosso do Sul, Avenida Senador Filinto Muler, 2443, Pioneiros, Campo Grande 79070-900, MS, Brazil., Arcanjo AHM; Agricultural Research Company of Minas Gerais, EPAMIG Oeste, Rua Afonso Rato, 1301, EPAMIG Oeste, Uberaba 38060-040, MG, Brazil., Moura JRF; College of Veterinary Medicine and Animal Science, Federal University of Mato Grosso do Sul, Avenida Senador Filinto Muler, 2443, Pioneiros, Campo Grande 79070-900, MS, Brazil., Lopes BFDCL; College of Veterinary Medicine and Animal Science, Federal University of Mato Grosso do Sul, Avenida Senador Filinto Muler, 2443, Pioneiros, Campo Grande 79070-900, MS, Brazil., Nonato LM; College of Veterinary Medicine and Animal Science, Federal University of Mato Grosso do Sul, Avenida Senador Filinto Muler, 2443, Pioneiros, Campo Grande 79070-900, MS, Brazil., Gomes RDC; Brazilian Agricultural Research Corporation, Embrapa Beef Cattle, Avenida Rádio Maia, 830, Vila Popular, Campo Grande 79106-550, MS, Brazil.
Jazyk: angličtina
Zdroj: Animals : an open access journal from MDPI [Animals (Basel)] 2024 Aug 08; Vol. 14 (16). Date of Electronic Publication: 2024 Aug 08.
DOI: 10.3390/ani14162304
Abstrakt: The aim of this study was to evaluate the effect of genetic groups and diets with different sources of nonprotein nitrogen (NPN) on the carcass and meat characteristics of beef heifers. The meat from 40 heifers (20 ½ Angus ½ Nellore (A × N) and 20 ½ Charolais ½ Nellore (L × N)), finished in feedlots, was used. The heifers were fed diets containing different sources of NPN-(1) a diet with livestock urea and protected urea (LPU) and (2) a diet with extruded urea (EU)-in a completely randomized design with a 2 × 2 factorial arrangement. Carcass, composition and meat quality evaluations were carried out. There were no significant interactions between diet and genetic group for most of the variables evaluated ( p > 0.05). The A × N heifers had higher hot carcass weights (305.73 vs. 279.80 kg), loin eye areas (80.87 vs. 75.45 cm 2 ), subcutaneous fat thicknesses (8.69 vs. 6.35 mm) and lower shear forces (6.98 vs. 7.7 kg) compared to the C × N heifers ( p < 0.05). The meat from the A × N heifers had higher proportions of saturated fatty acids (49.41 vs. 47.95%), with no effects on the proportions of monounsaturated (47.57%) and polyunsaturated (4.01%) fatty acids. The A × N heifers had better carcass and meat characteristics, while the C × N heifers had meat and fat with better fatty acid profiles.
Databáze: MEDLINE
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