Comparison of Nellore and Bos taurus x Nellore beef crosses at the same age on performance, carcass characteristics, and fecal starch content

Autor(es)

Goulart, R. S. ^[1] ; Caetano, M. ^[2] ; Pott, E. B. ^[3] ; da Cruz, G. M. ^[3] ; Tullio, R. R. ^[3] ; de Alencar, M. M. ^[3] ; Bertho, R. D. M. ^[1] ; Lanna, D. P. D. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Coll Anim Sci & Food Engn, Dept Anim Sci, BR-13635900 Pirassununga, SP - Brazil

^[2] Univ Adelaide, Sch Anim & Vet Sci, Dept Anim & Vet Biosci, Roseworthy, SA 5371 - Australia

^[3] Embrapa Pecuaria Sudeste, CP 339, BR-13560970 Sao Carlos, SP - Brazil

^[4] Univ Sao Paulo, Luiz De Queiroz Coll Agr, Dept Anim Sci, BR-13418900 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: APPLIED ANIMAL SCIENCE; v. 36, n. 3, p. 430-436, JUN 2020.
• Citações Web of Science: 0

Resumo

Objective: Our objective was to evaluate the performance, carcass characteristics, and fecal starch content of castrated Nellore and Bos taurus x Nellore crossbred cattle raised on the same plane of nutrition from birth until slaughter. Materials and Methods: Forty-seven steers of similar age (22 mo +/- 23 d) and BW (310 +/- 30 kg) were divided into 4 genetic groups: 1/2 Angus + 1/2 Nellore (AN), 1/2 Canchim + 1/2 Nellore (CN), Nellore (NL), and 1/2 Simmental + 1/2 Nellore (SN). Diet contained 13.34% CP, 9.35% RDP, 18.18% of starch on DM, and 68.69% TDN. Results and Discussion: There was no difference in BW at the beginning of the feedlot period between AN and SN steers. However, AN were heavier than NL and CN. Groups AN and SN had the highest ADG (P < 0.0001), and AN had the highest DMI (kg/d and % of BW; P < 0.0001). The AN and SN steers had the highest initial-slaughter and final carcass weights. Group AN had higher fat thickness (P = 0.02) than the CN, NL, and SN groups but lower loin eye area. Group SN presented the lowest fecal starch content (P = 0.04), which suggests greater ability to use starch when compared with NL, AN, and CN groups. Implications and Applications: British Bos taurus x Nellore crosses allow for better performance and carcass finishing than purebred Nellore steers. Steers with a higher percentage of Zebu blood may have less ability to digest starch. (AU)

• Processo FAPESP: 04/04908-8 - Desempenho, composicao quimica e fisica, exigencias de energia, proteina e macro-minerais de diferentes grupos geneticos de novilhos em terminacao.
• Beneficiário: Rodrigo Silva Goulart
• Modalidade de apoio: Bolsas no Brasil - Mestrado