Effects of mineral or protein-energy supplementation and genetic group on metabolism parameters of young beef bulls grazing tropical grass during the rainy season

Autor: T.A. Simioni, J.D. Messana, L.G. Silva, Y.T. Granja-Salcedo, J.A. Torrecilhas, E. San Vito, J.F. Lage, R.A. Reis, T.T. Berchielli
Přispěvatelé: Universidade Estadual Paulista (UNESP), AGROSAVIA, ICAA – Instituto de Ciências Agrarias e Ambientais, Campinas, Instituto Nacional de Ciência e Tecnologia/Ciência Animal, Conselho Nacional de Desenvolvimento Científico e Tecnológico
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Scopus
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Popis: Made available in DSpace on 2022-05-01T11:54:28Z (GMT). No. of bitstreams: 0 Previous issue date: 2022-01-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) The objective of this study was to evaluate the effects of mineral or protein-energy supplementation and animal genetic groups on rumen fermentation, digestibility and microorganisms of young beef bulls grazing tropical grass during the rainy season. Twelve (nn = 4 per genetic group) ruminally cannulated beef bulls [16 ± 2-months-old and 411 ± 34 kg initial body weight (BW)] were used in a cross-over design, with 4 periods, in a 2 × 3 factorial arrangement. Factors included: 1) two supplementation strategies (SS; mineral supplement [30 g/100 kg BW per day] and protein-energy supplement [300 g/100 kg BW per day]); and 2) three genetic groups (GG; Nellore [NL], ½Angus½Nellore [AN] and Senepol [SN]). Animals were continuously allocated in twelve paddocks composed of Urochloa brizantha (A. Rich.) Stapf. cv. Xaraés for 126 days during the rainy season. Supplementing animals of all GG with protein-energy supplement resulted in an increase of the intake of DM, OM, CP, EE, NFC and ME, and apparent total-tract digestibility of CP and EE. Additionally, animals fed protein-energy supplement showed highest rumen NH3–N concentration, microbial-N synthesis, and retained-N. However, a decrease in rumen pH and acetate:propionate ratio was observed when animals were fed protein-energy supplement. Except for Ruminococcus flavefaciens, the relative abundance of total Archaea and Prevotella.spp. were increased when animals where fed protein-energy supplement. Moreover, a GG effect was observed on the relative abundance of total Archaea, Prevotella.spp. and Ruminococcus flavefaciens, which were highest in NL, SN and AN animals, respectively. SN animals fed protein-energy supplement showed an increase of Streptococcus bovis and Selenomonas ruminantium relative abundance, while Fibrobacter succinogenes and Ruminococcus albus were highest in NL animals supplement mineral and protein-energy supplement, respectively. In conclusion, protein-energy supplementation to beef bulls grazing high-quality tropical grass is an effective strategy to increase rumen fermentation during the rainy season. In addition, it modulated rumen microorganism leading to an increase in the relative abundance of Prevotella.spp., Streptococcus bovis and Selenomonas ruminatium, and a decrease in acetate:propionate ratio in Senepol animals. Department of Animal Science School of Agricultural and Veterinarian Sciences São Paulo State University (UNESP) Corporación Colombiana de investigación Agropecuaria AGROSAVIA ICAA – Instituto de Ciências Agrarias e Ambientais Trouw Nutrition Campinas Instituto Nacional de Ciência e Tecnologia/Ciência Animal Conselho Nacional de Desenvolvimento Científico e Tecnológico Department of Animal Science School of Agricultural and Veterinarian Sciences São Paulo State University (UNESP) FAPESP: 2015/01147–0
Databáze: OpenAIRE
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