Association of additives in supplemented grazing cattle during the finishing phase at the rainy season

Author(s):Show less -

Erick Escobar Dallantonia ^[1] ; Lorrayny Galoro da Silva ^[2] ; Yury Tatiana Granja-Salcedo ^[3] ; Juliana Duarte Messana ^[4] ; Liziane de Figueiredo Brito ^[5] ; Ana Rebeca Castro Lima ^[6] ; Elias San Vito ^[7] ; Pablo de Souza Castagnino ^[8] ; Américo Garcia da Silva Sobrinho ^[9] ; Ricardo Andrade Reis ; Telma Teresinha Berchielli

Affiliation:Show less -

^[1] Universidade Estadual Paulista “Júlio de Mesquita Filho”. Faculdade de Ciências Agrárias e Veterinárias. Departamento de Zootecnia - Brasil

^[2] Universidade Estadual Paulista “Júlio de Mesquita Filho”. Faculdade de Ciências Agrárias e Veterinárias. Departamento de Zootecnia - Brasil

^[3] Corporación Colombiana de Investigación Agropecuaria - Colômbia

^[4] Universidade Estadual Paulista “Júlio de Mesquita Filho”. Faculdade de Ciências Agrárias e Veterinárias. Departamento de Zootecnia - Brasil

^[5] Universidade Estadual Paulista “Júlio de Mesquita Filho”. Faculdade de Ciências Agrárias e Veterinárias. Departamento de Zootecnia - Brasil

^[6] Universidade Estadual Paulista “Júlio de Mesquita Filho”. Faculdade de Ciências Agrárias e Veterinárias. Departamento de Zootecnia - Brasil

^[7] Instituto de Ciências Agrárias e Ambientais - Brasil

^[8] Universidade Estadual Paulista “Júlio de Mesquita Filho”. Faculdade de Ciências Agrárias e Veterinárias. Departamento de Zootecnia - Brasil

^[9] Universidade Estadual Paulista “Júlio de Mesquita Filho”. Faculdade de Ciências Agrárias e Veterinárias. Departamento de Zootecnia - Brasil

• Document type: Journal article
• Source: REVISTA BRASILEIRA DE ZOOTECNIA-BRAZILIAN JOURNAL OF ANIMAL SCIENCE; v. 52, 2023-03-03.

Abstract

ABSTRACT The objectives were to evaluate the effects of monensin and virginiamycin, alone or combined, on supplemented Nellore cattle grazing tropical grass during the rainy season. Two experiments were conducted simultaneously to evaluate intake, digestibility, CH4 emissions, blood parameters, performance, and carcass characteristics (Exp. 1), and ruminal fermentation and relative abundance of ruminal microorganisms (Exp. 2). Animals (n = 92 Exp. 1 and n = 12 Exp. 2) were distributed in a completely randomized design and allocated in twelve paddocks composed of Urochloa brizantha (A. Rich.) Stapf. cv. Xaraés. A protein-energetic supplementation of 3 g/kg of BW per day was provided to all animals. Supplements were: without additives (WA), monensin alone at 80 mg/kg of product (MN), virginiamycin alone at 150 mg/kg of product (VM), and monensin (80 mg/kg of product) combined with virginiamycin (150 mg/kg of product; MNVM). Treatments did not affect intakes of total dry matter (DM), supplement DM, and nutrients. However, the intakes of forage DM and crude protein decreased in cattle fed MNVM compared with animals fed WA, MN, and VM. Total volatile fatty acids increased in animals fed VM. Ruminal NH3-N decreased, and pH increased in animals fed MN, VM, and MNVM. Relative abundance of total F. succinogenes and S. ruminantium decreased and R. flavefaciens increased in animals fed MN and VM at d 118. Treatments had no effect on enteric CH4 emissions. The average daily gain (ADG) and total gain were greater in cattle fed MNVM than in cattle fed MN. Combination of monensin and virginiamycin altered the rumen microbial populations but did not decrease enteric CH4 emissions. However, it decreased forage dry matter intake without altering the ADG and total weight gain, leading to an increase in feed efficiency. Results from this study indicate an advantage in including feed additives combined in the diet of supplemented Nellore cattle grazing tropical grass during the rainy season. (AU)

• FAPESP's process: 15/01147-0 - EFFECT OF NUTRITIONAL PLANS IN STOCKER GRAZING ON GROWTH PHYSIOLOGY, METABOLIC PARAMETERS AND MEAT QUALITY OF YOUNG BULLS FROM DIFFERENT GENETIC TYPES FINISHED IN PASTURE OR FEEDLOT
• Grantee: Telma Teresinha Berchielli
• Support Opportunities: Regular Research Grants
• FAPESP's process: 19/12740-5 - Metabolizable protein effects on the acute-phase inflammatory response following environmental and dietary changes of finishing beef cattle
• Grantee: Lorrayny Galoro da Silva
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 17/02034-0 - Degradation and in situ ruminal microbial dynamics of different sources of protein for beef cattle
• Grantee: Yury Tatiana Granja Salcedo
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 15/05216-7 - Additives in suplementation of Nellore young bulls finished in pasture at the rainy season
• Grantee: Erick Escobar Dallantonia
• Support Opportunities: Scholarships in Brazil - Master