Microbial community characterization and ruminal fermentation pattern of Angus and Nellore cattle during adaptation to high energy diets with different nutritional strategies

• Grant number: 18/17983-0
• Support Opportunities: Scholarships in Brazil - Doctorate
• Effective date (Start): April 01, 2019
• Effective date (End): December 31, 2021
• Field of knowledge: Agronomical Sciences - Animal Husbandry - Animal Nutrition and Feeding
• Principal Investigator: Danilo Domingues Millen
• Grantee: Ana Carolina Janssen Pinto
• Host Institution: Faculdade de Medicina Veterinária e Zootecnia (FMVZ). Universidade Estadual Paulista (UNESP). Campus de Botucatu. Botucatu , SP, Brazil
• Associated scholarship(s): 19/26533-1 - Microbial community characterization of Angus and Nellore cattle during adaptation to high energy diets with different nutritional strategies, BE.EP.DR

Abstract

The objective of this study is to evaluate the effect of different nutritional strategies during the adaptation and finishing period on ruminal fermentation patterns and microbial community of cannulated Angus and Nellore cattle. Four 30-mo-old Nellore and four 30-mo-old Angus steers will be used, with initial body weight of approximately 450 kg, which will be divided into two 4 x 4 Latin squares, where each square will be composed of animals from same breed. The periods will be divided as follows: 14 days of adaptation diet (5 days of adaptation 1- 65% concentrate, 4 days of adaptation 2- 70% concentrate and 5 days of adaptation 3- 75% concentrate) and 18 days of finishing diet (80% concentrate). The diets provided will differ only with respect to the corn grain processing method and the presence or absence of sodium monensin. The treatments will be as follows: T1) Finely ground corn + monensin (30ppm); T2) Finely ground corn; T3) High moisture corn + monensin (30ppm) and T4) High moisture corn. The study will last 158 days, in which animals will be submitted to four experimental periods (32 days each one) and three washout intervals (10 days) between the periods 1 and 2, 2 and 3 and 3 and 4. The rumen pH and temperature will be monitored through the use of data loggers and it will be evaluated the concentrations of ruminal short chain fatty acids, ammonia and lactic acid; total tract digestibility, ruminal degradability of nutrients, as well as samples of ruminal content will be submitted to bacterial community sequencing and to the protozoa counting. All variables will be measured during adaptation and termination periods. (AU)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

PINTO, Ana Carolina Janssen. Characterization of the microbial community and pattern of ruminal fermentation of Angus and Nellore cattle during adaptation to diets with high energy content with different nutritional strategies. 2022. Doctoral Thesis - Universidade Estadual Paulista (Unesp). Faculdade de Medicina Veterinária e Zootecnia. Botucatu Botucatu.