Performance, feeding behavior, carcass traits, rumen health, and starch digestibility of Nellore and 1/2 Angus/Nellore cattle adapted in feedlot for 9 or 14 days

• Grant number: 12/50643-2
• Support Opportunities: Regular Research Grants
• Duration: September 01, 2013 - August 31, 2015
• Field of knowledge: Agronomical Sciences - Animal Husbandry - Animal Nutrition and Feeding
• Convênio/Acordo: CNPq - First Projects Program
• Principal Investigator: Danilo Domingues Millen
• Grantee: Danilo Domingues Millen
• Host Institution: Universidade Estadual Paulista (UNESP). Campus Experimental de Dracena. Dracena , SP, Brazil

Abstract

The objective of this study will be to evaluate the length of adaptation period to high concentrate diets on performance, feeding behavior, carcass and meat traits, rumen health and starch digestibility of Nellore and ½ Angus/Nellore cattle finished in feedlot. Forty-eight yearling bulls (385 kg), 24 Nellore and 24 ½ Angus/Nellore, back grounded on pasture will be randomly allocated and kept in 48 individual pens with concrete floor (10 m2 and 1,0 m bunk per animal) according to the treatments: Tl: Nellore adapted for 9 days, T2: Nellore adapted for 14 days, T3: ½ Angus/Nellore adapted for 9 days, and T4: ½ Angus/Nellore adapted for 14 days), characterizing a completely randomized design with a 2 x 2 factorial arrangement of treatments (2 genotypes and 2 lengths of adaptation period) with repeated measures over time according to the dependent variable measured. Each treatment will be composed by 12 replications (animals) in this study. After 9 or 14 days of adaptation, yearling bulls will receive the finishing diet containing 86% concentrate. At the beginning of experimental period and every 28 days, yearling bulls will be weighed. Dry matter intake will be measured every day, and average daily gain and feed efficiency will be calculated. Likewise, the deposition of muscle and fat will be evaluated by ultrasound at the beginning and at the end of the study. Yearling bulls will be slaughtered in a commercial abattoir when an average body weight of 490 kg is reached after 84 days on feed. Samples of meat, rumen epithelium, and feces will be collected for future analysis of meat quality, rumen health, and starch digestibility, respectively. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

WATANABE, DANIEL HIDEKI MARIANO; BERTOLDI, GUSTAVO PERINA; DOS SANTOS, ANDERSON AUGUSTO; DA SILVA FILHO, WILSON INACIO; DE OLIVEIRA, LUCAS FELIPE REBESCHINI; PINTO, ANA CAROLINA JANSSEN; CEOLA STEFANO PEREIRA, MURILLO; ESTEVAM, DANIELA DUTRA; SQUIZATTI, MARIANA MARTINS; PINHEIRO, RAFAEL SILVIO BONILHA; et al. Growth performance and rumen morphometrics of Nellore and 1/2 Angus/Nellore feedlot cattle adapted over 9 and 14 days to high-concentrate diets. JOURNAL OF ANIMAL PHYSIOLOGY AND ANIMAL NUTRITION, MAR 2021. (13/21666-7, 12/50643-2)

WATANABE, DANIEL HIDEKI MARIANO; BERTOLDI, GUSTAVO PERINA; DOS SANTOS, ANDERSON AUGUSTO; DA SILVA FILHO, WILSON INACIO; DE OLIVEIRA, LUCAS FELIPE REBESCHINI; PINTO, ANA CAROLINA JANSSEN; CEOLA STEFANO PEREIRA, MURILLO; ESTEVAM, DANIELA DUTRA; SQUIZATTI, MARIANA MARTINS; PINHEIRO, RAFAEL SILVIO BONILHA; et al. rowth performance and rumen morphometrics of Nellore and 1/2 Angus/Nellore feedlot cattle adapted over 9 and 14 days to high-concentrate diet. JOURNAL OF ANIMAL PHYSIOLOGY AND ANIMAL NUTRITION, v. 106, n. 1, p. 12-23, JAN 2022. (12/50643-2, 13/21666-7)