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Impact of different supplementation strategies on Nellore heifers on nutritional and reproductive performance

Grant number: 18/20176-0
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): February 01, 2019
Effective date (End): January 31, 2021
Field of knowledge:Agronomical Sciences - Animal Husbandry - Animal Nutrition and Feeding
Principal researcher:Flávio Dutra de Resende
Grantee:Laura Franco Prados
Home Institution: Instituto de Zootecnia. Agência Paulista de Tecnologia dos Agronegócios (APTA). Secretaria de Agricultura e Abastecimento (São Paulo - Estado). Nova Odessa , SP, Brazil
Associated research grant:17/50339-5 - Institutional research development plan of the Animal Science Institute (PDIp), AP.PDIP

Abstract

The Brazilian herd is composed almost entirely of Bos indicus animals, which are more adapted to the tropical climate and non-precocious. Reproductive characteristics have low heritability, showing that nutrition and the environment can influence. The objective of the project is to define the best nutritional strategy in the Nellore heifers growing to reach the body weight (BW) for attainment the puberty with 14 months. The experiment will be carried out at APTA/Colina-SP. A total of 126 weaned heifers weighing 180 kg (7-8 months) will be used. The experimental design will be in a randomized block, consisting of 18 experimental units, consisting of the paddock/pen (7 animals each), distributed in three treatments until the diagnosis of gestation of the second artificial insemination at fixed time: feedlot, fixed supplementation (10 g/kg BW) and increasing supplementation (8 to 12 g/kg BW). The pasture is composed of Brachiaria brizantha and the supplementation will be done daily at 10 h in the morning and the diet in the feedlot will be provided twice a day. Performance characteristics, grazing evaluations, body condition score, biometric measurements, and carcass and reproductive ultrasonography will be done every 42 days or at strategic heifer development points. At the start of the breeding season, a heifer from each paddock/pen will be slaughtered for determination of the gene expression of some reproduction-related genes. After the diagnosis of gestation of the second insemination, all heifers will be managed similarly and together for estrus synchronization and artificial insemination. The analysis of the data will be done using the PROC MIXED and GLIMMIX of SAS, considering a 5% probability for the type I error and the means will be compared by the tukey test.

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Scientific publications (5)
(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)
NASCIMENTO, FELIPE A.; SILVA, NAIARA C.; PRADOS, LAURA F.; PACHECO, RODRIGO D. L.; JOHNSON, BRADLEY J.; CAPPELLOZZA, I, BRUNO; RESENDE, FLAVIO D.; SIQUEIRA, GUSTAVO R. Calcium salts of fatty acids with varying fatty acid profiles in diets of feedlot-finished Bos indicus bulls: impacts on intake, digestibility, performance, and carcass and meat characteristics. JOURNAL OF ANIMAL SCIENCE, v. 98, n. 12 DEC 2020. Web of Science Citations: 0.
CUSTODIO, L.; PRADOS, L. F.; FIGUEIRA, D. N.; YIANNIKOURIS, A.; GLORIA, E. M.; HOLDER, V. B.; PETTIGREW, J. E.; SANTIN, E.; RESENDE, F. D.; SIQUEIRA, G. R. Mycotoxin-contaminated diets and an adsorbent affect the performance of Nellore bulls finished in feedlots. ANIMAL, v. 14, n. 10, p. 2074-2082, OCT 2020. Web of Science Citations: 0.
MOTA, VERONICA A. C.; FERNANDES, RODOLFO M.; PRADOS, LAURA F.; ALVES NETO, JOAO A.; BERTI, GUILHERME F.; RESENDE, FLAVIO D.; SIQUEIRA, GUSTAVO R. Relationship between gain rate during the growing phase and forage allowance in the finishing phase in Nellore cattle. TROPICAL ANIMAL HEALTH AND PRODUCTION, v. 52, n. 4, p. 1881-1891, JUL 2020. Web of Science Citations: 0.
VELLINI, BEATRIZ L.; PRADOS, LAURA F.; MONCAO, FLAVIO P.; FIREMAN, ALBA K.; RESENDE, FLAVIO D.; SIQUEIRA, GUSTAVO R. Zinc amino acid complex in association with chromium methionine improves the feed efficiency of finished Nellore cattle in the feedlot. ANIMAL FEED SCIENCE AND TECHNOLOGY, v. 262, APR 2020. Web of Science Citations: 0.
LETÍCIA CUSTÓDIO; LAURA FRANCO PRADOS; ALEXANDROS YIANNIKOURIS; VAUGHN HOLDER; JAMES PETTIGREW; LEANDRO KURITZA; FLÁVIO DUTRA DE RESENDE; GUSTAVO REZENDE SIQUEIRA. Mycotoxin contamination of diets for beef cattle finishing in feedlot. REVISTA BRASILEIRA DE ZOOTECNIA-BRAZILIAN JOURNAL OF ANIMAL SCIENCE, v. 48, p. -, 2019. Web of Science Citations: 0.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.