Performance, nutritional requirements, and carcass and meat trais of Dorper × Santa Inês crossbred lambs fed diets composed by different roughages

• Grant number: 08/05300-4
• Support type: Scholarships in Brazil - Doctorate
• Effective date (Start): October 01, 2008
• Effective date (End): October 31, 2010
• Field of knowledge: Agronomical Sciences - Animal Husbandry - Animal Nutrition and Feeding
• Principal researcher: Alexandre Vaz Pires
• Grantee: Diego Barcelos Galvani
• Home Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil

Abstract

Two studies will be conducted to determine energy and protein requirements, as well as the carcass and meat traits of feedlot ½ Dorper × ½ Santa Inês crossbred lambs fed diets with different quality roughages. In the first study, 84 lambs weaned at 56 days of age will be assigned, according to the initial body weight, to one of two groups (VBQ - animals fed with a diet composed by a low quality roughage; and VAQ - animals fed with a diet composed by a high quality roughage) to determine their nutritional requirements based on a comparative slaughter trial. Seven animals of each group will be used to estimate body composition of lambs at the beginning of the experiment (baseline group). After, twenty one lambs of each group will be fed ad libitum and slaughtered either at 25, 35 or 45 kg BW. The remaining 14 lambs of each group will be then assigned to 2 levels of intake, either 75 or 55% of the ad libitum intake, being slaughtered concomitant with lambs of the 45 kg BW group. Total body N, fat and energy contents will be determined. Additional experiments (an in vivo digestibility and an in vitro gas production trial) to measure diet metabolizable energy and protein contents will be conducted. In the second study, the objective is to evaluate carcass traits, centesimal composition and fat acid profile of the meat from lambs fed diets with different quality roughages, and slaughtered either at 25, 35 or 45 kg BW.

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)

GALVANI, DIEGO B.; PIRES, V, ALEXANDRE; SUSIN, IVANETE; GOUVEA, VINICIUS N.; BERNDT, ALEXANDRE; ABDALLA, ADIBE L.; TEDESCHI, LUIS O. Net protein requirements and metabolizable protein use for growing ram lambs fed diets differing in concentrate level and roughage source. Small Ruminant Research, v. 165, p. 79-86, AUG 2018. Web of Science Citations: 0.

GALVANI, D. B.; PIRES, A. V.; SUSIN, I.; GOUVEA, V. N.; BERNDT, A.; CHAGAS, L. J.; DOREA, J. R. R.; ABDALLA, A. L.; TEDESCHI, L. O. Energy efficiency of growing ram lambs fed concentrate-based diets with different roughage sources. JOURNAL OF ANIMAL SCIENCE, v. 92, n. 1, p. 250-263, JAN 2014. Web of Science Citations: 18.