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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.18.0825    [Accepted] Published online February 14, 2019.
Carcass characteristics of lambs fed diets with increasing levels of crude glycerin
Caio Alves da Costa1, Francisco Fernando Ramos de Carvalho2, Adriana Guim2, Gilcifran Prestes de Andrade2, Daniel Barros Cardoso2,*  , Michel do Vale Maciel2, Gabriela Gonçalves da Silva3, Andreza Guedes de Oliveira Nascimento2
1Department of Animal Science, Federal University of Roraima, UFRR, Boa Vista, Roraima, Brazil
2Department of Animal Science, Federal Rural University of Pernambuco, UFRPE, Recife, Pernambuco, Brazil
3Department of Veterinary Medicine, Federal Rural University of Pernambuco, UFRPE, Recife, Pernambuco, Brazil
Correspondence:  Daniel Barros Cardoso, Tel: +55-81-3320-6555, Fax: +55-81-3320-6555, Email: danbarrc@hotmail.com
Received: 3 November 2018   • Revised: 22 December 2018   • Accepted: 28 January 2019
Abstract
Objective: An experiment was conducted to the effects of increasing levels of crude glycerin (0, 6, 12 and 18%) used as a substitute for corn in lamb feed on the quantitative characteristics of the carcass.

Methods

A total of 40 crossbred Santa Inês lambs that were four months old with a mean initial weight of 21.0 ± 0.8 kg were randomly distributed in four treatments with ten replicates. The animals were slaughtered after 66 days of confinement. The effects of crude glycerin as a replacement for corn in the diet of the lambs on the carcass characteristics, commercial cut weight and yield and carcass measurements were studied.

Results

There was an increasing linear effect for body weight at slaughter with the replacement of corn by crude glycerin. The dry matter (DM) and metabolizable energy (ME) intakes, weight of the empty body, hot carcass weight and cold carcass weight showed a quadratic effect, with maximum crude glycerin levels estimated at 10.9, 9.8, 10.83, 11.78 and 11.35%, respectively. The initial pH was not influenced by the substitution of corn for crude glycerin, while the final pH presented a quadratic effect. The other parameters of the carcass and the weights and yields of commercial cuts were not influenced. There was also no effect of the diets on carcass morphometric measurements, except for the thoracic perimeter and the carcass compactness index, which presented quadratic and linear effects, respectively.
Conclusion
Crude glycerin can replace up to 18% of corn because favour the muscle tissue deposition without promoting changes in the main carcass characteristics of lambs.
Keywords: Glycerol; Energy; Performance; Sheep; Meat


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