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Effect of chitosan on production performance of feedlot lambs

Published online by Cambridge University Press:  13 March 2019

F. M. Pereira ,
G. G. P. Carvalho ,
T. S. Magalhães ,
J. E. Freitas Júnior ,
L. F. B. Pinto ,
G. B. Mourão ,
A. J. V. Pires ,
C. E. Eiras ,
D. Novais-Eiras  and
J. A. G. Azevêdo
...Show all authors
F. M. Pereira
Affiliation:
State University of Southeast Bahia, Itapetinga, Bahia, Brazil
G. G. P. Carvalho*
Affiliation:
Federal University of Bahia, Salvador, Bahia, Brazil
T. S. Magalhães
Affiliation:
Federal University of Bahia, Salvador, Bahia, Brazil
J. E. Freitas Júnior
Affiliation:
Federal University of Bahia, Salvador, Bahia, Brazil
L. F. B. Pinto
Affiliation:
Federal University of Bahia, Salvador, Bahia, Brazil
G. B. Mourão
Affiliation:
University of São Paulo, Piracicaba, São Paulo, Brazil
A. J. V. Pires
Affiliation:
State University of Southeast Bahia, Itapetinga, Bahia, Brazil
C. E. Eiras
Affiliation:
Federal University of Bahia, Salvador, Bahia, Brazil
D. Novais-Eiras
Affiliation:
Federal University of Bahia, Salvador, Bahia, Brazil
J. A. G. Azevêdo
Affiliation:
State University of Santa Cruz, Ilhéus, Bahia, Brazil
A. Eustáquio Filho
Affiliation:
Federal Institute of Northern Minas Gerais, Salinas, Minas Gerais, Brazil
*
Author for correspondence: G. G. P. Carvalho, E-mail: [email protected]
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Abstract

Intake, digestibility, nitrogen (N) balance, microbial protein synthesis, weight gain, yields of the main commercial cuts and carcass morphometric measurements were evaluated in lambs fed diets containing different levels of chitosan. Sixty Santa Inês crossbred sheep with an average body weight (BW) of 24 ± 2.2 kg were assigned to three treatments (diets containing 0, 136 or 272 mg chitosan/kg BW) in a completely randomized design. There was no effect of chitosan on dry matter (DM) intake. Ingested and retained N showed a quadratic response, with the highest values estimated at the chitosan levels of 142 and 152 mg/kg BW, respectively. Similar to N balance, microbial protein synthesis showed the same quadratic response, in which the level of 136 mg/kg BW resulted in higher synthesis when compared with the other levels. No effect of chitosan was detected on average daily gain, final weight, or carcass variables (hot carcass weight, cold carcass weight, yield of commercial cuts and morphometric measurements of the carcass). Conformation, visceral fat content and fatness of carcasses were also not altered by the use of chitosan. Chitosan improves the digestibility of DM, crude protein and neutral detergent fibre, and increases N balance and microbial protein synthesis but does not change the production performance of feedlot lambs.

Keywords

Additivedigestibilityintake
Type
Animal Research Paper
Information
The Journal of Agricultural Science , Volume 156 , Issue 9 , November 2018 , pp. 1138 - 1144
Copyright
Copyright © Cambridge University Press 2019 

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