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Feed energy utilization by hair sheep: does the 0.82 conversion factor of digestible to metabolizable energy need to be revised?

Published online by Cambridge University Press:  14 December 2023

A. S. Brito Neto ,
C. J. L. Herbster ,
L. C. Geraseev ,
G. L. Macedo Junior ,
D. R. Nascimento ,
A. C. Rocha ,
M. I. B. Pereira ,
M. I. Marcondes Open the ORCID record for M. I. Marcondes [Opens in a new window] ,
L. P. Silva Open the ORCID record for L. P. Silva [Opens in a new window]  and
L. R. Bezerra Open the ORCID record for L. R. Bezerra [Opens in a new window]
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A. S. Brito Neto
Affiliation:
Department of Animal Science, Federal University of Ceara, Fortaleza, CE, Brazil
C. J. L. Herbster
Affiliation:
Department of Animal Science, Federal University of Ceara, Fortaleza, CE, Brazil
L. C. Geraseev
Affiliation:
Agricultural Sciences Center, Federal University of Minas Gerais, Montes Claros, MG, Brazil
G. L. Macedo Junior
Affiliation:
College of Veterinary Medicine, Federal University of Uberlandia, Uberlandia, MG, Brazil
D. R. Nascimento
Affiliation:
Department of Animal Science, Federal University of Ceara, Fortaleza, CE, Brazil
A. C. Rocha
Affiliation:
Department of Animal Science, Federal University of Ceara, Fortaleza, CE, Brazil
M. I. B. Pereira
Affiliation:
Department of Agricultural and Environmental Sciences, State University of Santa Cruz, Ilhéus, BA, Brazil
M. I. Marcondes
Affiliation:
Department of Animal Sciences, Washington State University, Pullman, WA, USA
L. P. Silva
Affiliation:
Department of Animal Science, Federal University of Ceara, Fortaleza, CE, Brazil
L. R. Bezerra
Affiliation:
Center of Health and Agricultural Technology, Federal University of Campina Grande, Patos, PB, Brazil
R. L. Oliveira
Affiliation:
Department of Veterinary Medicine and Animal Science, Federal University of Bahia, Salvador, BA, Brazil
E. S. Pereira*
Affiliation:
Department of Animal Science, Federal University of Ceara, Fortaleza, CE, Brazil
*
Corresponding author: E. S. Pereira; Email: elzania@hotmail.com
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Abstract

The objective was to evaluate energy partitioning and predict the relationship between metabolizable energy (ME) and digestible energy (DE) in hair sheep fed tropical diets at three feeding levels (maintenance, intermediate and high). To evaluate the energy partition, a database with 114 records (54 non-castrated males and 60 females) from comparative slaughter studies was used. To estimate the ratio ME:DE, 207 observations (74 non-castrated males and 133 females) were used from six studies in a multi-study approach, two indirect calorimetry studies (n = 93) and four comparative slaughter (n = 114), using a mixed model and study as random effect. A simple linear regression equation of the ME against DE was fitted to predict the efficiency of DE to ME conversion. Gas losses were greatest (P < 0.05) for animals fed at maintenance level (7.92% of gross energy intake). The variations of energy losses in the urine were 2.64, 2.06 and 2.08%; faecal losses were 34.37, 37.80 and 36.91% for maintenance, intermediary and high level of feeding, respectively. The regression analysis suggested a strong linear relationship between ME and DE, generating the model ME (MJ/day) = −0.1559 (±0.07525) + 0.8503 (±0.005864) × DE (MJ/day). This study highlights the importance of the relationship ME:DE. Equation/factor 0.85 presented herein is alternative that could be used for the calculation of ME from DE in feedlot diets tropical. In conclusion, we suggest that for hair sheep fed tropical diets the conversion factor 0.85 is more adequate to predict ME from DE.

Keywords

comparative slaughterenergy balanceenergy partitionrequirementsrespirometry
Type
Animal Research Paper
Information
The Journal of Agricultural Science , Volume 161 , Issue 5 , October 2023 , pp. 734 - 742
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Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press

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