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Energy and protein requirements for maintenance of Texel lambs

Published online by Cambridge University Press:  21 February 2019

A. A. Martins ,
C. J. Härter Open the ORCID record for C. J. Härter [Opens in a new window] ,
R. S. Venturini ,
J. H. Motta ,
W. S. Teixeira ,
S. Macari ,
S. Carvalho  and
C. C. Pires
A. A. Martins
Affiliation:
Departamento de Zootecnia, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brasil
C. J. Härter*
Affiliation:
Departamento de Zootecnia, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brasil
R. S. Venturini
Affiliation:
Departamento de Zootecnia, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brasil
J. H. Motta
Affiliation:
Departamento de Zootecnia, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brasil
W. S. Teixeira
Affiliation:
Departamento de Zootecnia, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brasil
S. Macari
Affiliation:
Departamento de Zootecnia, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brasil
S. Carvalho
Affiliation:
Departamento de Zootecnia, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brasil
C. C. Pires
Affiliation:
Departamento de Zootecnia, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brasil
*
†E-mail: harter.carla@gmail.com
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Abstract

It can be hypothesized that the body composition characteristics of different sheep breeds affect their nutritional requirements. However, no study has yet been carried out to determine the nutritional requirements for maintenance of Texel purebred lambs, despite their growing importance in sheep meat production globally. Our objective was therefore to determine the energy and protein requirements for maintenance of Texel lambs. Thirty-four Texel lambs were used, all intact males that were weaned at 50 days old, and confined in individual pens. Two experiments were conducted, as follows. In Experiment 1, a digestibility assay was performed to determine the dietary energy value, in a 3×3 double Latin square design, in which lambs were submitted to three levels of feed restriction (0%, 55% and 70% of ad libitum feed intake). In Experiment 2, the energy and protein requirements for maintenance of Texel lambs from 21 to 40 kg BW were determined using a randomized block design, in which lambs were also submitted to three levels of feed restriction (0%, 55% and 70% of ad libitum feed intake). The requirements for net energy for maintenance (NEm), metabolizable energy for maintenance (MEm), net protein for maintenance (NPm) and metabolizable protein for maintenance (MPm) were determined. The digestibility of dry matter, energy, protein and metabolizability were similar between food restriction levels, averaging 74.4%, 75.5%, 80.3% and 0.636, respectively. The NEm determined for growing Texel lambs was 263 kJ/kg of the metabolic fasting BW (FBW), the MEm was 417 kJ/kg0.75 FBW and the efficiency of use of MEm was 0.63. In addition, the NPm was 1.24 g/day per kg0.75 FBW and the MPm was 2.98 g/day per kg0.75 FBW. The energy requirements of Texel lambs are different from those reported in the literature, possibly due to differences between breeds, diets and environmental effects, whereas the protein requirements are different from literature mainly due to methodological differences; further studies are need to address these aspects that affects the nutritional requirements for raising sheep from different breeds in different environments.

Keywords

growing lambsheat productionmetabolizabilitynet requirementsretained protein
Type
Research Article
Information
animal , Volume 13 , Issue 9 , September 2019 , pp. 1865 - 1873
Copyright
© The Animal Consortium 2019 

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Footnotes

a

Present address: Departamento de Zootecnia, Universidade Federal de Pelotas, Pelotas 96050-500, RS, Brasil.

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