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Genotype effects on energy and protein requirements in growing male goats

Published online by Cambridge University Press:  16 March 2020

A. K. Almeida Open the ORCID record for A. K. Almeida [Opens in a new window] ,
E. Kebreab Open the ORCID record for E. Kebreab [Opens in a new window] ,
K. T. Resende Open the ORCID record for K. T. Resende [Opens in a new window] ,
A. N. Medeiros Open the ORCID record for A. N. Medeiros [Opens in a new window]  and
I. A. M. A. Teixeira Open the ORCID record for I. A. M. A. Teixeira [Opens in a new window]
A. K. Almeida
Affiliation:
Department of Animal Science, UNESP – Universidade Estadual Paulista, Jaboticabal, SP14884-900, Brazil
E. Kebreab
Affiliation:
Department of Animal Science, University of California, Davis, CA95616, USA
K. T. Resende
Affiliation:
Department of Animal Science, UNESP – Universidade Estadual Paulista, Jaboticabal, SP14884-900, Brazil
A. N. Medeiros
Affiliation:
Department of Animal Science, Universidade Federal da Paraíba, Areia, PB58397-000, Brazil
I. A. M. A. Teixeira*
Affiliation:
Department of Animal Science, UNESP – Universidade Estadual Paulista, Jaboticabal, SP14884-900, Brazil
*
†E-mail: izabelle.teixeira@unesp.br
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Abstract

Goat genotype may alter the net energy and protein requirements for maintenance (NEm and NPm, respectively) and weight gain (NEg and NPg).This study was designed to investigate and quantify the effect of goat type on NEm, NPm, NEg and NPg, and quantify the net requirements for energy and protein for dairy, meat and indigenous growing male goats. For that, comparative slaughter studies were gathered and a meta-analytical approach was used. Two distinct databases were organized: one composed of 233 individual records from 11 studies of meat (n = 81), dairy (n = 97) and indigenous (n = 55) growing male goats weighing from 4.50 to 51.0 kg, to depict NEm and NPm; and another database composed of 239 individual records from nine studies of meat (n = 87), dairy (n = 97) and indigenous (n = 55) growing male goats weighing from 4.30 to 51.0 kg, to depict NEg and NPg. Our findings showed that NEm of meat goats was 8.5% greater (336 ± 10.8 kJ/kg0.75 of empty BW; EBW) than dairy and indigenous goats (310 ± 8.20 kJ/kg0.75 EBW; P < 0.05). Whereas, NPm was not affected by goat type (1.92 ± 0.239 g/kg EBW; P = 0.91). The NPg was 185.1 ± 1.82 g/kg of EBW gain for goats weighing 5 kg BW and 192.5 ± 4.33 g/kg of EBW gain for goats weighing 45 kg BW, and thus did not change across goat type (P = 0.12). On the other hand, NEg increased from 7.29 ± 0.191 to 11.9 ± 0.386 MJ/kg of EBW in male dairy goats, and from 7.32 ± 0.144 to 15.7 ± 0.537 MJ/kg of EBW in meat and indigenous growing male goats weighing between 5 and 45 kg BW. When body protein was used as a predictor in the allometric equation instead of EBW seeking to account for the degree of maturity, goat type differences disappeared; however, this predictor showed a high variation among individuals. In conclusion, energy and protein requirements for gain in distinct goat types reflect on body composition differences. Future research should focus on better understanding the maturity degree and its consequences in the energy requirement of growing male goats and better depict the goat type effect on it, as well as on the efficiency of utilization.

Keywords

body compositioncomparative slaughtergoat typenutritional requirementsmeta-analysis
Type
Research Article
Information
animal , Volume 14 , Issue S2: 9th Workshop on Modelling Nutrient Digestion and Utilization in Farm Animals (MODNUT) , August 2020 , pp. s323 - s331
Copyright
© The Animal Consortium 2020

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Footnotes

a

Present address: School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia

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