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Meta-analysis of spineless cactus feeding to meat lambs: performance and development of mathematical models to predict dry matter intake and average daily gain

Published online by Cambridge University Press:  06 March 2019

L. S. Knupp ,
F. F. R. Carvalho ,
A. Cannas ,
M. I. Marcondes ,
A. L. Silva Open the ORCID record for A. L. Silva [Opens in a new window] ,
A. H. D. Francesconi ,
G. R. Beltrão da Cruz ,
A. S. Atzori ,
G. Gaspa  and
R. G. Costa Open the ORCID record for R. G. Costa [Opens in a new window]
L. S. Knupp
Affiliation:
Departamento de Zootecnia, Universidade Federal da Paraíba, Rodovia BR 079 km 12, Areia, 58397-000 Paraíba, Brazil
F. F. R. Carvalho
Affiliation:
Departamento de Zootecnia, Universidade Federal Rural do Pernambuco, Rua Dom Manoel de Medeiros s/n, Recife, 52171-900 Pernambuco, Brazil
A. Cannas
Affiliation:
Dipartimento di Agraria - Sezione di Scienze Zootecniche, Università degli studi di Sassari, Via de Nicola 9, 07100 Sassari, Italy
M. I. Marcondes
Affiliation:
Departamento de Zootecnia, Universidade Federal de Viçosa, Avenida P. H. Rolfs s/n, Viçosa, 36570-900 Minas Gerais, Brazil
A. L. Silva
Affiliation:
Departamento de Zootecnia, Universidade Federal de Viçosa, Avenida P. H. Rolfs s/n, Viçosa, 36570-900 Minas Gerais, Brazil
A. H. D. Francesconi
Affiliation:
Dipartimento di Agraria - Sezione di Scienze Zootecniche, Università degli studi di Sassari, Via de Nicola 9, 07100 Sassari, Italy
G. R. Beltrão da Cruz
Affiliation:
Departamento de Zootecnia, Universidade Federal da Paraíba, Rodovia BR 079 km 12, Areia, 58397-000 Paraíba, Brazil
A. S. Atzori
Affiliation:
Dipartimento di Agraria - Sezione di Scienze Zootecniche, Università degli studi di Sassari, Via de Nicola 9, 07100 Sassari, Italy
G. Gaspa
Affiliation:
Dipartimento di Agraria - Sezione di Scienze Zootecniche, Università degli studi di Sassari, Via de Nicola 9, 07100 Sassari, Italy
R. G. Costa*
Affiliation:
Departamento de Zootecnia, Universidade Federal da Paraíba, Rodovia BR 079 km 12, Areia, 58397-000 Paraíba, Brazil
*
†E-mail: [email protected]
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Abstract

Spineless cactus is a useful feed for various animal species in arid and semiarid regions due to its adaptability to dry and harsh soil, high efficiency of water use and carbohydrates storage. This meta-analysis was carried out to assess the effect of spineless cactus on animal performance, and develop and evaluate equations to predict dry matter intake (DMI) and average daily gain (ADG) in meat lambs. Equations for predicting DMI and ADG as a function of animal and diet characteristics were developed using data from eight experiments. The dataset was comprised of 40 treatment means from 289 meat lambs, in which cactus was included from 0 to 75% of the diet dry matter (DM). Accuracy and precision were evaluated by cross-validation using the mean square error of prediction (MSEP), which was decomposed into mean bias, systematic bias and random error; concordance correlation coefficient, which was decomposed into accuracy (Cb) and precision (ρ); and coefficient of determination (R2). In addition, the data set was used to evaluate the predicting accuracy and precision of the main lamb feeding systems (Agricultural and Food Research Council, Small Ruminant Nutritional System, National Research Council and Institut National de la Recherche Agronomique) and also two Brazilian studies. The DMI, CP intake (CPI), metabolizable energy (ME) intake and ADG increased when cactus was included up to 499 g/kg DM (P<0.001). In contrast, animals fed high levels of cactus (>500 g/kg DM) had a decreased DMI, CPI and NDF intake, but increased feed efficiency (P<0.001) and similar ADG compared with those without cactus addition. The DMI was positively correlated with initial BW, final BW, concentrate and ADG, while it was negatively correlated with cactus inclusion and ME of the diet. On other hand, ADG was positively correlated with DMI, initial and mean BW and concentrate, and it was negatively correlated with cactus inclusion. The two developed equations had high accuracy (Cb of 0.95 for DMI and 0.94 for ADG) and the random error of MSEP was 99% for both equations. The precision of both equations was moderate, with R2 values of 0.53 and 0.50 and ρ values of 0.73 and 0.71 for DMI and ADG, respectively. In conclusion, the developed equation to predict DMI had moderate precision and high accuracy, nonetheless, it was more efficient than those reported in the literature. The proposed equations can be a useful alternative to estimate intake and performance of lambs fed cactus.

Keywords

nutrition modelsnutritional requirementsOpuntia ficus-indicasemiaridsheep
Type
Research Article
Information
animal , Volume 13 , Issue 10 , October 2019 , pp. 2260 - 2267
Copyright
© The Animal Consortium 2019 

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Footnotes

a

Present address: Department of Animal Production, Institute of Animal Science, Universidade Federal Rural do Rio de Janeiro, Km 47, Seropédica, 23897-005 Rio de Janeiro, Brazil.

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