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Weight adjustment equation for hair sheep raised in warm conditions

Published online by Cambridge University Press:  09 March 2020

C. J. L. Herbster ,
L. P. Silva Open the ORCID record for L. P. Silva [Opens in a new window] ,
M. I. Marcondes Open the ORCID record for M. I. Marcondes [Opens in a new window] ,
I. F. F. Garcia Open the ORCID record for I. F. F. Garcia [Opens in a new window] ,
R. L. Oliveira Open the ORCID record for R. L. Oliveira [Opens in a new window] ,
L. S. Cabral Open the ORCID record for L. S. Cabral [Opens in a new window] ,
J. G. Souza Open the ORCID record for J. G. Souza [Opens in a new window]  and
E. S. Pereira Open the ORCID record for E. S. Pereira [Opens in a new window]
C. J. L. Herbster
Affiliation:
Animal Science Department, Federal University of Ceara, 2977, Mister Hull Avenue, Fortaleza60356000, Ceara, Brazil
L. P. Silva
Affiliation:
Animal Science Department, Federal University of Ceara, 2977, Mister Hull Avenue, Fortaleza60356000, Ceara, Brazil
M. I. Marcondes
Affiliation:
Animal Science Department, Federal University of Viçosa, P.H. Rolfs Avenue, Viçosa36575000, Minas Gerais, Brazil
I. F. F. Garcia
Affiliation:
Animal Science Department, Federal University of Lavras, Lavras37200000, Minas Gerais, Brazil
R. L. Oliveira
Affiliation:
Department of Veterinary Medicine and Animal Science, Federal University of Bahia, 500 Adhemar de Barros Avenue, Salvador40170110, Bahia, Brazil
L. S. Cabral
Affiliation:
Animal Science Department, Federal University of Mato Grosso, 2367, Fernando Correia da Costa Avenue, Cuiaba780609000, Mato Grosso, Brazil
J. G. Souza
Affiliation:
Animal Science Department, Federal University of Ceara, 2977, Mister Hull Avenue, Fortaleza60356000, Ceara, Brazil
E. S. Pereira*
Affiliation:
Animal Science Department, Federal University of Ceara, 2977, Mister Hull Avenue, Fortaleza60356000, Ceara, Brazil
*
†E-mail: [email protected]
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Abstract

To estimate the nutritional requirements of hair sheep, knowledge about the animal’s weight and its relationships with growth performances is essential. A study was carried with the objective to establish the relationships between BW, fasting BW (FBW), empty BW (EBW), average daily gain (ADG) and empty BW gain (EBWG) for hair sheep in growing and finishing phases in Brazilian conditions. Databases were obtained from 32 studies, for a total of 1145 observations; there were 3 sex classes (non-castrated male, castrated male and female) and 2 feeding systems (pasture and feedlot). The most representative breeds in the database were Santa Ines (n = 473), Morada Nova (n = 70) and Brazilian Somali (n = 47). The other animals in the database were crossbreeds (n = 555). The FBW (kg), EBW and EBWG (kg/day) were estimated according to linear regression. A random coefficient model was adopted, considering the study as a random effect and including the possibility of covariance between the slope and the intercept. The coefficients obtained from the linear regression of the FBW against the BW, EBW against the FBW and EBWG against the ADG did not differ between sex class (P > 0.05) and genotype (P > 0.05). The equations generated to estimate FBW from the BW, EBW from the FBW and EBWG from the ADG are as follows: FBW = −0.5470 (±0.2025) + 0.9313(±0.019) × BW, EBW = −1.4944 (±0.3639) + 0.8816 (±0.018) × FBW and EBWG = 0.906 (±0.019) × ADG, respectively. The low mean squared error values found in the cross-validation confirmed the reliability of these equations. Considering a sheep with a BW of 30 kg and a 100 g ADG, the estimated FBW, EBW and EBWG calculated using the generated equations are 27, 22.65 and 0.090 kg, respectively. In conclusion, the generated equations can be used in growing hair sheep. The validation procedure applied to the generated equations showed that its use for hair sheep seems to be appropriate.

Keywords

empty body weightgrowingmathematical modelspredictionweight gain
Type
Research Article
Information
animal , Volume 14 , Issue 8 , August 2020 , pp. 1718 - 1723
Copyright
© The Animal Consortium 2020

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