Estimating body weight from morphometric measurements of Sahel (Borno White) goats

Mohammed, I. D.; Amin, J. D.

doi:10.1016/s0921-4488(96)00920-0

Cited by 40 publications

(31 citation statements)

References 2 publications

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“…The determination coefficients reported by different authors for the regression models of the weights over this character are in fact equal to or higher than 0.9; the use of other characters has always been less successful (Sorensen and Foldager, 1991;Heinrichs et al, 1992;Pearson and Ouassat, 1996;Hile et al, 1997;Mohammed and Amin, 1997;Wilson et al, 1997;Panella et al, 1998;Alvarez et al, 1999;Gee et al, 2001). The use of this trait seems to be particularly suitable for large animals where the weight is hard to record by scale, but it is important to note how the use of a single measurement, easy and quick to carry out, represents a huge advantage when in practical situations like that of meat sheep, where the number of subjects to measure is often quite high and the performance could be recorded by the farmer himself.…”

Section: Introductionmentioning

confidence: 93%

The measurement of chest girth as an alternative to weight determination in the performance recording of meat sheep

Sarti¹,

Castelli²,

Bogani³

et al. 2003

Italian Journal of Animal Science

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The aim of this study was to assess, for two Italian meat sheep breeds (Appenninica and Merinizzata italiana), the relationship between an easily recorded measurement (girth of chest) and the character used for selection purposes (weight), and to define the most appropriate mathematical methods to infer the second from the first. For the Appenninica 1392 lambs were measured, for the Merinizzata italiana 1559 lambs were measured. The possibility of estimating weight through chest girth (CG) measurement was evaluated, separately for each breed, by taking the most suitable model between those including different kinds of regression effect. The model was chosen in relation to the value of the determination coefficient and the sum of square residuals. The prediction accuracy of the model was assessed by comparing the expected values with the observed ones through a number of statistical tests. A further prediction analysis was carried out using the mean values of the observed weights that fell in each 1 cm class of girth, in order to reduce the error derived by the varying numbers of observations per unit of chest girth. The model including the square regression nested within the sex effect and the flock random effect nested within the sex effect was observed to be the most suitable one to predict the weight from the chest girth; the determination coefficients ranged between 0.944 (Appenninica) and 0.955 (Merinizzata). The prediction parameters were: -10. ) for the Merinizzata females. The correlation between the observed and expected values was always higher than 0.97. The equations estimated using the mean weights for each girth showed extremely high determination coefficients (= 0.99) due to the reduction of variability implied by this method. Choosing between the equations calculated on the entire data set or on the mean weights will only be possible after a period of field tests.

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Section: Introductionmentioning

confidence: 93%

The measurement of chest girth as an alternative to weight determination in the performance recording of meat sheep

Sarti¹,

Castelli²,

Bogani³

et al. 2003

Italian Journal of Animal Science

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“…El Karin et al (1988) encontraram alta correlação entre o comprimento interno da carcaça com seu peso, assim como a medida de profundidade do tórax de ovinos com o peso da carcaça. Mohamed & Amin (1997) observaram alta correlação entre o peso corporal e as medidas biométricas em caprinos. Yáñez et al (2004), ao estudarem cabritos de raça leiteira, com 11 kg a 35 kg de peso corporal e com diferentes condições corporais, concluíram que as equações estimadas em relação ao perímetro torácico e ao comprimento corporal predizem com precisão o peso em jejum e o peso da carcaça fria destes animais.…”

Section: Introductionunclassified

Medidas biométricas obtidas in vivo e na carcaça de ovelhas de descarte em diferentes estágios fisiológicos

Pinheiro

Jorge

2010

R. Bras. Zootec.

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RESUMO -Objetivou-se determinar as medidas in vivo e na carcaça de ovelhas de descarte abatidas em diferentes estágios fisiológicos, assim como as possíveis correlações entre essas medidas objetivas (in vivo e na carcaça) e o peso corporal ao abate e da carcaça fria. Foram utilizadas 21 ovelhas da raça Santa Inês, distribuídas nos seguintes estágios fisiológicos: OL = ovelhas mantidas por 60 dias em lactação com seus cordeiros e abatidas um dia após o desmame dos mesmos; OSC = ovelhas que foram mantidas por 60 dias em lactação com seus respectivos cordeiros e mais um período aproximado de 30 dias sem os cordeiros e posteriormente abatidas; e ONP = ovelhas que permaneceram por 60 dias em confinamento e que não pariram durante o ano. Não se observou diferença entre os estágios fisiológicos na maioria das características medidas in vivo e na carcaça. O perímetro da garupa determinado na carcaça e o perímetro torácico, as larguras do peito e da garupa obtidos in vivo mostraram-se altamente correlacionados aos pesos corporal e de carcaça fria dos animais. Portanto, essas medidas podem auxiliar na determinação do peso corporal de ovelhas em diferentes estágios fisiológicos.Palavras-chave: compacidade da carcaça, correlações, ovino, peso corporal ao abate Biometric measurements obtained in vivo and in the carcass of culled ewes at different physiological stagesABSTRACT -The objective was to determine in vivo and carcass measurements of culled ewes slaughtered at different physiological stages and the possible correlations between the objective measurements (in vivo and in the carcass) and the body weight at slaughter and cold carcass weight. Twenty-one Santa Inês ewes were used, placed in the following treatments: EL = ewes which remained in lactation for 60 days with their respective lambs and slaughtered one day after weaning the lambs; EWL = ewes which remained in lactation for 60 days with their respective lambs and a further period of approximately 30 days without their lambs and, afterwards, slaughtered; and ENP = ewes that remained in feedlot for 60 days and did give birth during the year. No difference was observed between rearing systems in most of the characteristics measured in vivo and in the carcass. The croup perimeter determined in the carcass and the thoracic perimeter and chest and croup width obtained in vivo were highly correlated to the body and cold carcass weights of the ewes in this study. Therefore, these measurements can assist in determining the body weight of ewes at different physiological stages.

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“…Scientists have achieved tremendous successes in phenotypic characterization study of growth-development production performance and genetic characteristics for sheep (Aziz and Sharaby 1993;Janssens and Vandepitte 2004;Zhou 2013;Zishiri et al 2013). Various studies showed that the body dimensions of sheep can be used to study the interactions between heredity and environment (Dunlop and Young 1966), to assess the growth rate, feed utilization, carcass characteristics in farm animals (Wynn and Thwaites 1981) and to predict the live body weight based on the body measurements (Aziz and Sharaby 1993;Mohammed and Amin 1997;Varade and Ali 1999;Atta and Khidir 2004). In addition, linear size measurements have been suggested as the more objective measures for body conformation of animals (Janssens and Vandepitte 2004).…”

Section: Introductionmentioning

confidence: 99%

Development and validation of a visual image analysis for monitoring the body size of sheep

Zhang

Xuan

et al. 2018

Journal of Applied Animal Research

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In china, there is a great variety of sheep production systems, from the most traditional grazing types, mixed (grazing/stabling) to the most technologically advanced facility sheep. Body size parameters can reflect its growth development, production performance and genetic characteristics. So, monitoring body size is very important. In view of the problems or limitations of the present manual measurement, using the tools of measuring stick, tape measure, etc., the sheep having to stand on a flat place with correct posture, a non-contact method for measuring body dimensions of small-tailed Han sheep based on machine vision has been proposed and discussed. This approach is based on a position limit apparatus, computer-assisted visual capture, an automatic foreground extraction algorithm and a measuring point detection algorithm. The measured body sizes include withers height, back height, rump height, body length, chest depth, chest width, abdominal width and rump width. This approach has been examined in a specific farm for a case study. The errors of more than 90% measurements for sheep body size are within 3%. The results indicate that the method based on visual image analysis is effective, and it is especially suitable for the sheep feeding in an intensive and largescale way.ARTICLE HISTORY

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Estimating body weight from morphometric measurements of Sahel (Borno White) goats

Cited by 40 publications

References 2 publications

The measurement of chest girth as an alternative to weight determination in the performance recording of meat sheep

The measurement of chest girth as an alternative to weight determination in the performance recording of meat sheep

Medidas biométricas obtidas in vivo e na carcaça de ovelhas de descarte em diferentes estágios fisiológicos

Development and validation of a visual image analysis for monitoring the body size of sheep

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