Predição do peso vivo a partir de medidas corporais em animais mestiços Holandês/Gir

Reis, Guilherme Lanna; Albuquerque, Fernando Henrique Melo Andrade Rodrigues de; Valente, Bruno D.; Martins, Gabrimar Araújo; Teodoro, R. L.; Ferreira, Melisane Regina Lima; Monteiro, João Bosco Neves; Silva, Martinho de Almeida e; Madalena, F. E.

doi:10.1590/s0103-84782008000300029

Cited by 29 publications

(39 citation statements)

References 2 publications

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“…This result is in agreement with the ones found by Costa Júnior et al (2006) and Reis et al (2008). This was already expected because of the high correlations between this measure and weight.…”

Section: Resultssupporting

confidence: 93%

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Effect of environmental factors on performance of purebred and crossbred Santa Inês lambs from birth to 154 days of age

Koritiaki¹,

Ribeiro²,

Mizubuti³

et al. 2013

R. Bras. Zootec.

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-The objectives of this study were to evaluate the environmental effects (age of dam at lambing, type of birth and sex of lamb) and genetic groups (Santa Inês and ½ Santa Inês) on weight and morphometric measurements (heart girth, body length and height) of lambs; to test linear and allometric regressions to predict the weight through the measurements; and to describe the type of growth of the measurements from weight. Weight and morphometric measurements were sampled from birth to 154 days of age, at every 14 days. For the evaluation of the environmental factors and to predict the regressions the data of birth, weaning and 154 days of age were used; and to determine the type of growth all the data collected were used. The lambs derived from younger (two-tooth) ewes recorded lower averages than the ones from eighttooth ewes for weight, heart girth and body length at birth and length at weaning. The animals born from single births presented higher average weight from birth to weaning, as well as of all the measurements from birth to 154 days of age than those from twin births. There was no difference between the genetic groups Santa Inês and ½ Santa Inês. The correlations between the weight and measurements were significant, and it was possible to predict the weight from the morphometric measurements through regressions. The type of weight gain with heart girth was isometric, while with length it was positive allometric, and with height it was negative allometric. Thereby, in the absence of a scale it is possible to predict the weight from the morphometric measurements, and the type of birth is the most important factor that affects the development of lambs from birth to weaning.

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Section: Resultssupporting

confidence: 93%

“…This means that equations using more than one body measurement are more efficient to estimate the live weight than equations using only one measurement, which agrees with results obtained by Reis et al (2008) and Sowand & Sobola (2008).…”

Section: Resultssupporting

confidence: 90%

Effect of environmental factors on performance of purebred and crossbred Santa Inês lambs from birth to 154 days of age

Koritiaki¹,

Ribeiro²,

Mizubuti³

et al. 2013

R. Bras. Zootec.

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show abstract

“…The multiple linear regressions (Table 8) showed better coefficients of determination than the simple linear regressions, meaning that equations using more than one morphometric measurement are more efficient to estimate live weight than equations using only one measurement, which agrees with results obtained by Reis et al (2008) and Sowand & Sobola (2008). In the same way of what was observed in the correlations, equations for prediction of weight at weaning are better when using morphometric data of weaning.…”

Section: Results and Discutionsupporting

confidence: 81%

Influence of environmental factors on ponderal performance and morphometric characteristics of lambs of different genetic groups from birth to weaning

Koritiaki¹,

Ribeiro²,

Mizubuti³

et al. 2013

R. Bras. Zootec.

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-The objectives of this work were to evaluate the environmental effects (age of dam, type of birth and sex of lamb) and genetic groups (Hampshire Down and Ile de France, ½ and ¾ Hampshire Down, Ile de France and Suffolk, and ½ Texel) on performance and morphometric characteristics (height, length and heart girth) of lambs; to test regressions to predict live weight of lambs from body measurements; and to describe the growth type of the measurements as function of the weight. Weights and measurements were collected from birth to weaning, every 14 days. For evaluations of performance in relation to environmental effects and genetic groups, only data from birth and from weaning were used; for type of growth all collected data were used. Lambs from younger ewes (2 teeth) presented smaller average for weight at birth, heart girth and height at weaning. Single-birth lambs presented greater averages than twins. Genetic group influenced all traits evaluated, except heart girth at birth and average heart girth gain. Means for birth weight were higher in ¾ Ile de France (3.93±0.16 kg) and lower in ½ Texel lambs (3.04±0.24 kg), and for weaning, they were higher in ½ Texel (14.86±0.87 kg) and lower in Ile de France lambs (11.66±0.83 kg). Year of birth influenced all traits. Heart girth and length showed a negative allometric growth in relation to weight, while between weight and height the relation was positive allometric. The factors that most influenced the performance of lambs from birth to weaning are the type of birth, genetic group and year of birth. Correlations between body weight and morphometric measurements are significant, so it is possible to predict one from the other.

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Section: Introductionmentioning

confidence: 99%

“…The main body measurements used to predict the weight of dairy cattle are: heart girth, wither height, hip width, body length and hip height with Equations proposed by Heinrichs et al (1992) and Reis et al (2008). Although there are some differences regarding the measures, greater accuracy and precision are obtained when more than one variable is considered in the model (Reis et al, 2008). Additionally, regression procedures used to obtain relationships between body weight and body measurements may be affected by the breed, age, body condition and physiological state of the animal (Heinrichs et al, 1992), which justifies the use of different prediction Equations for each heifer class.…”

Section: Introductionmentioning

confidence: 99%

<b>Evaluation of body weight prediction Equations in growing heifers

Franco

Marcondes

Campos

et al. 2017

Acta Sci. Anim. Sci.

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ABSTRACT. This study was realized to evaluate prediction models for body weight (BW) using body measurements as heart girth (HG), wither height (WH), hip width (HW), body length (BL) and hip height (HH), and develop new Equations to predict the BW of Holstein and crossbred heifers. Prediction Equations (1, 2, 3, 4, 5 and 6) proposed in previous studies were tested, while body measurements, which were more significant in terms of predicting BW, were used to obtain new Equations. Heart girth was the body measurement with the greater correlation with BW. Equation 4 presented the best prediction results, showing a low average deviation, high accuracy and precision. Equations 1 and 2 predicted with a high presence of bias, while 2 had the lowest value of the concordance correlation coefficient and a great contribution made by systematic error. The 3 model presented a high variability in predicting BW. For both Holstein and crossbred heifers, the Equations evaluated are inadequate for predicting BW. Among the Equations evaluated, the model using HG presented the best adjustment and the greater adjusted coefficient of determination. Body measurements relating to HG and BL were the most significant variables in predicting the BW, resulting in the following Equation: BW = -372.89 + 2.8072 × HG + 1.6087 × BL.

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Predição do peso vivo a partir de medidas corporais em animais mestiços Holandês/Gir

Cited by 29 publications

References 2 publications

Effect of environmental factors on performance of purebred and crossbred Santa Inês lambs from birth to 154 days of age

Effect of environmental factors on performance of purebred and crossbred Santa Inês lambs from birth to 154 days of age

Influence of environmental factors on ponderal performance and morphometric characteristics of lambs of different genetic groups from birth to weaning

<b>Evaluation of body weight prediction Equations in growing heifers

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