Data/hora: 11/06/2024 11:57:39

Provedor de dados: 	Acta Scientiarum: Animal Sciences	
País: 	Brazil	
Título: 	Evaluation of body weight prediction Equations in growing heifers	
Autores: 	Franco, Marcia de Oliveira; Marcondes, Marcos Inácio; Campos, José Maurício de Souza; Freitas, Denise Ribeiro de; Detmann, Edenio; Valadares Filho, Sebastião de Campos.	
Data: 	2017-04-03	
Ano: 	2017	
Palavras-chave: 	Zootecnia; Produção animal; Bovinocultura leiteira body measurements; Dairy heifers; Heart girth; Holsteins.	
Resumo: 	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. 	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/33118

10.4025/actascianimsci.v39i2.33118	
Editor: 	Editora da Universidade Estadual de Maringá	
Relação: 	http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/33118/pdf	
Formato: 	application/pdf	
Fonte: 	Acta Scientiarum. Animal Sciences; v. 39, n. 2 (2017); 201-206

Acta Scientiarum. Animal Sciences; v. 39, n. 2 (2017); 201-206

1807-8672

1806-2636	
Fonte: 	Direitos autorais 2017 Acta Scientiarum. Animal Sciences