Comparison of mathematical models to estimate live weight through heart girth in growing Pelibuey sheep

IF 0.2 4区农林科学 Q4 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Revista Colombiana De Ciencias Pecuarias Pub Date : 2022-07-28 DOI:10.17533/udea.rccp.v36n2a4

J. Canul-Solís, R. Portillo-Salgado, R. García-Herrera, E. Castillo-Gallegos, L. Castillo-Sanchez, E. Camacho-Pérez, A. Chaves-Gurgel, Carolina Marques-Costa, Patrick Bezerra-Fernandes, A. Chay-Canul

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引用次数: 2

Abstract

38 Background: In traditional sheep production systems, the assessment of animal growth 39 based on live weight (LW) is limited by the high cost of livestock scales as well as the 40 sophisticated maintenance required. Objective: To develop and evaluate equations to 41 predict LW using heart girth (HG) in growing Pelibuey sheep. Methods: A dataset 42 (n=415) of clinically healthy male Pelibuey sheep from two months to one year of age, 43 with an average LW of 25.96 ± 10.25 kg and HG of 68.31 ± 10.53 cm, were used. Three 44 equations were evaluated: LW (kg) = −37.70 + 0.93 × HG (Eq. 1); LW (kg) = −1.74 + 45 0.19 × HG + 0.008 × HG 2 (Eq. 2); and LW (kg) = 0.003 × HG 2.68 (Eq. 3). Results: The 46 correlation coefficient between LW and HG was r = 0.94 (p<0.001). The three equations 47 showed a high concordance correlation coefficient (CCCs≥0.97). However, the random 48 error was the main component of the mean square partition of the prediction error 49 (≥82.78%) only for Eqs. 1 and 2. The test for parameter identity (intercept=0; slope=1) 50 was accepted only for Eq. 2 (p>0.05). On the other hand, for Eqs. 1 and 3, the intercept 51 was different from zero and the slope was different from one (p<0.05). Conclusions: The 52 second-degree equations accurately and precisely estimated the body weight of growing 53 Pelibuey sheep using the HG as a sole predictor variable.

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通过心脏周长估算生长中的佩利布伊羊活重的数学模型比较

背景:在传统的绵羊生产系统中，基于活重(LW)的动物生长评估受到牲畜秤的高成本以及所需的复杂维护的限制。目的:建立并评价用心脏周长(HG)预测生长期佩利布伊羊LW的方程。方法:选取42只2月龄~ 1岁临床健康雄性Pelibuey羊(n=415)，其中43只平均LW为25.96±10.25 kg, HG为68.31±10.53 cm。评估了3个44方程:LW (kg) =−37.70 + 0.93 × HG (Eq. 1);LW (kg) = - 1.74 + 45 0.19 × HG + 0.008 × HG 2 (Eq. 2);LW (kg) = 0.003 × HG 2.68 (Eq. 3)。结果:LW与HG的46相关系数r = 0.94 (p0.05)。另一方面，等式1和等式3的截距51不等于0，斜率也不等于1 (p<0.05)。结论:52个二阶方程以HG为唯一预测变量，准确、准确地估计了53只Pelibuey羊的生长体重。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Revista Colombiana De Ciencias Pecuarias AGRICULTURE, DAIRY & ANIMAL SCIENCE-

CiteScore

0.80

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： The editors of Revista Colombiana de Ciencias Pecuarias (RCCP) welcome the submission of original manuscripts on experimental and clinical studies associated with the broad areas of animal sciences and veterinary medicine as they interface with biochemistry, molecular biology, physiology, pharmacology, toxicology, pathology, microbiology, parasitology, immunology and epidemiology. The scope of the journal includes studies of basic and applied research in animal management and production, feeding and nutrition, reproduction, breeding, genetics, animal welfare and behavior; as well as animal production focussed from biotechnology, soil science, agrostology, silvopastoral systems, livestock economics and the environment. The criteria for acceptance of papers submitted for publication are originality, quality and clarity of the content. Each contribution must be based on original, unpublished research that has not been simultaneously submitted to other journals. All papers will be peer reviewed. All authors bear responsibility for ensuring the integrity and quality of their reported research. It is the author''s responsibility to secure permission to use figures or tables that have been published elsewhere. Contributions may be classified as original research, review, rapid communication, clinical case studies or methodological articles, as well as news/commentaries or letters to the editor. Most review articles are invited by the editor. Authors interested in submitting a review article should contact the corresponding editor. Rapid publication of original manuscripts is a goal of the journal. Manuscripts must be written in English. Each manuscript is considered for publication with the understanding that it has not been simultaneously submitted to any other journal. Upon acceptance for publication, papers are subject to editorial review and revision.