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Factorial and discriminant analysis on non-carcass components of Berganês lambs from different sexual classes and crossbreeding

Published online by Cambridge University Press:  04 August 2021

José Renaldo Vilar da Silva Filho*
Affiliation:
Centro de Ciências Agrárias, Universidade do Federal do Vale do São Francisco, Petrolina, PE 56300-990, Brazil
João Bandeira de Moura Neto
Affiliation:
Departamento de Zootecnia, Universidade Federal Rural de Pernambuco, Recife, PE 52171-900, Brazil
Lays Thayse Alves dos Santos
Affiliation:
Centro de Ciências Agrárias, Universidade do Federal do Vale do São Francisco, Petrolina, PE 56300-990, Brazil
Clebson Oliveira Ferreira
Affiliation:
Centro de Ciências Agrárias, Universidade do Federal do Vale do São Francisco, Petrolina, PE 56300-990, Brazil
Rafael Torres de Souza Rodrigues
Affiliation:
Centro de Ciências Agrárias, Universidade do Federal do Vale do São Francisco, Petrolina, PE 56300-990, Brazil
Janaina Kelli Gomes Arandas
Affiliation:
Departamento de Zootecnia, Universidade Federal Rural de Pernambuco, Recife, PE 52171-900, Brazil Scholarship of the Fundação de Apoio à Pesquisa do Estado de Pernambuco, FACEPE, Recife, PE 50720-001, Brazil
Maria Norma Ribeiro
Affiliation:
Departamento de Zootecnia, Universidade Federal Rural de Pernambuco, Recife, PE 52171-900, Brazil Scholarship of the Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq, Brasília, Brazil
Tadeu Vinhas Voltolini
Affiliation:
Embrapa Semiárido, Petrolina, PE 56302-970, Brazil
*
Author for correspondence: José Renaldo Vilar da Silva Filho, E-mail: renaldovilar.zootecnia@gmail.com

Abstract

The aim of this study was to evaluate the non-carcass components (NCC) of Berganês ecotype lambs of different sexual classes and genotypes using univariate and multivariate statistics, carrying out two experimental trials. In order to evaluate the effects of the sexual class, non-castrated males (BNC), castrated males (BC) and females (BF) of Berganês ecotype lambs were used, with mean initial body weight of 27 ± 3.1 kg. To evaluate crossbreeding, non-castrated male lambs of the genotypes Berganês (BG), Berganês × Santa Inês (BSI) and Berganês × Dorper (BD) were used, as well as the control Dorper × Santa Inês (DSI), all with mean initial body weight of 28 ± 3.8 kg. The weight and yield of the total by-products was higher for BNC. Regarding the genotype, BSI showed higher weight and yield of internal fat, but the weight and yield of the total by-products was higher for BG and BD. In factorial analysis (FA), the NCC, more correlated with empty body weight (EBW) and total weight gain (TWG), showed higher eigenvectors for factor 1. For factor 2, the weights and yields of internal fat and total viscera obtained higher eigenvectors. The discriminant analysis (DA) classified 100% of individuals in their respective sexes and genotypes. Therefore, the FA indicated that, among the NCC evaluated, the weights of liver, kidneys, GIT, skin and feets are determinant for obtaining EBW and TWG. The classification achieved by the DA indicates that the sexual classes and genotypes are heterogeneous.

Type
Animal Research Paper
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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