Cluster analysis of breeding values for milk yield and lactation persistency in Guzerá cattle-Reference-Cited by-同舟云学术

Cluster analysis of breeding values for milk yield and lactation persistency in Guzerá cattle

Published:2016-07 Issue:7 Volume:46 Page:1281-1288
ISSN:0103-8478
Container-title:Ciência Rural
language:
Short-container-title:Cienc. Rural

Author:

Cruz Diego Augusto Campos da¹,Savegnago Rodrigo Pelicioni²,Santana Annaíza Braga Bignardi³,Peixoto Maria Gabriela Campolina Diniz⁴,Bruneli Frank Angelo Tomita⁴,Faro Lenira El⁵

Affiliation:

1. Instituto de Zotecnia/SAA, Brazil

2. Universidade Estadual Paulista "Júlio de Mesquita Filho", Brazil

3. Universidade Federal de Mato Grosso, Brazil

4. Embrapa Gado de Leite, Brazil

5. Instituto de Zootecnia/SAA, Brasil

Abstract

ABSTRACT: The aim of this study was to explore the pattern of genetic lactation curves of Guzerá cattle using cluster analysis. Test-day milk yields of 5,274 first-lactation Guzerá cows were recorded in a progeny test. A total of 34,193 monthly records were analyzed with a random regression animal model using Legendre polynomials to fit additive genetic and permanent environmental random effects and mean trends. Hierarchical and non-hierarchical cluster analyses were performed based on the EBVs for monthly test-day milk yield, peak yield, lactation persistency, and partial cumulative and 305-day yields. The heritability estimates for test-day milk yields ranged from 0.24 to 0.52. Cluster analysis identified animals in the population that belong to different groups according to milk production level and lactation persistency.

Publisher

FapUNIFESP (SciELO)

Subject

General Veterinary,Agronomy and Crop Science,Animal Science and Zoology

Link

http://www.scielo.br/pdf/cr/v46n7/1678-4596-cr-46-07-01281.pdf

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