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Relationship between rank order and productive parameters in Verata goats during milking

Published online by Cambridge University Press:  02 September 2010

D. Patón ,
L. Martín ,
M. Cereijo ,
A. Rota ,
A. Rojas  and
J. Tovar
L. Martín
Affiliation:
Facultad de Veterinaria (Production Animal), Universidad de Extremadura, Carretera de Trujillo s/n, 10071 Cáceres, Spain
M. Cereijo
Affiliation:
Facultad de Biología (Fisiología Animal), Universidad Autónoma de Madrid, Cantoblanco, 28009 Madrid, Spain
A. Rota
Affiliation:
Facultad de Veterinaria (Production Animal), Universidad de Extremadura, Carretera de Trujillo s/n, 10071 Cáceres, Spain
A. Rojas
Affiliation:
Facultad de Veterinaria (Production Animal), Universidad de Extremadura, Carretera de Trujillo s/n, 10071 Cáceres, Spain
J. Tovar
Affiliation:
Facultad de Veterinaria (Production Animal), Universidad de Extremadura, Carretera de Trujillo s/n, 10071 Cáceres, Spain
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Abstract

The hierarchic behaviour of 71 goats of the Verata breed from two independent flocks on two different farms (no.2 = 34 and no. 2 = 37) was studied during the milking-period of a year. Two statistical procedures: canonical correspondence analysis (CCA) and a log-linear model were used. In the CCA, the total frequencies of each goat in each of the 12 positions at the milking stalls during 210 days of lactation were computed as original variables. Canonical variables were the average values of dairy milk production, proportion of protein and proportion of fat. The first two CCA axes accounted for proportionately 0·72 of the variance. The first axis showed the effect of rank order (V1 = 0·45) and the second axis the variability between animals for the same group of hierarchy (V2 = 0·27). The first position (AC1, = 0·58; AC2 = 0·23) and the last position (AC1 = 0·11; AC2 = 0·26) of the milking stalls were in absolute contributions the most significant in the distribution of the four observed groups of hierarchy, as defined by their frequency of access to the first position. Two parameters were highly correlated with both axes: milk protein content (r1, = - 0·8; r2 = 0·9) and the day milk production (r1 = 0·6; r2 = 0·5). These results showed a direct relationship between rank order and milk production, whereas the variability in each group was best defined by the protein content. The log-linear model showed that goats of lactation numbers one, two and three have a similar behaviour with respect to their locations at the milking stalls, being distributed more randomly (â1, = 0·68 < â2 = 0·7 < â3 = 0·71) than goats of a lactation number four (â4 = 2·95). This effect could be a consequence of two different but related factors: either the animals develop a preference for a particular position over time, or that animals in their fourth lactation showed a more stable behaviour pattern which affected their body condition.

Keywords

behaviourcanonical analysisgoatsmilk productionrank order
Type
Research Article
Information
Animal Science , Volume 61 , Issue 3 , December 1995 , pp. 545 - 551
Copyright
Copyright © British Society of Animal Science 1995

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