Frustration and production in purelines of chickens and their reciprocal crosses |
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| Affiliation: | 1. Department of Mathematics for Economics, University of Valencia, Avd. Tarongers S/N, 5 Valencia, Spain;2. Centro de Desarrollo Urbano Sustentable ANID/FONDAP/15110020, Av. Vicuña Mackenna 4860, Santiago, Chile;3. Departamento de Ingeniería Hidráulica y Ambiental, Pontificia Universidad Católica de Chile, Avda. Vicuña Mackenna, 4860 Santiago, Chile;4. Department of Business, New York College, Av. Vasilissis Amalias 38, 105 58, Athens, Greece;1. Sheffield School of Architecture, University of Sheffield, Sheffield, United Kingdom;2. Department of Architecture, University of Technology, Baghdad, Iraq;3. Department of Mechanical and Construction Engineering, Northumbria, University Newcastle, United Kingdom |
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| Abstract: | Frustration, fear and production traits were measured in four populations of White Plymouth Rock pullets that were maintained singly in wire cages. The populations consisted of two purelines and their reciprocal crosses. Significant differences were found between the purelines for frustration, as measured by head flicking. Means for the cross-line pullets were similar to that of the parental line with lower value, and significantly different from the parental line with the higher value. Highly significant differences were found among lines for fear, with the average of the reciprocal cross means being the same as the mid-parent average of the purelines. Within population, phenotypic correlations showed no relationship between frustration and fear. Also there was no evidence, under our husbandry conditions, that frustration and fear were associated with either body weight, age at first egg or egg production. |
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