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Ernst K.F. Fröhlich
University of Bern
24Publications
11H-index
357Citations
Publications 24
Newest
#2Andreas PfulgH-Index: 1
Last.Michael Hubert Stoffel (University of Bern)H-Index: 17
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Keel bone damage is a wide-spread welfare problem in laying hens. It is unclear so far whether bone quality relates to keel bone damage. The goal of the present study was to detect possible associations between keel bone damage and bone properties of intact and damaged keel bones and of tibias in end-of-lay hens raised in loose housing systems. Bones were palpated and examined by peripheral quantitative computer tomography (PQCT), a three-point bending test, and analyses of bone ash. Contrary to...
3 CitationsSource
#1Ariane Stratmann (University of Bern)H-Index: 5
Last.Michael J. Toscano (University of Bern)H-Index: 18
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The prevalence of keel bone damage as well as external egg parameters of 2 pure lines divergently selected for high (H) and low (L) bone strength were investigated in 2 aviary systems under commercial conditions. A standard LSL hybrid was used as a reference group. Birds were kept mixed per genetic line (77 hens of the H and L line and 201 or 206 hens of the LSL line, respectively, per pen) in 8 pens of 2 aviary systems differing in design. Keel bone status and body mass of 20 focal hens per lin...
11 CitationsSource
Numerous studies have demonstrated influences of hybrid, feed, and housing on prevalence of keel bone fractures, but influences of behavior and production on an individual level are less known. In this longitudinal study, 80 white and brown laying hens were regularly checked for keel bone deviations and fractures while egg production was individually monitored using Radio Frequency Identification (RFID) from production until depopulation at 65 weeks of age. These focal birds were kept in eight p...
12 CitationsSource
#1Nadine Ringgenberg (University of Bern)H-Index: 3
Last.Beatrice A. RothH-Index: 9
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Laying hens in loose-housing systems select a nest daily in which to lay their eggs among many identical looking nests, they often prefer corner nests. We investigated whether heterogeneity in nest curtain appearance – via colours and symbols – would influence nest selection and result in an even distribution of eggs among nests. We studied pre-laying behaviour in groups of 30 LSL hens across two consecutive trials with eight groups per trial. Half of the groups had access to six identical rolla...
9 CitationsSource
#1Nadine Ringgenberg (University of Bern)H-Index: 3
Last.Beatrice A. RothH-Index: 9
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Nest choice in loose-housed laying hens is influenced by nest characteristics, position and social factors. We examined the relative preference of laying hens for two group-nests differing in the presence or absence of a partition in the middle of the nest and whether this was influenced by social status. We hypothesized that hens would prefer the partitioned nest as it provides more enclosure, and that social status would affect nest choice. Relative preference for the nests was assessed in a f...
10 CitationsSource
#1Ariane Stratmann (University of Bern)H-Index: 5
Last.Michael J. Toscano (University of Bern)H-Index: 18
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Non-cage housing systems for laying hens such as aviaries provide greater freedom to perform species-specific behavior and thus are thought to improve welfare of the birds; however, aviaries are associated with a high prevalence of keel bone damage (fractures and deviations), which is a major welfare problem in commercial laying hens. Potential causes of keel bone damage are falls and collisions with internal housing structures that occur as birds move between tiers or perches in the aviary. The...
43 CitationsSource
#1Ariane StratmannH-Index: 5
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Keel bone fractures and deviations are one of the major welfare and health issues in commercial laying hens. In non-cage housing systems like aviaries, falls and collisions with perches and other parts of the housing system are assumed to be one of the main causes for the high incidence of keel bone damage. The objectives of this study were to investigate the effectiveness of a soft perch material to reduce keel bone fractures and deviations in white (Dekalb White) and brown laying hens (ISA Bro...
33 CitationsSource
#1T. L. LentferH-Index: 2
#2H. PendlH-Index: 1
Last.E. von Borell (MLU: Martin Luther University of Halle-Wittenberg)H-Index: 15
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Abstract Measuring the ratio of heterophils and lymphocytes (H/L) in response to different stressors is a standard tool for assessing long-term stress in laying hens but detailed information on the reliability of measurements, measurement techniques and methods, and absolute cell counts is often lacking.Laying hens offered different sites of the nest boxes at different ages were compared in a two-treatment crossover experiment to provide detailed information on the procedure for measuring and th...
12 CitationsSource
Last.Michael ZähnerH-Index: 3
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In a laboratory test of a low-frequency RFID system the probability of registration was assessed and this system was used to study ranging behavior of laying hens. To test the equipment, tags with various orientations on a platform were moved with varying speeds across a different number of antennas. The probability of registration declined when the speed of tags was greater than 1.5 m/s. In the field test on 12 farms antennas were placed on both sides of every pophole and tags were attached to ...
3 CitationsSource
#1Nadine Ringgenberg (University of Bern)H-Index: 3
Last.Beatrice A. RothH-Index: 9
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Abstract Laying hens in loose housing systems have access to group-nests which provide space for several hens at a time to lay their eggs. They are thus rather large and the trend in the industry is to further increase the size of these nests. Though practicality is important for the producer, group-nests should also cater to the egg-laying behaviour of hens to promote good welfare. One of the factors playing a role in the attractiveness of a nest is the amount of enclosure: hens prefer more enc...
15 CitationsSource
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