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    Comparison of liver and bone health of two laying hen strains kept in different cage systems
    (Eugen Ulmer Gmbh Co, 2016) Onbasilar, Ebru E.; Erdem, E.; Unal, N.; Tunc, A. S.; Kocakaya, A.; Yaranoglu, B.
    Concerns have been increasing about conventional cages for laying hens in connection with welfare. Liver and bone disorders of laying hens are major problems. Therefore, the aim of this experiment was to investigate the differences in liver and bone traits of two laying strains kept in conventional and enriched cages. A total of 532 two Lohmann Brown Classic (LB) and 532 Lohmann LSL Classic (LW) hens were housed from 16 to 73 weeks in either conventional cages or enriched cages. Enriched cages had a nesting area, scratch pad, perch and claw shortener. At 73 weeks of age, blood parameters (alanine amino transferase (ALT), aspartate amino transferase (AST), alkaline phosphatase (ALP), calcium (Ca), phosphor (P), cholesterol and triglycerides), relative liver weight, fatty liver score and bone parameters (weight, length, diameter, maximum load, deformation at maximum load and stiffness of tibia and femur) were determined. The cage type affected only serum ALT, AST, ALP and cholesterol levels. Differences of liver and bone parameters between both cage types were not statistically significant. Serum ALT, ALP and P level and also weight and diameter of examined bones were affected by strain. This study indicates that cage type and cage type x strain interactions have limited effect on the liver and bone health.
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    Production performance, use of nest box, and external appearance of two strains of laying hens kept in conventional and enriched cages
    (Oxford Univ Press, 2015) Onbasilar, E. E.; Unal, N.; Erdem, E.; Kocakaya, A.; Yaranoglu, B.
    The aim of this study was to investigate the differences in production performance, use of nest box, and external appearance of 2 strains of laying hens kept in conventional and enriched cages. Lohmann Brown Classic (LB, n = 532) and Lohmann LSL Classic (LW, n = 532) hens were housed from 16 to 73 wk in either conventional cages or enriched cages. Enriched cages had a nesting area, scratch pad, perch, and nail shortener. Body weight (BW), hen-day egg production, egg weight, feed intake, feed conversion ratio (FCR), cracked and dirty eggs, use of nest box for lay, and external appearance were determined. Laying period influenced the hen-day egg production, egg weight, feed intake, and feed conversion ratio. Cage type affected the hen-day egg production and feed conversion ratio, while strain affected the egg weight, feed intake, and feed conversion ratio. Laying period x cage type and laying period x strain interactions affected egg production, egg weight, and feed conversion ratio. Both strains preferred to lay in the nest box. Percentages of cracked and dirty eggs of LW hens in enriched cages were higher than that in conventional cages. Most of the dirty eggs laid by both strains were found outside of the nest box. The LW hens laid more dirty eggs than the LB hens. Cage type and cage type x strain interaction were important for total feather score. Final claw length was affected by cage type, strain, and cage type x strain interaction. This study suggests that cage type, strain, and also cage type x strain and period x strain interactions should be considered when alternative housing systems are used.