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Integument, mortality, and skeletal strength in extended production cycles for laying hens - effects of genotype and dietary zinc source

Wall, Helena and Boyner, Malin and De Koning, Dirk-Jan and Kindmark, A. and McCormack, H. A. and Fleming, R. H. and Lopes Pinto, Fernando A and Tauson, Anne-Helene (2022). Integument, mortality, and skeletal strength in extended production cycles for laying hens - effects of genotype and dietary zinc source. British Poultry Science. 63 :2 , 115-124
[Research article]

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Abstract

1. This study on long-life layers, covering the period 20-100 weeks of age, investigated longitudinal effects on mortality, layer integument, and skeletal properties in Bovans White (BoW) and Lohmann Selected Leghorn Classic (LSL), with or without supplementation with dietary organic zinc (Zn). 2. Two experiments, using 1440 layers in furnished small group cages (FC) and 1836 layers in a traditional floor housing system (Floor), were run in parallel. Each replicate consisted of five adjacent cages containing eight hens in each FC, or a pen with 102 layers in the Floor group. 3. Mortality was recorded daily. Integument and keel bone condition were scored at 35, 55, 85, and 100 weeks of age on 20% of the layers. Tibial strength was recorded from 933 layers at 100 weeks. Statistical analyses were performed on replicate means, with four to five and nine replicates per combination of hybrid and diet in Floor and FC groups, respectively. 4. Cumulative mortality was 9.6% and 16.3% in FC and Floor, respectively, and increased in the latter part of the production cycle, particularly in the Floor group. 5. In FC, LSL had inferior feather cover, less keel bone deviation, and shorter claws than BoW. In Floor, LSL had superior feather cover, less severe vent wounds, more bumble foot, and cleaner plumage than BoW. In both production systems, claws grew longer and keel bone deviation became more severe with age. 6. In FC, layers fed organic Zn had lower body weight and less keel bone deviation at 100 weeks of age. 7. In conclusion, keel bone integrity, claw length, and mortality rate are potential threats to welfare in long-life layers. Feather pecking is a problem that needs addressing at an early stage in the production period. On the whole, organic Zn did not improve welfare conditions in long-life layers.

Authors/Creators:Wall, Helena and Boyner, Malin and De Koning, Dirk-Jan and Kindmark, A. and McCormack, H. A. and Fleming, R. H. and Lopes Pinto, Fernando A and Tauson, Anne-Helene
Title:Integument, mortality, and skeletal strength in extended production cycles for laying hens - effects of genotype and dietary zinc source
Series Name/Journal:British Poultry Science
Year of publishing :2022
Volume:63
Number:2
Page range:115-124
Number of Pages:10
Publisher:TAYLOR AND FRANCIS LTD
ISSN:0007-1668
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial-No Derivative Works 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 402 Animal and Dairy Science > Animal and Dairy Science.
Keywords:Feather cover, keel bone damage, bone strength, long life layer, organic zinc, hybrid
URN:NBN:urn:nbn:se:slu:epsilon-p-113676
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-113676
Additional ID:
Type of IDID
DOI10.1080/00071668.2021.1955329
Web of Science (WoS)000693903300001
ID Code:27457
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Animal Nutrition and Management
(VH) > Dept. of Animal Breeding and Genetics
Deposited By: SLUpub Connector
Deposited On:28 Mar 2022 11:54
Metadata Last Modified:28 Mar 2022 12:01

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