Results 71 to 80 of about 787,178 (288)

Indoor Concentration Distributions of Ammonia and Sulfur-Based Odorous Substances According to Types of Laying Hen Houses in South Korea

Atmosphere
In South Korea, environmental complaints related to livestock odors continue to increase, and various efforts are underway to overcome them. An objective of this study is to monitor indoor concentrations of ammonia and sulfur-based odorous substances ...
Ki-Youn Kim, Jung-Kon Kim
doaj   +1 more source

Response of three laying hen genotypes to two feed calcium levels

Czech Journal of Animal Science, 2019
The present study aimed to evaluate the effect of two dietary Ca levels (3.00% vs 3.50%) in three hen genotypes (ISA Brown, Bovans Brown and Moravia BSL) on their laying performance and quality of their eggs.
Mohamed Ketta, Eva Tumova, Darina Chodova   +2 more
doaj   +1 more source

Chicken white egg chemerin as a tool for genetic selection for egg weight and hen fertility

Frontiers in Physiology, 2022
Embryo mortality rate, which can reach up to 40% in avian species, is a major issue for breeding. It is therefore important to identify new embryo development biomarkers for genetic selection to improve reproductive performances.
Ophélie Bernardi, Ophélie Bernardi, Maxime Reverchon, Anthony Estienne, Yannick Baumard, Christelle Ramé, Adeline Brossaud, Yves Combarnous, Pascal Froment, Joëlle Dupont   +9 more
doaj   +1 more source

Laying hen husbandry: group size and use of hen-runs [PDF]

, 2000
With regard to welfare reasons, various label productions limit the number of laying hens allowed per flock.
Hirt, Helen, Hördegen, Philipp, Zeltner, Esther   +2 more
core  

Probiotic mediated intestinal microbiota and improved performance, egg quality and ovarian immune function of laying hens at different laying stage

Frontiers in Microbiology, 2023
In order to investigate the effects of dietary probiotics supplementation on laying performance, egg quality, serum hormone levels, immunity, antioxidant, and gut microbiota of layers at different laying stages, a total of 168 Tianfu green shell laying ...
Hengyong Xu, Yuxiang Lu, Dan Li, Chao Yan, Yurui Jiang, Zhiguo Hu, Zhipeng Zhang, Ranran Du, Xiaoling Zhao, Yao Zhang, Yaofu Tian, Qing Zhu, Yiping Liu, Yan Wang   +13 more
semanticscholar   +1 more source

Search for the ideal laying hen for organic and free range systems [PDF]

, 2011
Since 1960 the majority of commercial layers are housed in cages. Non-cage housing started to appear again from 1980 onwards and increases in importance. It is questionable if birds bred to perform in cages are also suited for free range housing.
Bestman, Monique, Galea, Fabien, Leenstra, Ferry, Maurer, Veronika, Reuvekamp, Berry, van Niekerk, Thea, van Sambeek, Frans, Zeltner, Esther   +7 more
core  

Drying, a practical technology for reduction of poultry litter (environmental) pollution: methods and their effects on important parameters

Poultry Science
: Poultry farming generates significant poultry litter (broiler litter and laying hen manure), posing environmental and human health risks. Heat treatment, particularly through drying, can mitigate these adverse effects.
Mehdi Khodadadi, Aminolah Masoumi, Morteza Sadeghi   +2 more
doaj   +1 more source

PRODUCTIVITY OF LAYING HENS AN INDUSTRIAL HERD DEPENDING ON DENSITY OF THE MAINTENANCE IN CAGES OF MULTILEVEL BATTERIES

Тваринництво та технології харчових продуктів, 2020
According to the current norms (DSTD-AIC-04.05.) the density of keeping chickens in cages should be 22–25 hens/m2 , which corresponds to their provision with an area in the range of 400–450 cm2 /hen.
M. Sakhatsky, Yu. Osadcha, Vitalii Kuchmistov   +2 more
doaj   +1 more source

Effects of Observed Incubation Behavior on Egg Production in Laying Hens of a Commercial Chicken Breed and Detection of Single-Nucleotide Polymorphisms Associated with the Incubation Behavior

The Journal of Poultry Science, 2022
Upon contact with laid eggs, avians initiate incubation behavior and stop laying additional eggs. This phenomenon suggests that the productivity of laying hens in free-range facilities may decrease because of frequent contact with laid eggs.
Yuichiro Yonetani, Atsushi J. Nagano, Hideki Ueno, Tomoko Amano   +3 more
doaj   +1 more source

Laying hen movement in a commercial aviary: Enclosure to floor and back again.

Poultry Science, 2016
Many producers in the laying hen industry, including in North America, are phasing out conventional cages in response to consumer demands and sometimes subsequent legislation.
Dana L.M. Campbell, M. Makagon, J. Swanson, J. Siegford   +3 more
semanticscholar   +1 more source