Results 1 to 10 of about 100,197 (349)

Progesterone in the Blood of the Laying Hen [PDF]

Nature, 1958
FRAPS et al. 1, using the bioassay method of Hooker and Forbes2, reported progestational activity in the peripheral blood of the hen. Layne et al. 3, using chromatographic procedures, failed to find progesterone in chicken blood although they did identify this substance in extracts of ovarian tissue. In preliminary studies in this laboratory4, chemical
Ivan M. Lytle, F.W. Lorenz
openalex   +4 more sources

Bioavailability of Tryptophan Biomass for Laying Hens. [PDF]

Animals (Basel)
Two concurrent assays were conducted with the objective of evaluating the bioequivalence and determining the relative bioavailability value (RBV) of L-tryptophan biomass 60% for laying hens. In both assays, L-tryptophan 98% was used as the reference source. A total of 216 hens were used in the two assays.
Estevão SCO, da Silva GHN, Oliveira LRR, Dos Santos LO, Raimundo EKM, Vieira RB, Rodrigues TA, Nogueira BRF, da Silva EA, Amoroso L, Lima MB, Silva EPD.   +11 more
europepmc   +4 more sources

Iron metabolism in the laying hen [PDF]

Biochemical Journal, 1954
W. N. M. Ramsay, Elizabeth A. Campbell
openalex   +4 more sources

Effects of Dietary Yellow Mealworm (Tenebrio Molitor) supplementation on meat and structural egg quality of different aged-laying hens [PDF]

Poultry Science
Global poultry production faces dual pressures of sustainable protein scarcity and age-specific nutritional demands. Tenebrio molitor (TM) emerges as an eco-friendly alternative protein source, yet its differential effects across laying hen life stages ...
Zhilong Lan, Gaixia Qiao, Xulei Ni, Qixin Yan, Ke Li, Minjie Zhang, Xinyi Liu, Liu Liu, Chune Zhang, Xinbao Liu, Ying Luo   +10 more
doaj   +2 more sources

Transcriptomic analysis of the liver, jejunum, and uterus in different production stages of laying hens [PDF]

Poultry Science
Egg production in laying hens is related to very complex and elaborate processes involving the cooperation of various tissues. Laying hens undergo this complicated production process in different production stages during overall laying periods.
Gi Ppeum Han, Byeonghwi Lim, Jun-Mo Kim, Deok Yun Kim, Hyun Woo Kim, Dong Yong Kil   +5 more
doaj   +2 more sources

Welfare of laying hens on farm [PDF]

EFSA Journal, 2023
This scientific opinion focuses on the welfare of laying hens, pullets and layer breeders on farm. The most relevant husbandry systems used in Europe are described. For each system, highly relevant welfare consequences were identified, as well as related animal-based measures (ABMs), and hazards leading to the welfare consequences.
EFSA Panel on Animal Health and Animal Welfare,, Nielsen, Søren Saxmose, Alvarez, Julio, Bicout, Dominique Joseph, Calistri, Paolo, Canali, Elisabetta, Drewe, Julian Ashley, Garin-Bastuji, Bruno, Gonzales Rojas, Jose Luis, Gortázar Schmidt, Christian, Herskin, Mette, Miranda Chueca, Miguel Ángel, Padalino, Barbara, Pasquali, Paolo, Roberts, Helen Clare, Spoolder, Hans, Stahl, Karl, Velarde, Antonio, Viltrop, Arvo, Winckler, Christoph, Estevez, Inmaculada, Guinebretière, Maryse, Rodenburg, Bas, Schrader, Lars, Tiemann, Inga, Van Niekerk, Thea, Ardizzone, Michele, Ashe, Sean, Hempen, Michaela, Mosbach-Schulz, Olaf, Rojo Gimeno, Cristina, Van der Stede, Yves, Vitali, Marika, Michel, Virginie   +33 more
openaire   +8 more sources

The impacts of fermented feed on laying performance, egg quality, immune function, intestinal morphology and microbiota of laying hens in the late laying cycle

Animal, 2022
Fermented feed has the potential to improve poultry gastrointestinal microecological environment, health condition and production performance. Thus, the present study was undertaken to explore the effects of fermented feed on the laying performance, egg ...
Wei Guo, Li-na Xu, Xiao-jun Guo, Wei Wang, Qing-hong Hao, Shi-ying Wang, Bao-cheng Zhu   +6 more
doaj   +1 more source

The Effect of Low Temperature on Laying Performance and Physiological Stress Responses in Laying Hens

Animals, 2023
The present study investigated the effect of low temperature on laying performance, egg quality, body temperature, yolk malondialdehyde, yolk corticosterone, and serum biochemistry in laying hens.
Da-Hye Kim, Ju-Yong Song, Jina Park, Byung-Yeon Kwon, Kyung-Woo Lee   +4 more
doaj   +1 more source

The Ethics of Laying Hen Genetics [PDF]

Journal of Agricultural and Environmental Ethics, 2019
AbstractDespite societal concerns about the welfare of commercial laying hens, little attention has been paid to the welfare implications of the choices made by the genetics companies involved with their breeding. These choices regarding trait selection and other aspects of breeding significantly affect living conditions for the more than 7 billion ...
Mia Fernyhough, Christine J. Nicol, Teun van de Braak, Michael J. Toscano, Morten Tønnessen   +4 more
openaire   +5 more sources

Analysis of excreta bacterial community after forced molting in aged laying hens [PDF]

Asian-Australasian Journal of Animal Sciences, 2019
Objective As laying hens become aged, laying performance and egg quality are generally impaired. One of the practical methods to rejuvenate production and egg quality of aged laying hens with decreasing productivity is a forced molting.
Gi Ppeum Han, Kyu-Chan Lee, Hwan Ku Kang, Han Na Oh, Woo Jun Sul, Dong Yong Kil   +5 more
doaj   +1 more source