Results 51 to 60 of about 789 (197)

Temporal changes in the dietary niche of sympatric seals provides insight into the role of competition in population declines

Oikos, EarlyView.
Competition theory suggests that interspecific prey competition can result in changes to the dietary niche, but obtaining timeseries of data from sympatric species experiencing temporal variation in competition is challenging. Scotland is an important area for two species of seals, but over the past 20 years, populations of harbour seals Phoca vitulina
Izzy Langley, Philip S. Hammond, Paul M. Thompson, Graham J. Pierce, Lindsay J. Wilson, Ailsa J. Hall, Gordon D. Hastie, Debbie J. F. Russell   +7 more
wiley   +1 more source

The Effects of Forced Molt Treatment on Selected Steroids in Hens

Poultry Science, 1982
Abstract A study was conducted to determine the effects of an environmentally induced forced molt on concentrations of plasma progesterone (P), corticosteroids (CS), corticosterone binding globulin binding capacity (CBGBC), and liver corticosteroids (LCS) during early forced molt. Laying hens were placed into two environmental control chambers.
R P, Gildersleeve, D G, Satterlee, W A, Johnson, T R, Scott   +3 more
openaire   +2 more sources

Spraying drones: efficacy of integrating an avian repellent with drone hazing to elicit blackbird flock dispersal and abandonment of sunflower fields

Wildlife Biology, EarlyView.
Multiple management strategies exist to combat bird damage to agriculture. We explored combining two tools, drones as frightening devices and an avian repellent, to assess effectiveness of an integrated method to deter large flocks on complex landscapes. We evaluated the ability of a spraying drone (DJI Agras MG‐1P) deploying Avian Control (i.e. active
Jessica L. Duttenhefner, Timothy J. Greives, Page E. Klug   +2 more
wiley   +1 more source

Influence of the natural dyes bixin and curcumin in the shelf life of eggs from laying hens in the second production cycle - doi: 10.4025/actascianimsci.v34i2.12096

Acta Scientiarum: Animal Sciences, 2011
This study was developed to evaluate the effect of adding natural pigments on the storage of eggs from laying hens in the second production cycle submitted to diets based on corn and low-tannin sorghum.
Christine Laganá, Carla Cachoni Pizzolante, Patrícia Helena Nogueira Turco, José Evandro de Moraes, Érika Salgado Politi Braga Saldanha   +4 more
doaj   +1 more source

Using programmable infusion pump in avian species – a validation methodology in geese

Wildlife Biology, EarlyView.
Wildlife face anthropogenic and natural stressors that affect their physiology and behaviour. The activity of the hypothalamic–pituitary–adrenal axis and glucocorticoid (GC) production is intrinsically linked with energy regulation and environmental stressors.
Myriam Trottier‐Paquet, Maude Gauthier‐Bouchard, Akiko Kato, Charline Parenteau, Frédéric Angelier, Pierre Legagneux   +5 more
wiley   +1 more source

Cobalt and vitamin B12 in diets for commercial laying hens on the second cycle of production

Brazilian Journal of Poultry Science, 2003
The supplementation of cobalt and vitamin B12 in diets for commercial laying hens on the second production cycle was studied. Four hundred and eighty light commercial laying hens, Lohmann LSL, were used at initial phase of forced molting laying period ...
RK Kato, AG Bertechini, EJ Fassani, CD Santos, MA Dionizio, ET Fialho   +5 more
doaj   +1 more source

A Research on Egg Qualities of Early Age Force Molted Commerical Layer

Turkish Journal of Veterinary & Animal Sciences, 1997
The primary aim of this research is to investigate egg qualities of a commercial layer which was force molted as a result of depressed egg prices. Variations in some egg-shell quality measurements related to age and their interactions were also searched.
Savas, TÜRKER, ALTENLER, S, DUVENCIOGLU, H, AKSOY, T   +3 more
openaire   +4 more sources

Nesting ecology of an ice‐associated seabird, Kittlitz's murrelet, at the northern edge of its range

Wildlife Society Bulletin, EarlyView.
We studied the Kittlitz's murrelet, an ice‐associated seabird of conservation concern, at the northern edge of its range. Over a 2‐year period, we estimated nest density and success at 2 sites, captured and telemetered nesting murrelets, and tested the use of a thermal camera to improve nest detection.
Michelle L. Kissling, Molly C. McDevitt, Jonathan J. Felis, William Crisci, Zachary Pohlen, Ryan Ongtowasruk, Daniel L. Perret, Paul M. Lukacs, James A. Johnson, Metrona Mazonna   +9 more
wiley   +1 more source

Dietary Phosphorus Requirements of Force-Molted Leghorn Hens

Poultry Science, 1981
Abstract Two studies were conducted to determine the phosphorus requirements of force-molted Leghorn hens. In the first study, diets containing .8, .6, or .4% total phosphorus and 4% calcium were fed. In the second study diets with levels of .7, .6, .5, or .4% total phosphorus and 3.8% calcium were fed. Decreasing the phosphorus level improved shell
openaire   +1 more source

Calcitonin‐like diuretic hormone influences reproduction in adult female Rhodnius prolixus

Insect Science, EarlyView.
Highlights • CT/DH‐like immunoreactivity is present in female reproductive tissues • CT/DH receptor transcripts are expressed in the fat body and ovaries • RNAi knockdown of CT/DH receptors reduces egg number and hatching rate • Rhopr‐CT/DH increases RhoprVg1 and RhoprVgR expression in ovaries in vitro • Rhopr‐CT/DH stimulates oviduct contractions in a
Areej N. Al‐Dailami, Ian Orchard, Angela B. Lange   +2 more
wiley   +1 more source