BACKGROUND Aedes aegypti Linnaeus is a peridomestic mosquito that lays desiccation-resistant eggs in water-filled human-made containers. Previous investigations connected egg hatching with declining dissolved oxygen (DO) that is associated with bacterial growth. However, past studies failed to uncouple DO from other potential stimulatory factors and they contained little quantitative informatio...

Oxidative stress plays a crucial role in the laying stage which is a critical period for chick survival. We investigated the relationship of neonatal chick performance, brain antioxidant status and vitamin E supplementation level in hens. Starting at 17 weeks, hens were randomly divided into five groups. The control group received a basal diet without supplemental vitamin E (VE, dl-αtocopherol ...

The walleye pollock Gadus chalcogrammus is an important commercial species in Japan whose larvae and eggs may be negatively affected by the cold water mass from coastal Oyashio current that present spawning ground of Japanese Pacific stock this species. Therefore, we investigated egg larval specific density, mortality, behavioral response to temperature change during ontogenetic development und...

In the Atlas cedar forests located on northern massifs of Blidean and at eastern extension Saharan Atlas, 79 egg batches processionary moth Thaumetopoea pityocampa (Denis & Schiffermuller, 1775) were collected during summer period from two sites: Chrea National park (46), Ouled Yagoub forest (33). To assess effect characteristics parasitism, eggs monitored after hatching larvae and/or emerg...

A degree-day model was derived to predict egg hatch for Criconemella xenoplax. Eggs collected from gravid females were incubated in distilled water at constant temperatures of 10-35 C. Sixty-six percent of all eggs hatched between 13 and 32 C, and 42% hatched at 10 C. All eggs aborted above 32.5 C. Between 25 and 32 C, 8.5 +/- 0.5 days were required for egg hatch. Degree-day requirement for egg...

The main aim of this research was to estimate the genetic and phenotypic parameters for productive and reproductive traits of Esfahan native chickens. Traits included body weights at hatch (BW1), 8 weeks of age (BW8), 12 weeks of age (BW12), and at sexual maturity (WSM)], age at sex maturity (ASM), egg number (EN), average egg weight (AEW) in the first 12 weeks of production, and egg production...

The spawning of the muricid gastropod Plicopurpura pansa in the laboratory at 22-23 degrees C is described. Females deposited 1-20 capsules daily for at least 20 weeks, and produced up to 150 capsules each per spawning season. During spawning, egg clusters were formed consisting of hundreds of capsules of different ages deposited by different females. Each egg capsule contained an average of 43...

Double-yolked (DY) and single-yolked (SY) duck eggs (n = 1318 for both) were candled and weighed on Days (d) 2, 8, 12, 15, 19, 22 and 25 of incubation and yolk/embryo position was recorded on d2, d8 and at post-mortem. From d8 only eggs with live fertile yolk(s) remained in the incubator. On d2, 99.39% of yolks in DY eggs were in the adjacent position and by d8 yolk positions changed to paralle...

Amino acid (AA) and fatty (FA) composition of the fertilised eggs different larval stages (at 0, 3, 6, 9, 12, 15 and21 days post-hatch, dph) Chanos chanos was investigated. The total indispensable amino acids (IAA) contributed to55.62% AA in egg which reduced to 52.54% on 6 dph. profile C. found be rich invaline (7.99%), leucine (7.51%) lysine (6.98%) poor histidine (2.36%) methionine (2.47%), ...

The current study was done in the hatchery unit/ animal production department/ directorate of agricultural research Sulaimani province from 28 March – 7 May 2022. Three hundred (300) eggs were used to effect egg shape parameters on characteristics hatched chicks. Immediately after collecting eggs, weighted by using electronic balance (0.01 g) sensitive, and length Breadth for each measured digi...