An experiment was conducted to assess how hatching performance is affected by breeder age and egg holding environment during short-term storage. Response variables analyzed were egg weight loss up to 18 d of incubation, viability (hatchability of fertile eggs), embryonic mortality, hatching time, and weight of male and female chicks, at hatching and at the end of incubation. The trials involved...

The tadpole shrimp, Triops cancriformis, is a freshwater crustacean listed as endangered in the UK and Europe living in ephemeral pools. Populations are threatened by habitat destruction due to land development for agriculture and increased urbanisation. Despite this, there is a lack of efficient methods for discovering and monitoring populations. Established macroinvertebrate monitoring method...

Crocodilians are known to vocalize within the egg shortly before hatching [1,2]. Although a possible function of these calls - inducing hatching in siblings and stimulating the adult female to open the nest - has already been suggested, it has never been experimentally tested [1-5]. Here, we present the first experimental evidence that pre-hatching calls of Nile crocodile (Crocodylus niloticus)...

Background Haemonchus contortus, the causative agent of Haemonchosis, is the most economically important parasite in small ruminant production. Control with chemotherapy has not been successful due to rapid emergence of drug-resistant strains. There is a continuous search for alternative leads particularly from plants. The study aimed to evaluate the anthelmintic activity of crude methanolic ex...

This article explores the occurrence of hatching spines among bee taxa and how these structures enable a larva on hatching to extricate itself from the egg chorion. These spines, arranged in a linear sequence along the sides of the first instar just dorsal to the spiracles, have been observed and recorded in certain groups of solitary and cleptoparasitic bee taxa. After eclosion, the first inst...

Longidorus africanus multiplication on tomato was highest at 29 degrees C. Few nematodes were recovered after 6 weeks at soil temperatures of 35 degrees C or below 23 degrees C. The time to egg hatching was shortest and the percentage of eggs hatching was highest at 29 degrees C. The minimum temperature and the heat sum above this temperature required for egg development were calculated to be 1...

This study was designed to evaluate the effects of astaxanthin in broodfish diets on reproductive performance, egg quality and larvae parameters clownfish (Amphirion ocellaris). Five treatments were tested with 5 levels (Carophyll Pink 10% CWS) 0, 50, 100, 150 200 mg/kg added feed. Each treatment repeated triplicate supplemental feeding trials arranged for 13 months. The results showed that the...

Reduced reproductive success of birds nesting near power lines has been documented but never directly attributed to electromagnetic fields (EMFs). Laboratory studies have identified EMF effects on embryonic development, but reproductive success of wild birds is dependent on additional factors, including fertility, egg size, hatching, and fledging success. We tested whether EMFs affect reproduct...

In decapod crustaceans, the conditions experienced during embryonic development trigger phenotypic plasticity of larvae at hatching. The objective this study was to test effects temperature Palaemon serratus on hatching larvae. We incubated egg-bearing females from eggs laying four temperatures (10, 15, 18 and 20°C). Weight, carbon nitrogen contents were measured newly laid freshly hatched dura...