The objective of this study was to evaluate effect of different concentrations of catalase in two extenders on motility, viability and lipid peroxidation bull spermatozoa during semen freezing process. Thirty ejaculates collected from ten Holstein bulls were pooled and evaluated at 37 °C. Pool ejaculated was split into two main experimental groups, 1 and 2. In experiment 1, specimen was diluted...

Many birds initiate incubation before clutch completion, which results in asynchronous hatching. The ensuing within-brood size disparity often places later-hatched nestlings at a developmental disadvantage, but the functional significance of the timing of the onset of incubation is poorly understood. Early incubation may serve to maintain the viability of early-laid eggs, which declines over ti...

1. Researches dealing with insect eggs are limited to hatchability, hatching conditions, elemental analysis and egg viability. Little is known about the influence of different elements on the insect eggs. 2. In the present study, the elemental analysis for two honey bee races was studied using energy dispersive X-ray spectroscopy. 3. Carbon, nitrogen, oxygen, magnesium, phosphorus, sulfur, calc...

objectives: this study was undertaken to evaluate the viability of periodontal ligament (pdl) cells of avulsed teeth in three different storage media. materials and methods: forty-five premolars extracted for orthodontic therapeutic purposes were randomly and equally divided into three groups based on storage media used [group i: milk (control); group ii: aloe vera (experimental); group iii: eg...

The objectives of this study were to investigate the effects of testis-epididymis cool storage on viability and progressive motility of buffalo epididymal sperm (EP) and to compare the influences of two basic semen extenders on post thaw EP viability and progressive motility. Abattoir collected buffalo testicles were allotted to three storage times (0 h: n = 10; 24 h: n = 10 and 48 h: n = 12). ...

Greenhouse tests were conducted to determine the persistence of nonviable Heterodera glycines eggs in soil. Laboratory and greenhouse tests were conducted to determine the usefulness of the vital stains acridine orange and tetrazolium red for differentiating viable and nonviable eggs of H. glycines. Nonviable (boiled) egg preparations were compared with preparations that were not boiled for the...

We used the BACTEC system to evaluate the effects of several decontamination methods and the addition of antibiotics on the viability of Mycobacterium ulcerans. The effects of polyoxyethylene stearate or egg yolk as supplements were also evaluated to determine their impact on the growth of M. ulcerans. Strains of different geographic origins were subjected to Petroff, reversed Petroff, oxalic a...

1. We tested experimentally the e€ects of exposure to high ambient temperatures, for periods of 1±9 days, on the viability of eggs of the green-rumped parrotlet. 2. The hatchability of 534 newly laid parrotlet eggs declined after exposure of 3 or more days. 3. The probability of hatching was not signi®cantly a€ected by the duration or proportion of time exposed to temperatures below physiologic...