Background With the advent of rapid industrialization, several chemicals are released in the air, water and soil. Chemical elements play a crucial role in male reproduction. Heavy metals exposure can adversely affect male fertility and result in severe impairment of testicular functions including germ cell death and inhibition of testicular steroidogenesis. The aim of this study was to investig...

Quantitative microscopic structure of testis in adult Arabian rams, raised under closed grazing system in Khuzestan province of Iran, was studied in four seasons over a one year period. For this purpose, thirty adult rams were randomly selected and the live weight and scrotal circumference of rams were recorded. At the beginning of each season, among the study group, four rams were randomly sel...

Leptin is secreted mainly by fat, which is involved in energy metabolism and reproduction. Leptin and itsreceptor (Ob-R) have been detected in human spermatozoa and testis, thus it can be concluded leptin involves in male physiology. The goal of this study was determination of the presence of leptin receptor mRNA in the ram testis, epididymis and spermatozoa by reverse transcription polymerase ...

leptin is secreted mainly by fat, which is involved in energy metabolism and reproduction. leptin and itsreceptor (ob-r) have been detected in human spermatozoa and testis, thus it can be concluded leptin involves in male physiology. the goal of this study was determination of the presence of leptin receptor mrna in the ram testis, epididymis and spermatozoa by reverse transcription polymerase ...

The seasonality of breeding activity in sheep represents an important constraint in the breeding program of commercial flocks. The ‘ram effect’ is one among various techniques available to manipulate reproduction during the anoestrous season but with the advantages of being inexpensive, of easy application and free from causing problems to the consumer of animal foods (i.e. hormone residues). T...

using melatoninin ewes of iran black breed, this study aimed to compare the reproduction and production performances in lambing program of two and three times per years for duration of two years. a hundred ewes allocated to two parallel groups: group a (ewes in three lambing managing system using melatonin) and group b (ewes in two lambing managing system without using melatonin). to induce the...

Epidermal growth factor (EGF) is one of the important cytokines that play a role in fertility. It is known that EGF affects both male and female reproduction, but its effect on sperm parameters is not fully understood. Up to the present, the effect of EGF on ram sperm motility parameters has not been published. We analyzed motility parameters of ejaculates after 24, 48, and 72 hours from the EG...

HAPTEN-RADIOIMMUNOASSAY: A GENERAL PROCEDURE FOR THE ESTIMATION OF STEROIDAL AND OTHER HAPTENIC SUBSTANCES A. Rees Midgley, Jr., G.D. Niswender, and J. Sri Ram from Reproduction and Endocrinology Program Department of Pathology University of Michigan Ann Arbor, Michigan 48104 and Laboratory of Experimental Pathology National Institute of Arthritis and Metabolic Diseases National Institutes of H...

Abstract Antioxidants are natural or synthetic substances that delay oxidation through one more mechanisms, such as scavenging free radicals, inhibiting lipid peroxidation, and complexing with metals, tissue destruction via oxidation. commonly used in animal feed the food industry to prevent of animal-origin products. Moreover, oxidants increasingly reproduction, especially for semen preservati...