Epizootiological monitoring studies on parasitoses of domestic ruminants indicate that one the most common causes nematodes digestive tract in large and small cattle are helminths genus Trichuris. Those develop directly – without intermediate hosts, their embryonic stages became invasive environment under favorable conditions. The eggs those parasites incredibly resistant can be infective for a...

The objective of this study was to identify the migration period of the genital tubercle and the period of visualization of external genital structures in fetuses of the Dorper breed of sheep derived from natural mating and from fresh, frozen and vitrified embryo transfer. Transrectal ultrasound was performed using a double-frequency linear transducer (6.0 and 8.0 MHz) to monitor 130 ewe fetuse...

HYDATID disease is due to the development in man, acting as an intermediate host, of the cystic larval form of a small tapeworm, Echinococcus granulosus, the normal habitat of which is the ileum of the dog. Ova from an infected dog are deposited with its faeces on the ground. By this means grass and vegetables are polluted with ova, and when eaten by sheep, cattle, goats or occasionally by man ...

Background: Since the sheep ‘Dolly’ was successfully cloned by somatic cell nuclear transfer (SCNT), the inefficiency of SCNT cloning and abnormality of cloned animals have been a focus of considerable controversy. Oocyte quality has been shown to contribute to poor somatic cloning and cell reprogramming efficiency with many factors affecting oocyte quality and developmental potential. It has b...

Rat embryos, explanted with their embryonic membranes during the early stages of organogenesis (H-l (H days gestation), were grown in culture in roller tubes. Yolk-sac antibody (sheep anti rat yolk-sac gamma globulin), known to be teratogenic when injected into pregnant rats, was added to the culture medium. At concentrations of 01 mg/ml or more the antibody caused gross retardation of growth a...

Immune cells play an integral role in affecting successful reproductive function. Indeed, disturbed or aberrant immune function has been identified as primary mechanisms behind infertility. In contrast to the extensive body of literature that exists for human and mouse, studies detailing the immunological interaction between the embryo and the maternal endometrium are quite few in cattle. Never...

In vitro embryo production has the potential to produce more offspring from genetically valuable animals than standard MOET as it is capable of avoiding most of the causes of failure in MOET (poor response to superovulation, poor fertilization and premature luteolysis). It also allows repeating collection in the donor animals more often and more times in their reproductive life. However, consis...