Search Results

You are looking at 1 - 3 of 3 items for

  • Author: M. H. El JACK x
  • User-accessible content x
Clear All Modify Search
Free access

M. H. El JACK and A. H. SYKES

Summary.

The effects of compound I.C.I. 33828, a substituted dithiocarbamoylhydrazine, on fertility in the male domestic fowl have been studied. The daily introduction of the compound directly into the crop resulted in a gradual reduction in semen volume and fertility and after 2 or 3 weeks, depending on the dose, fertility dropped to zero. Seven days after giving medium and high dosages of the compound, watery droppings, loss of appetite, loss of body weight and weakness of the legs were observed in the treated cocks. All the effects were reversible since on withdrawal of the compound full recovery and normal fertility were achieved.

Free access

M. H. EL JACK and P. E. LAKE

During an investigation of the chemical composition of fowl semen it was felt necessary to study the effect of varying the length of rest periods between ejaculations on the quality of fowl spermatozoa. Such information could be useful for future work on the storage of semen in vitro for long periods, since there might be an optimum ejaculation rate for obtaining spermatozoa of the best quality and thus likely to survive best in vitro.

Twenty related males of the Breeding Line of Brown Leghorns at the Poultry Research Centre, Edinburgh (Blyth, 1954) were selected randomly from roosters trained for the artificial collection of semen. Semen had been collected and examined at least once weekly from all the males for a month before the start of the experiment. The males were subdivided randomly into five

Free access

M. H. EL JACK and P. E. LAKE

Summary.

A method was devised to collect uncontaminated fluid from the uterus (shell gland) of the laying, domestic fowl at two different stages of formation of the egg in the organ.

There was a marked difference between the composition of the uterine fluid found during the early stages of egg formation in the uterus and that found within about 2hr of oviposition. The concentration of sodium fell from 139·1 to 42·8 m-moles/1, whilst that of potassium rose from 15·9 to 75 m-moles/1, at oviposition. The amounts of calcium and magnesium were found to be higher around the time of egg laying and was most probably associated with the deposition of egg shell.

The significance of changes in the ionic composition of uterine fluid to the storage and movement of spermatozoa in the oviduct of the hen has been discussed.