periparturient

Dietary potassium does not negatively affect blood calcium in periparturient cows fed pasture.

From the third calving on, dairy cows are at risk of periparturient hypocalcaemia and paresis.

Mesenteric tear of the distal jejunum as a periparturient complication in a mare.

FEC were monitored at regular intervals during pregnancy and 4 times during the periparturient period.

An alternative to the gathering of ewes for these treatments is to provide anthelmintic incorporated in a feed or energy block during the periparturient period.

Even with the less than perfect timing, the supplements prevented both periparturient hypocalcaemia and paresis in cows of third parity or greater.

An exception to this rule occurs around the periparturient period when immunity wanes, particularly in heifers, and there are reports of clinical disease following calving.

Immunity to Trichostrongylus as in Ostertagia is slowly acquired and in sheep and probably goats it wanes during the periparturient period.

Letter to the Editor: Comment on the paper "Effects of space allocation and temperature on periparturient maternal behaviours, steroid concentrations, and piglet growth rates".

The source of the periparturient rise (PPR) is three-fold:(i) Maturation of larvae arrested due to host immunity.

These larvae are derived mainly from eggs passed in the faeces of ewes during the periparturient period, from about two weeks prior to lambing until six weeks post-lambing (Fig. 13).

(i) The PPR (periparturient rise in faecal egg counts) is very marked in ewes and is the most important cause of pasture contamination with nematode eggs in the spring.

Two phenomena which affect the norma parasitic life cycle of nematodes and which are of considerable biological and epidemiological importance are arrested larval development and the periparturient rise in faecal egg counts.

Examination of the febrile response to pyrogen in both the periparturient animal and the neonate indicates that an elevation in plasma levels of AVP is closely correlated with the diminution in the febrile response.

At present there is little evidence for a periparturient rise in faecal egg output in breeding mares due to a relaxation of immunity since the egg rise in the spring occurs in both breeding and non-breeding animals and is often unrelated to parturition.

The use of open flocks with unknown Q fever status should be avoided. These Guidelines for Biomedical Facilities using sheeps as research animals are intended to specifically address the task of containing pregnant and periparturient research animals where the occupational hazard is well documented.