No abstract

The effect on ovulation, implantation and embryo survival of the time interval between parturition and mating was studied in 1 8 2 primiparous rabbits. The rabbits were mated either on day i (lot i) or on day 10 (lot 10 ) and killed on day 10 , 1 6, 20 , 24 or 2 8 post-coitus. The frequencies of ovulation and implantation were determined, the numbers of corpora lutea (C. L.)

l ï, quai de l'Industrie, .91260 ,%uvisy-suv-OvgeThe results are expressed as percentages after examination of 1 isg pigs and viscera, according to the age of the animals (birth, weaning, fattening, reproduction), the clinical criteria and lesions and according to the principal agents (parasites, germs, virus).The values of these percentages are not absolute, but they allow to determine the relative importance of the main diseases, to follow their evolution and to develop a more efficient prevention.

An intra venous injection or 1.1'. + intra tracheal injcction in swine might kill the animal when the amount of microorganisms is large. The disease is septicemic without any pulmonary localization. To " fix " Pasteazvella inside the lungs they should be damaged previously. P. Ull iltocida is well known as an " opportunist " invading the breached tissues. Therefore, we choosed the administration of embryonated Ascari.s suzinr eggs to 8 days before the trial. Ascaris + Pasteurella gi 1' cn by uzebulisatioza : (particle size I to 3 [1) the characteristics of the disease were : severe respiratory svmptoms with high hvperthermia,-polyarthritis (the septicemic facet of Pasteurella),-a loss in weight and an acute broncho pneumonia with an average death time of 5 days. Ascavis-+-Pasteaevella given by intra tracheal (and 1. 1'.) route: the same disease was obtained, but without polyarthritis. The acute broncho pneumonia was severe and death occurred 4 to 8 days after and was dose-related. Emphasis must be laid on the difficulty of reproducing in the laboratory a disease so commonly found in the field, as the purpose was to ol>tain a regular course and not a too early mortality.

A serological survey made in France reveals a rather large diffusion of the Parvovirus among pig herds. 45