Incidence of ovine perinatal mortality in New Zealand with particular reference to intrauterine infections

Hartley, W. J.; Boyes, Betty W.

doi:10.1080/00480169.1964.33543

Cited by 28 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Hartley & Marshall (1957), working at Wallaceville, made the initial discovery that Toxoplasma could cause perinatal mortality of lambs. Later, it was shown to be the most common infectious agent involved in abortions, stillbirths, and neonatal deaths in New Zealand sheep at that time (Hartley & Boyes 1964), though the incidence of bacterial infections was possibly underestimated. Similar observations of an association between Toxoplasma infection and ovine abortion were made in Britain (Beverley & Watson 1959,1961Beverley & Mackay 1962) and subsequently in many other countries (Dubey & Towle 1986;Dubey & Beattie 1988;.…”

Section: Toxoplasmosis In Animalsmentioning

confidence: 99%

Toxoplasmaand other protozoan infections of economic importance in New Zealand

Charleston

1994

New Zealand Journal of Zoology

View full text Add to dashboard Cite

Of the protozoans infecting domesticated animals and humans in New Zealand, it is undoubtedly the apicomplexans that are most important. These include Toxoplasma, Sarcocystis, Eimeria, Cryptosporidium, and Neospora species. All have the potential to cause both clinical disease in animals and subclinical losses of production and, in some industries, they necessitate the use of costly preventive measures. Some are also potentially important to human health and others to the acceptability of meat products. There have been very few attempts to estimate the economic significance of infections with these parasites in this country and it is difficult to do so. In this paper, I review the biology and prevalence of these infections in New Zealand, attempt to estimate the significance of at least some of them, and discuss the problems associated with doing so.

show abstract

Section: Toxoplasmosis In Animalsmentioning

confidence: 99%

Toxoplasmaand other protozoan infections of economic importance in New Zealand

Charleston

1994

New Zealand Journal of Zoology

View full text Add to dashboard Cite

show abstract

“…Na Austrália, Nova Zelândia e Inglaterra essas perdas variam entre 2% e 21% (Hartley & Boyes 1964, McFarlane 1965, Stamp 1967. No Uruguai 17% a 32% dos cordeiros nascidos anualmente morrem no período perinatal (Mari & McCosker 1975).…”

Section: Introdução Introdução Introdução Introdução Introduçãounclassified

Mortalidade perinatal de cordeiros no semi-árido da Paraíba

Nóbrega¹,

Riet-Correa²,

Nóbrega³

et al. 2005

Pesq. Vet. Bras.

View full text Add to dashboard Cite

The causes of perinatal lamb mortality were studied, from March 2002 to October 2004, on 27 farms in the semiarid region of Paraíba, northeastern Brazil. In 90 lambs necropsied the following frequency of different causes of death was found: neonatal infections (41.1%), malformations (23.3%), dystocia (10%), starvation/hypothermia (10%), abortion (4.4%), and predation (2.2%). Regarding the time of death, 4.4% of the lambs died before parturition, 10% during parturition, 30% on the first day after parturition, 20% between the second and the third day, and 35.6% between the 4th and the 28th day after parturition. The assistance during parturition, umbilical disinfection of the neonates, colostrum ingestion between 2 and 6 hours after parturition, and keeping the ewes in healthy environmental conditions during and after parturition could improve lamb surviving. The high frequency of malformations in different breeds suggests that malformations are due to a toxic plant. The main defects were permanent flexure of the front legs, brachygnathia, cleft palate, and other head malformations. In a recent report the authors demonstrated the teratogenic effects of Mimosa tenuiflora, a very common plant in the semiarid region, which is probably the cause of those malformations. Lambs which died due to starvation/hypothermia and had low birth weight (1.37 ± 0.70kg), suggesting that a better nutrition of the ewe during the last trimester of gestation is a way to control this cause of lamb mortality. Considering that in the northeastern region, in most farms, the rams stay with the ewes during the whole year, the adoption of a breeding season would help to control the different causes of perinatal lamb mortality.INDEX TERMS: Lamb mortality, newborn lambs, sheep production, perinatal mortality.

show abstract

“…titres. (October, 1964) Number of lambs , 1964, andSeptember, 1966, is contained in Table 4. Table 5 lists the relationship between D.T.…”

Section: Eioesmentioning

confidence: 99%

“…In sheep asymptomatic toxoplasmosis is very prevalent in the temperate zones and overt congenital infection is of considerable economic importance in some areas (Hartley and Boyes, 1964;Munday, 1970).…”

Section: Introdugtionmentioning

confidence: 99%