Serum inoculation as a possibility for elimination of porcine reproductive and respiratory syndrome (PRRS) from a farrow-to-finish pig farm

Abstract

The large heterogeneity among porcine reproductive and respiratory syndrome virus (PRRSV) isolates is probably the main obstacle to its effective control using current commercial vaccines. Intentionally exposing all breeding pigs to PRRSV circulating on the farm could eliminate porcine reproductive and respiratory syndrome (PRRS) from the herd. The objective of this study was to eliminate PRRS from a farrow-to-finish pig farm by serum inoculation. The owner was acquainted with the strict biosecurity measures. Breeding pigs were immunised with serum, which was obtained from PRRSV-positive weaners from the same farm. The percent of antibody high positive breeding pigs decreased six months after serum inoculation, while 34 months after serum inoculation no more antibody high positive pigs were detected and 56.8% of breeding pigs and all other categories were free of antibodies. In the breeding herd no virus was detected during all testing while PRRSV circulated in 2-month-old weaners until 12 months after serum inoculation. Later all tested samples from weaners, growers and fatteners were negative. Herd closure and the adoption of strict biosecurity measures are essential. Serum inoculation of the breeding herd proved to be a successful measure for eliminating PRRS from this farrow-to-finish farm.

Association of the severity of lung lesions with carcass and meat quality in slaughter pigs

“…Over the last few decades, lung lesions have represented one of the most important health and welfare issues in intensive pig farming worldwide (Flesja and Ulvesaeter, 1980;Ujvári et al, 2015;Palzer et al, 2015;Sárközi et al, 2015;Čobanović et al, 2016a;Lukač et al, 2016;Polaček and Aleksić-Kovačević, 2016). They cause significant financial losses to the pig industry, arising from reduced growth rate and feed conversion, high morbidity and mortality, increased medication costs, condemnation of offal and carcasses, and lower carcass quality (Ostanello et al, 2007;Becskei et al, 2010;Fraile et al, 2010;Toplak et al, 2012;Čobanović et al, 2015;Štukelj et al, 2015;Szeredi et al, 2015). In most cases, respiratory diseases occur in subclinical form and, therefore, a clinical examination on the farm of origin cannot be regarded as an efficient method for their assessment (Ostanello et al, 2007).…”

Комплексна Профілактика Респіраторних Хвороб Свиней Із Застосуванням Вакцини, Алогенної Імунної Сироватки Та Антибактеріальних Препаратів

“…Пізніше всі перевірені проби, отримані від відлучених поросят, а також поросят із груп дорощування та відгодівлі були негативними. Інокуляція сироватки племінного стада виявилася успішним заходом для усунення РРСС на цій фермі від опоросу до кінця відгодівлі [26].…”

“…Ефективність такого комплексного підходу підтверджена дослідженнями ряду зарубіжних авторів[1, 3, 5,15]. Ми отримали гарні результати при застосуванні вакцинації проти РРСС та пасивної імунізації «фермерською сироваткою», що відповідає результатам, які отримали інші дослідники[7,10,14,17,21,22,24,26].…”