[Show abstract][Hide abstract] ABSTRACT: The aim of the present study was to compare the effects of oral vaccination and feed medication against Lawsonia intracellularis (LI) on pig's performance. Growing-finishing pigs, in a large Hungarian production unit with a high prevalence of LI infection, which were positive for LI infection were randomly divided into 4 groups and treated as follows: Group one: growing pigs (n = 3810) were vaccinated against LI infection after entry into the growing-finishing unit with an avirulent live oral vaccine (Enterisol® Ileitis Boehringer Ingelheim Vetmedica, Inc., St. Joseph, USA). Group two: growing pigs (n = 3799) received feed medicated with doxycyclin (200 pp. doxycyclin hyclas, Primadox® 50, ufamed AG, 6210 Sursee, Switzerland) over a 3 week period after entry into the growing-finishing unit Group three: growing pigs (n = 3810) received chlortetracycline hydrochloride (500 ppm), tylosin tartrate (100 ppm) und suphadimidine sodium (1000 ppm) feed medication (SK 40 ad us vet., Biokema, 1023 Crissier, Switzerland) during a 3 week period after entry into the growing-finishing unit Group four: growing pigs (n = 3809) were not treated. Culling and mortality rates, reasons for culling and mortality, and average daily weight gain during the entire growing-finishing phase were evaluated. Porcine proliferative enteropathy (PPE) associated culling and mortality rates were lower (1.1%, 1.3% and 1.4% in groups 1-3, vs. 7.0% in the control group. P < 0.05). Both vaccinated and feed-medicated pigs had lower non-PPE associated culling and mortality rates compared with the non-vaccinated pigs (2.1%, 2.3% and 2.5% vs. 5.9%, P > 0.05). Average daily weight gain was greater (P < 0.05) both in the Ll vaccinated and feed-medicated groups of pigs compared with the untreated pigs (799 ± 49 g, 767 ± 48 g and 757 ± 39 g vs. 650 ± 92 g). The present results indicate that that both Ll vaccination and feed medication, at the beginning of the growing-finishing phase of the production, does not only prevent PPE, hut might result in more resistance and tolerance against other infectious and management caused losses as well.
No preview · Article · Jul 2006 · Tierärztliche Umschau
[Show abstract][Hide abstract] ABSTRACT: In order to examine the effect of different lactation weight losses of sows of different parity on subsequent reproductive performance, the present trial was performed in German (n = 4) and Slowakian (n = 11) indoor pig breeding units (n = 1677 sows evaluated). Weaning-to-service-intervals, farrowing rates and total-born litter sizes in sows with different lactation weight losses were compared. Sows were categorized according to lactation weight losses of <5%, 5-10%, 11-15%, 16-20%, >20%. Lactation weight losses exerted a quadratic effect (P < 0.01) on weaning-to-service-intervals. When analyzed across parity categories, with parity category included as a fixed effect, the weaning-to-service-intervals appeared to be minimized at lactation weight losses of <5%. Weaning-to-service-intervals increased (P < 0.05) when lactation weight losses increased above 5% for parity 1 sows, but not until lactation weight losses exceeded 10% for animals of parity 2 and more. There was a parity effect observed at lactation weight losses of <10%, P < 0.05, but the difference was not significant any more at lactation weight losses of >10%. Lactation weight losses >10% had a negative (P < 0.05) effect on subsequent farrowing rates to first service. The difference was higher (P < 0.01) in sows with lactation weight losses >20%. Lactation weight losses exerted a negative (P < 0.001) effect on total-born litter sizes in parity 1 versus parity >5 and parity 1 versus parity 2-5 sows at lactation weight losses of >10%. CONCLUSION: As weight loss of sows during lactation increases subsequent reproduction performance decreases.