SURVEY OF THE COLLECTED DATA OF THE SWINE FARM OF THE COLLEGE OF MEDICINE VETERINARY AND ANIMAL SCIENCE OF THE UNESP. 1. LITTER SIZE

Abstract

With the data collected in the swine farm of the College of Medicine Veterinary and Animal Science, in the period of 1997 to 2007, the effect of childbirth order (CBO), season of childbirth (SCB), year of childbirth (YCB) were studied, in the variable: number of alive piglets at birth (NA), number of death piglets at birth (ND), number of total piglets at birth (NTP), number of piglets death to birth at weaned (NPDW) and total weaned piglets (TWP). The averages adjusted of NA, ND, NTP, NPDW and TWP was 9.541±2.520, 1.041±1.311, 10.582±2.656, 1.365±1.461 and 8.176±2.417, respectively. Do not observe effect of SCB on the all variable studied, and to YCB was observed a positive effect on the NPDW and TWP. The childbirth order (CBO) had significant quadratic effect on ND, NTP, and TWP, with better resulted observed in the third childbirth and linear to ND, with worse resulted in the first childbirth.