INFLUÊNCIA DO SISTEMA DE ALIMENTAÇÃO DE FÊMEAS SUÍNAS EM GESTAÇÃO NO DESEMPENHO PRODUTIVO DA LEITEGADA

Abstract

Analyze if the feeding system influences the productive performance of the piglets. For the study was used 59 females in gestation phase, being primiparous (first birth) and multiparous with order 2 to 4, comparing two feeding systems (conventional and automatic). During the birth was collected on individual weight at birth before the first suckling, total number of piglets, live births, stillbirths, mummified, dead at birth and low viability (piglets below 500gr), excluding weigth of mummified piglets. The study was developed in a completely randomized design, with two treatments: feeding form and parity order. All variables studied had data submited to normality test (Shapiro-Wilk test) and homoscedasticity. The variables of total piglets per litter and average litter weigth were compared by the Mann-Whitney test for the feeding form and the Kruskal-Wallis test followed by the Student T test adjusted for calving order and interactions. Piglets classification frequency distribution evaluations were submitted to the Qui-quadrado test, except for the zero results, compared by Fisher’s exact test. A significance level of 0,05 was adopted in all tests, using the aid of R software (Core Development Core Team, 2019). The average weight of piglets at birth whn comparing the two feeding forms showed difference (p <0,05), with the automatic system being 1.35kg while the conventional system 1.22kg. The average litter weigth differed between birth orders 1 and 4 (16.6 and 22.5 kg) and in birth orders 1 and 3 (1.21 and 1.45kg) there was a difference in mean weight of piglet (p<0,05). Regarding the litter characteristics, there was a difference between first calving females in the other calving orders in relation to th number of mummified piglets (p<0,005).