Efecto de superdosis de fitasa sobre el desempeño productivo de cerdas reproductoras y su progenie durante la lactancia

Abstract

This study was carried out in Triunfo, Guayas, Ecuador, in the pig farm PORCIGRAN located in the Achote site; objective was to evaluating the inclusion of microbial phytase superdose in sows during lactation on their productive and reproductive behavior. 20 sows (n = 20) were used and randomly divided into two treatments: T1) Control: phytase at normal dose (800 OTU / Kg of food) considering its nutritional matrix and T2) Superdose: (1600 OTU / Kg of food, of which 800 OTU with nutritional matrix + 800 OTU on top). The sows were housed in individual cages and fed ad libitum stimulating consumption. In sows were evaluated: (weight, body condition, mm of dorsal fat) at the end of labor, weekly until weaning, also, interval - heat / coverage (open days), repetition rate and confirmation of pregnancy (at day 30 post-insemination). In piglets were evaluated: total born, live births, live weight at birth, weekly and at weaning; total biomass at birth, weekly and at weaning; and pre-southeast mortality. In addition, 4 milk samples were taken from each treatment on days: 0 (delivery), 11 and 21 (weaning) to assess their density, total solids, fat, protein, ash, calcium and phosphorus. A Student's T was used to measure the means between treatments and chi-square for percentages. The use of superdose (T2) showed no significant differences more than expected with respect to the normal dose (T1). Therefore, the weight in sows, on day 0-7 (8.3 vs. 15.8), as well as the fertility rate (100% vs. 60%) (p <0.05) were the worst in T2. There was no major significance with respect to the CC and mm of GD, weaned totals, pre-weaning viability, and open days. In the nutritional composition of milk, the superdose had a higher concentration of total solids (29.9 vs. 25.4), phosphorus (0.11 vs. 0.09), ashes (0.87 vs. 0.75) and density (1.04 vs 1.01) (p <0.05). In conclusion, the superdose in breeding sows during lactation has no a positive effects on productive and reproductive parameters.