INFLUENCE OF VARIOUS SOURCES OF PROTEIN IN DIETS OF LACTATING SOWS ON THEIR PERFORMANCE

The purpose of this study was to evaluate various sources of protein in diets of lactating sows (fish meal, soybean oil meal and meat meal) and the effects of their supplementation on sows production. Forty-eight F₁ crossbred lactating sows (Large White x Swedish Landrace) were assigned to four treatment on the basis of litter order and weight. During pregnancy all the sows were fed the same diet. They were group fed in indoor concrete pens equipped with self-feeders and automatic waterers. During lactation period the sows were individualy fed with the mixtures of different composition (tab. 2). Control group of sows (I) was fed standard diet, but second group was fed with diet contained soybean protein, third group was fed with diet contained fish meal, and fourth group was fed diet contained meat protein. Sukling piglets received supplementary diet of the same composition. The piglets were weaned at four weeks of age. The data from this trial was evaluated by analysis of variance techniques as outlined by Barić (1964). On the basis of obtained results the following conclusions may be drawn: 1. Various sources of protein in diets of lactating sows did not have significant effect on their body weight changes and milk production. 2. Litter size at weaning and level of surviving of suekling piglets were not effected by various protein sources in ration of lactating sows. 3. Weaning weight of piglets of control group was significantly lower (P