• The gastro intestinal tract (GIT) of the newly-hatched chick is largely considered sterile, although there is some evidence to suggest that the caeca of embryonic chicks can already be colonised by bacteria from the mother hen.
  • Ensuring this biome transfer is balanced and of a beneficial bacterial population has a profound impact on the lifetime performance of the chick.
  • Salkil improved breeder performance by significantly increasing fertility and showed significant positive effects on progeny of the breeder flock.



A study was conducted with the University of São Paulo, Brazil whereby 64 Cobb 500 broiler breeders were randomly allocated to 1 of 2 treatments at 25 weeks of age; control diet (control); and control diet with Salkil included at 2kg/t (Salkil), with 8 replicates of 4 birds in each pen. The diets were fed from 25 to 45 weeks of age. At 45 weeks birds were inseminated and eggs were collected and incubated to evaluate the effect of treatment on egg quality, fertility and hatchability (of fertile eggs). A further study was then run to investigate any effects on the progeny. 240 chicks (120 from each treatment: 8 reps of 15 chicks per pen) were reared as commercial broilers from day old until 42 days of age and fed standard control diets with no feed additives. Feed intake, weight gain and feed conversion ratio (FCR) were measured.


Graph showing breeder performance at 45 weeksFigure 1. Breeder performance at 45 weeks

Graph showing Percent difference between treatments in progeny at 42 days oldFigure 2. Percent difference between treatments in progeny at 42 days old

  • The inclusion of Salkil in the breeder diet significantly improved egg fertility and subsequent hatchability.
  • Broilers from breeders that received Salkil had significantly increased weight gain and a significantly lower FCR than broilers from the breeders that did not receive Salkil (Control).
  • Salkil has been shown to be a cost effective acid based eubiotic providing improvements in both breeder and progeny performance.