EFFECTS OF THE SOY ISOFLAVONES ON THE GROWTH AND THE EXTERIOR DEVELOPMENT OF THE ISA BROWN PULLETS

NATASHA GJORGOVSKA, KIRIL FILEV

Abstract: The soy isoflavones are phytoestrogens with the same structure as the estrogen hormones, but with weaker activity. According to some authors, they influence the growth and the body weight of small chicken. Because of this we conducted a study to establish the effect of isoflavones on the growth performances and the body weight of light strain chicken, from hatching to 20 weeks of age. The investigation has been made in a rearing farm. The feed in different periods was enriched with 40.88% isoflavone additive with amount of 300, 600, 1200 and 1800 mg /kg feed. From the obtained results of the investigation it can be concluded that soy isoflavones offered in different concentrations in the feed have influence on the body weight of the pulletes at all different ages during the experiment. The results of this investigation suggest that isoflavones supplemented in the diet did not influence the skeletal exterior indexes (Long-leggedness, Stockiness and Massiveness) of the ISA brown pullets.

Keywords: body weight; chicken; isoflavones; pullets

Date published: 2023-01-31