Impiego di un lievito coltivato su metanolo nell' alimentazione delle galline ovaiole.
1984
Succi G. | Crovetto G.M. | Pialorsi S.
Wide researches on the possible use for animal feeding of products obtained by fermentation processes on not conventional substrates, were stimulated by the high cost of feedstuffs, particularly of those rich in protein (soybean-, fish- and meat meal). LI 70 is a methanol-grown yeast obtained from a strain of the species 'Candida Boidinii'. The LI 70 Yeast has a high biological value and a protein efficiency ration similar to that of soybean meal; in comparison with soybean meal, the LI 70 yeast has a higher protein content. Similarly to the soybean meal, the LI 70 yeast has a very high percentage of fatty acids with even number of C-atoms and the ration between unsaturated and saturated fatty acids is 3:1. In this research the efficacy of the LI 70 yeast added at different levels (5, 10 and 15%) to feedstuff of laying hens replacing soybean meal, was studied. The 64 laying hens were randomly assigned to four treatments. During the experiment which lasted 37 weeks, the egg production (number and weight), the feed consumption, the weight percentages of albumen, yolk and shell and the intensity of the yolk colour, were ascertained periodically. From the data obtained it appears a similarity between the control group and the group with 15% LI 70 in the diet. The groups with 5 and 10 per cent LI 70 in the diet had similar performances which were worse as compared with those of the other two groups. The only statistically significant difference (P<0,01) between control and 15 per cent LI 70 groups was found in the intensity of the yolk colour which was higher in the group fed the yeast. The intensity of yolk colour increased with increasing quantities of LI 70 in the diet.
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