DIGESTIBILITY OF NUTRIENTS AND NITROGEN RETENTION IN RABBITS UNDER THE VARIOUS AMOUNTS OF YEAST IN THE DIET

L. Darmohray1, М.Shevchenko1, I. Luchyn2

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1Lviv National University of Veterinary Medicine and Biotechnologies
named after S. Z. Gzhytskyj,

50Pekarska str., Lviv 79010, Ukraine

2Precarpathian State Agricultural Experimental Station,
Institute of Agriculture of the Carpathian Region NAAS,
21/a S. Bandera str., Ivano-Frankivsk76014, Ukraine

The research have been conducted to establish the influence of different amounts of yeast biomass from LLC «Polissya Production-pilot Plant» (TU 15.733336034-001:2005) in composition of granulated feed on nitrogen retention and digestibility of nutrients in young rabbits under intensive cultivation. To conduct this purpose 75 White Termonska breed rabbits at the age of 40 days were selected and divided into 5 groups. The young rabbits were fed with full-valued granulated feeds containing different content of fodder yeast: I control group — %, II research group — 5%, III —7%, IV — 9% andV — 1% appropriately. The duration of the experiment was 50 days. The feed consisted of corn middlings, barley middlings, oats middlings, wheat middlings, bran wheat, soybean expeller (35 % raw protein), pomace of sunflower seeds (28 % raw protein), winter wheat straw, yeast, salt, premix (4 %). Nutritional feed for rabbits of experimental groups was similar. With the increasing of fodder yeast number of soybean expeller was reduced.

Using fodder yeast in feed composition for young rabbits of White Termonska breed under intensive cultivation for meat had a positive impact on the nitrogen retention and digestibility of nutrients in rabbit organism. According to the results of scientific and economic experiment it was found that the optimal dose of fodder yeast in fodder of above mentioned young is 9 %.Rabbits in this group showed the higher indexes of nutrients digestibility than the same age rabbits in control group: accordingly, organic matter 1.4%, raw protein —2.2 % (P<0.05), raw fat —1.0 %, raw fiber —1.4 %, ESN (extacted substances nitrogencouless) —0.8 %. It was found that the highest rate of nitrogen retention in rabbits was in IV experimental group. Value of digestion and assimilation of nitrogen was at 7.76 % and 10.79 % higher compared with the control group, and value of absorbed from received and digested nitrogen was 1.65 % and 1.13 % higher respectively. Prospects for further research are in studying the effect of various amounts and strains of fodder yeasts and reproductive ability of female rabbits.

Keywords: YOUNG RABBITS, YEAST, ANIMAL FEED, DIGESTIBILITY OF NUTRIENTS, NITROGEN

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