Replacing barley with different levels of cooked potato wastes in diet on growth performance, apparent digestibility of nutrients and qualitative and quantitative characteristics of carcasses of fattened Zell male lambs

Authors

1 MSC Animal Nutrition, Sari University of Agricultural Sciences and Natural Resources

2 Dept. of Animal Sciences, Sari University of Agricultural Sciences and Natural Resources

Abstract

Background and objectives: Potato waste can be used as an energy-rich feed in the diet of livestock. In addition, the amount of metabolizable energy in this product is equal to the grain's barley energy, but the starch in the rumen is slowly fermentable. In scientific studies on livestock, it showed that potato waste processing by cooking and other methods of its processing in the ruminant diet had beneficial effects on growth performance and apparent digestibility of nutrients. Considering this point, this study was conducted to investigate the effect of replacing barley with different levels of cooked potato wastes in diet on growth performance, apparent digestibility of nutrients and qualitative and quantitative characteristics of carcasses of fattened Zell male lambs
Materials and methods: Twenty Zell male lambs with an average initial weight 33±2 kg and 195±15 days’ age was used in a completely randomized design with four treatments and five replicates in 80 days. Experimental treatments include: 0, 15, 30 and 45 percent cooked potato wastes (DM basis).
Results: The results of performance traits showed that lambs receiving diets containing 30 and 45% potato waste had more weight gain rather than other treatments (p < 0.05). While experimental diets had no significant effect on feed intake and feed conversion ratio. The results of apparent digestibility of nutrients showed that diets containing 45% of cooked potato waste had the highest apparent digestibility of DM and control diet had the highest apparent digestibility of crude protein and NDF (P <0.05). The results of the carcass chemical composition analysis showed that the use of different levels of potato waste only had a significant effect on carcass moisture content (p < 0.05) and characteristics of carcass lambs were not statistically significant different between experimental groups.
Conclusion: The results of this study showed that due to the results of growth performance, especially the increase in final weights, as well as the increase in the level of consumption of cooked potato waste and the increased digestibility of dry matter, this processed waste is an appropriate replacement for barley as a source of energy in the diet. In addition, the use of different levels of cooked potato waste did not have a significant effect on the carcass characteristics of fattening lambs.The results of this study showed that due to the results of growth performance, especially the increase in final weights, as well as the increase in the level of consumption of cooked potato waste and the increased digestibility of dry matter, this processed waste is an appropriate replacement for barley as a source of energy in the diet. In addition, the use of different levels of cooked potato waste did not have a significant effect on the carcass characteristics of fattening lambs.

Keywords

References

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Journal of Ruminant Research
Volume 7, Issue 3
December 2019
Pages 13-26

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