Document Type : Research Paper

Authors

1 Animal Science Group, Faculty of Agriculture, Lorestan University, Khorramabad, Iran

2 Department of Animal Science, School of Agriculture, Lorestan University

3 Animal Science Group, Lorestan University

4 Animal Science Group, Faculty of Agriculture, Lorestan University, Khorramabad, Iran.

5 Animal Science Research Department, Khuzestan Agricultural and Natural Resources Research and Education Center, AREEO, Ahvaz, Iran

Abstract

The effects of non-protein nitrogen (NPN) source and feeding level on growth performance, digestibility of nutrients, blood metabolites and nutritional behavior of fattening lambs have been studied. 28 male lambs (age: 4-5 month; BW: 36.1±3) were used in a 2×2 factorial design with four experimental treatments for 60 days. Two type of NPN (urea and biuret) were used twice and three times a day. The results showed that lambs consuming biuret had a higher ADG and lower FCR (P<0.05) than those fed urea. The effect of NPN source on ADF digestibility was significant (P>0.05). There was no significant difference in blood glucose concentration between experimental treatments (P>0.05). The concentration of urea and blood urea nitrogen before and six hours after morning feeding was higher in lambs consuming urea than biuret (p<0.0.5). The concentration of total protein was significantly higher six hours after feeding in lambs consuming urea than biuret (P<0.0.5). The type of NPN source was not significant on the nutritional behavior of lambs (P>0.05) however, feeding level had a significant effect on eating behavior, chewing, eating dry matter and eating NDF consumption (P<0.05). In general, it can be concluded that the use of biuret improves growth performance and nitrogen metabolism as compared to urea in fattening lambs.

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Main Subjects

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