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Abstract
Utlu, N. and Celebi, S. 2003. Effect of different fat sources on some enzyme activities in laying hens. J. Appl. Anim. Res., 24: 159–164.
To examine the effects of different vegetable and animal fat sources on some enzyme activities and protein metabolism, 270 laying hens were randomly divided into 9 groups of 30 each (one control and 8 experimental groups). In experiment 1 and 2, four experimental groups (II, III, TV and V) each were fed with a diet supplemented with 2% or 4% tallow (TO), mixture of tallow-flaxseed oil (1:1 w/w) (MTFO), sunflower (SO) and flaxseed oils (FO), respectively for 8 wks. The serum AST, ALP, ALT and LDH activities in groups of 4% TO and MTFO were higher than that of control group (POM). The 2% level of TO, MTFO (1:1 w/w), SO and FO and 4% of SO and FO did not affect various tissues. However, 4% TO and MTFO (1:1 w/w) significantly affected various tissues. It is concluded that 4% TO and MTFO, used as energy sources in diet of layers, are harmful for laying hens.