Abstract
Performance, protein synthesis and mucosal DNA in small intestine of Leghorn hens may be affected by low quality feedstuff. An experiment was conducted in completely randomized design (CRD) in 2 × 2 factorial arrangement. Main factors included diets containing 20 and 40 % barley and black and blue strains of leghorn. Layer performance was recorded weekly up to eight weeks. Egg production (%), egg mass and egg number were significantly higher in black strain leghorn on 20% barley diet than blue strain with 40% barley diet (P<0.05). Treatments blue × 40% barley and black × 20% barley showed lowest and highest egg production percentage, egg mass and egg number, respectively (P<0.05). The lowest protein synthesis in small intestine was shown in blue × 40% barley treatment group. Small intestine mucosal DNA quantity in blue strain was significantly higher than that in black strain (P<0.05). In contrast, protein synthesis in blue strain was lower than that in black strain (P<0.05). It was concluded that lower performance in blue × 40% treatment group could be related to lower protein synthesis in small intestine in blue strain, and this may be due to the high barley (40%) contained in diet. Key words: Performance, protein synthesis, mucosal DNA, small intestine.
Highlights
Egg production in laying hens is related to feed efficiency, but genetic and molecular mechanisms may play a vital role in protein synthesis from intestine into oviduct during egg production
Performance, protein synthesis and mucosal DNA in small intestine of Leghorn hens may be affected by low quality feedstuff
Egg production (%), egg mass and egg number were significantly higher in black strain leghorn on 20% barley diet than blue strain with 40% barley diet (P
Summary
Egg production in laying hens is related to feed efficiency, but genetic and molecular mechanisms may play a vital role in protein synthesis from intestine into oviduct during egg production. The chemical nature of NSP differs from one ingredient to another, but most soluble NSP generally increase digesta viscosity that interferes with nutrient intake and body growth (Evans et al, 1993; Smits and Annison, 1996). Some of the variation in the performance of laying hens on different cereal grains and some other ingredients has been ascribed to the nature and concentration of NSP (Kopinski et al 1995; Smits and Annison, 1996). Non starch polysaccharides have more undesirable effect on gastrointestinal organs, especially on small intestine. The small intestine is an important organ, contributing 9 to 12% of daily whole-body protein synthesis (Attaix and Arnal, 1987; Simon et al, 1982)
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