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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.17.0755    [Accepted] Published online December 19, 2017.
Effect of diets with different energy and lipase levels on performance, digestibility and carcass trait in broilers
Y.D Hu1,*, D. Lan1, Y. Zhu1, H.Z. Pang1, X.P. Mu1, X.F. Hu1
Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Ya'an, China
Correspondence:  Y.D Hu, Tel: +86 02886291265, Fax: +86 02886291265, Email: 13982@sicau.edu.cn
Received: 12 October 2017   • Revised: 18 November 2017   • Accepted: 18 December 2017
Abstract
Objective: A 28-d trial was conducted to evaluate the effect of diets with different energy and lipase levels on performance, nutrient digestibility, serum profiles, gut health and carcass quality in broilers.

Methods

A total of 720 one-day-old male Ross 308 broilers (45.4±0.5 g) were randomly assigned to one of the following four treatments: i) RET, reduced energy treatment (ME = 2,950 and 3,100 kcal/kg for starter and finisher diet), ii) BDT, basal diet treatment (ME = 3,050 and 3,200 kcal/kg for starter and finisher diet, iii) RET015, RET + 0.15 g/kg lipase, and iv) RET03, RET + 0.3 g/kg lipase. There were 10 replications (cages) per treatment with 18 birds per cage.

Results

During d 1–14, broilers fed BDT, RET015 and RET03 diets had higher (P<0.05) BWG than those fed RET diet. During d 1-14, 15-28 and the overall experiment, FCR in RET03 treatment was lower (P<0.05) compared with RET treatment. On d 14, the ATTD of DM, EE and GE in RET03 treatment was higher (P<0.05) than those in RET treatment, while the ATTD of N was increased (P<0.05) by RET03 treatment. On d 28, broilers fed RET03 diet had higher (P<0.05) ATTD of DM than those fed RET and RET015 diets, while the ATTD of EE in BDT and RET03 treatments was increased (P<0.05) compared with RET and RET015 treatments. Broilers fed RET03 diet had higher VH and VH: CD ratio than those fed RET and BDT diets. The activity of pancreatic lipase in BDT and RET03 treatments was higher (P<0.05) than that in RET treatment.
Conclusion
Taken together, lipase supplementation (3000 U/kg feed) increased growth performance, nutrient digestibility, VH, VH: CD ratio and lipase activity, but decreased TG, LDL-C and the abdominal fat percentage in broilers fed reduced energy diet.
Keywords: Broiler; Digestibility; Energy; Lipase; Performance


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