December 21, 2010

 

Study shows Xylanase and corn DDGS boost broiler diets

 

 

Chinese researchers, together with Danisco, have studied that combining xylanase with corn distillers dried grains with solubles (cDDGS) can improve growth performance and digestibility of diet components in broilers.

 

The objective of this study was to investigate the effect of corn distillers dried grains with solubles (cDDGS) and xylanase in corn-based diets on growth performance and digestibility of diet components in broiler chickens.

 

The experiment was a 3×4 factorial design with diets containing three levels of cDDGS (0, 100 and 200 g/kg) and four levels of xylanase (0, 1200, 2400 and 3600 U/kg).

 

The diets were fed to 720 Cobb 500 chicks for 42 days. Excreta was collected at 18–21 days to measure coefficients of total tract apparent digestibility (CTTAD) and ileal digesta was collected at 42 days to measure coefficients of ileal apparent digestibility (CIAD).

 

Dietary cDDGS caused poor feed conversion ratio (FCR) of broilers from 1-21 and 22-42 days, but increased feed intake (FI) at 1–21 days.

 

Inclusion of xylanase increased feed intake by 4–5% at 1–21 days, and did not affect FCR in either period.

 

In the two growing periods, cDDGS decreased the CTTAD of and the CIAD of dry matter and hemicelluloses, whereas xylanase increased the digestibility of dry matter and hemicellulose by 5% and 20%, respectively.

 

There were significant interactions between cDDGS and xylanase for body weight gain and energy digestibility.

 

In comparison with the 100 g/kg cDDGS diet, the inclusion of 200 g/kg cDDGS led to poorer FCR at 22–42 days, and lower CTTAD of dry matter at 18–21 days.

 

There were no differences in most growth parameters between the doses of xylanase at 1200, 2400 and 3600 U/kg.

 

Xylanase at 2400 U/kg increased CTTAD of dry matter compared with the lower dose, but 3600 U/kg xylanase showed no further improvement on digestibility measurements.