The Effects of Metabolizable Energy Inclusion Rates on Feed Efficiency
Molly Cutter, Kevin Kasch, Eric Frazier, Sara Ludington, Michelle Sirum, Linnea Olson
There was no effect on decreasing ME by 5%. The 10% decrease in ME showed a
significant difference in only week 1. These results could have potentially been carried
into further weeks. The results of a study by Noy and Sklan (2002) supported the results
of this experiment. By varying nutrient amounts in diets, there is a distinct effect in
chicks during the first week of growth. The change in metabolizable energy had a
significant effect during the first 7 days, but by 18 days, there were no significant
differences. Decreases in growth rate were not seen in week 2 because there was no
difference in feed intake. Chicks already eat to capacity and cannot increase feed intake
as they would to make up for decreased ME. The average daily feed intake was not
affected by the lower energy requirement, implicating that the energy requirement may
not have been low enough to affect feed intake. Although the results showed that there
was a slight significant difference in average daily gain in chicks consuming feed during
week one between the control diet and the 10% reduced inclusion level, there was no
significant difference in other relevant comparisons. If this experiment would have
continued for a longer period of time the results would be more likely to show a
significant decrease in average daily gain in both of the diets containing decreased ME
E.A. Saleh, S.E. Watkins, A.L. Waldroup and P.W. Waldroup, Effects of Dietary Nutrient Density on
Performance and Carcass Quality of Male Broilers Grown for Further Processing, 10, January 2004.
5 April 2007
Leterrier, C. , N. Rose, P. Constantin, and Y. Nys. "Reducing growth rate in broiler chickens with a
low energy diet does not improve cortical bone quality." British Poultry Science. 39(1998): 24-30.
Noy,Y. Sklan, D. "The effects of toasting canola meal on body weight, feed conversion efficiency,
and mortality in broiler chickens.
." Poultry Science. 81(2002): 815-825.
Materials and Methods:
•30 male broilers were obtained on the day of hatch and fed an adjustment diet for 1
•Chicks were randomly assigned to petersime battery cages with nipple waterers and
trough feeders (5 chicks/pen)
•Two groups of chicks were assigned to each diet
•Birds checked daily and fed/watered as needed
•Body weights of the chicks in each pen as well as the weights of all six feeds were
•Diets were corn and soybean meal based, formulated to meet or exceed all nutrient
requirements (NRC, 1994)
•Diets 1, 2, and 3 contained 100, 95, and 90% of NRC (1994) recommended ME,
•Data analyzed using T-tests procedure of excel with a P-value <0.1 as being significant
Diet means that contain different superscripts are different (P<.10).