Apparent metabolizable and net energy values of corn and soybean meal for broiler breeding cocks

Abstract

The AME and net energy (NE) values of 4 corn varieties, including 2 normal corn varieties (Zheng Dan 958 and Xian Yu 335), and one each of waxy corn and sweet corn, and 2 soybean meal samples including regular (RSBM) and dehulled soybean meal (DSBM), were determined in 2 experiments for broiler breeding cocks using the indirect calorimetry method. The 4 test diets in Experiment 1 consisted of each test corn, which replaced 40% of the corn-soybean meal basal diet, and the test diets in Experiment 2 contained 25% RSBM or DSBM, which was used to replace the corn basal diet. Thirty (Experiment 1) or 18 (Experiment 2) 50-week-old Arbor Acre (AA) broiler breeding cocks were used in a completely randomized design. After a 7 d dietary adaptation period, 6 birds as replicates from each treatment were assigned to individual respiration chambers for energy measurement via gaseous exchange and total excreta collection for 10 d. In Experiment 1, the AME, ME intake (MEI), retained energy (RE), NE, and NE:AME ratio values were higher (P < 0.001) in the test diets as compared with the corn-soybean meal basal diet. The AME and NE values in the sweet corn diet were higher (P < 0.05) than those values in the other 3 test diets. The heat production (HP), fasting heat production (FHP), and respiration quotient (RQ) were not influenced by the various experimental diets. The respective AME and NE values were 3,785, 3,775, 3,738, and 3,997 kcal/kg (DM basis), and 2,982, 3,006, 2,959, and 3,146 kcal/kg (DM basis) for Zheng Dan 958, Xian Yu 335, waxy corn, and sweet corn. Birds fed a corn basal diet in Experiment 2 had higher AME, MEI, RE, NE, and NE:AME ratio values (P < 0.001). Soybean meal substitution had no effect on HP, FHP, or RQ. The average AME and NE content was 2,492 and 1,581 kcal/kg (DM basis) for RSBM, and 2,580 and 1,654 kcal/kg (DM basis) for DSBM, respectively.

Metabolizable and net energy values of corn stored for 3 years for laying hens

“…(2019b) in laying hens, respectively, in the corns. The AME values of 3,785 and 3,775 kcal/kg DM for 2 corn samples determined by the substitution method in broiler breeding cocks in our previous study ( Liu et al., 2017 ) were higher than the values for corn 1 and 2 in the present study.…”

“…The calculated NE values (2,682 and 2,829 kcal/kg DM) are close to the measured NE values (2,575 and 2,693 kcal/kg DM) for corn 1 and corn 2, respectively. The NE values of the 2 corn samples in the present study are lower than 2,982 and 3,006 kcal/kg DM previously reported by Liu et al. (2017) for 2 corn samples determined using the substitution method in broiler breeding cocks.…”

“…The design of the open-circuit respiratory chamber has been previously described by Liu et al. (2017) .…”

Effects of Fermentation on Standardized Ileal Digestibility of Amino Acids and Apparent Metabolizable Energy in Rapeseed Meal Fed to Broiler Chickens

“…Titanium dioxide (TiO 2 ) was added to diets at 0.4%, as an exogenous digestibility marker. The proportional replacement of the energy-yielding components was essential for the calculation of AME for FRSM and RSM [ 18 , 19 ]. Table 2 shows the ingredients and chemical compositions of the reference and experimental diets.…”

Forage Performance and Detection of Marker Trait Associations with Potential for Napier Grass (Cenchrus purpureus) Improvement

“…In livestock production, energy is one of the limiting factors in animal performance [44]. ME is the commonly used trait for evaluating energy content of feed [45]. Napier grass genotypes were within the range of ME content for tropical grasses [44].…”