Metabolizable Energy and Net Energy Values of Cottonseed Meal and Corn Gluten Meal for Laying Hens by Using Indirect Calorimetry Method and Regression Method

NING Dong; GUO Yuming; WANG Yongwei; PENG Yunzhi

doi:10.3969/j.issn.1006-267x.2013.05.011

2013 , Vol. 25 >Issue 5: 968 - 977

DOI: https://doi.org/10.3969/j.issn.1006-267x.2013.05.011

Poultry Nutrition

Metabolizable Energy and Net Energy Values of Cottonseed Meal and Corn Gluten Meal for Laying Hens by Using Indirect Calorimetry Method and Regression Method

NING Dong ,
GUO Yuming ,
WANG Yongwei ,
PENG Yunzhi

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State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China

Received date: 2012-11-06

Online published: 2013-04-12

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Abstract

This experiment was conducted to estimate the metabolizable energy (ME) and net energy (NE) values of cottonseed meal and corn gluten meal for laying hens by using indirect calorimetry method and regression method. A total of 504 32-week-old dwarf pink-shell laying hens with similar body weight were randomly allocated into 7 treatments with 2 replicates per treatment and 36 laying hens per replicate. Hens in the control group were fed a corn-soybean meal based diet, and hens in the other groups were fed the experimental diets which was basal diet substituted by different ratios (5%, 10% and 20%) of cottonseed meal or corn gluten meal. After a 7-day adaptation period, two groups each with 36 hens were arranged into two same respiration chambers to measure the heat production (HP) for three days during the feeding period, and measured the HP at 1 to 72 h after fasting basal diet. The equilibrium fasting HP (FHP) may provide an estimate of NE requirements for maintenance (NEm). The NE intake from diets was determined by factorial method and the energy values of test ingredients were estimated based on the linear regression of dietary ME and NE values on substitution ratios. The results showed that the HP and respiration quotient of hens were lower on the 3rd day of starvation than those on the 2nd day (P<0.01). The heat increment was increased with the increase of substitution ratio of cottonseed meal or corn gluten meal. The dietary apparent metabolizable energy (AME), AME corrected for nitrogen retention (AMEn) and NE values were increased with the increase of substitution ratio of corn gluten meal, but decreased with the increase of substitution ratio of cottonseed meal. According to the linear regression equation between the dietary available energy value and test ingredients substitution ratio, the AME and AMEn values of cottonseed meal were 10.61 and 9.45 MJ/kg DM, and the AME and AMEn values of corn gluten meal were 17.62 and 15.80 MJ/kg DM. The cottonseed meal substitution group dietary NE=-2.321X₁＋8.676 (R²=0.739 3), and the corn gluten meal substitution group dietary NE=3.210X₂＋8.880 (R²=0.889 4), where X₁ and X₂ represented the substitution ratios of cottonseed meal and corn gluten meal, respectively. In conclusion, the NE estimation values of cottonseed meal and corn gluten meal are 6.35 and 12.09 MJ/kg DM, and the NE/AME are 59.91% and 68.60% for dwarf pink-shell laying hens at egg-laying peak when the environmental temperature is (20±1) ℃.

Key words： net energy; metabolizable energy; laying hens; cottonseed meal; corn gluten meal; heat production

Cite this article

NING Dong , GUO Yuming , WANG Yongwei , PENG Yunzhi . Metabolizable Energy and Net Energy Values of Cottonseed Meal and Corn Gluten Meal for Laying Hens by Using Indirect Calorimetry Method and Regression Method[J]. Chinese Journal of Animal Nutrition, 2013 , 25(5) : 968 -977 . DOI: 10.3969/j.issn.1006-267x.2013.05.011

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