肉鸡皮大麦表观代谢能预测模型研究

doi:10.11843/j.issn.0366-6964.2018.10.014

Abstract

Abstract:

This study aimed to establish the regression equations of metabolizable energy of hulled barley based on conventional physiochemical parameters by the methods of laboratory analysis and broilers metabolic test, so as to provide a convenient method for estimating the metabolizable energy values of hulled barley in practice. Trial 1:the physical and chemical parameters were determined for hulled barley imported from Australia and its milling isolates. Five artificial hulled barleys with different nutrient gradients were formulated with milling isolates from hulled barley based on the main classification indexes, namely crude protein, crude fiber and crude ash according to the classification standard of the People's Republic of China. Trial 2:seven hundred twenty healthy male AA⁺ broilers were used (360 for 11-13 d trial, 360 for 25-27 d trial). The birds were randomly allocated into 5 groups with 12 replicates of 6 birds. The birds of each treatment group were fed one of the 5 artificial hulled barley diets, namely A, B, C, D and E. The apparent metabolizable energy (AME), nitrogen corrected apparent metabolizable energy (AMEn) and nutrient apparent digestibility of the artificial hulled barleys were measured by total collection method for broilers of 11 to 13 and 25 to 27 days. And the stepwise regression method was used to establish regression equations for AME and AMEn. The results showed that:1) Barley types had significant influence on AME, AMEn, digestibility of CP, EE, STC, Ca, P and BWG(P<0.05); Days of age of broilers had significant influence on AME, AMEn, digestibility of EE, STC, P and BWG in broilers (P<0.05). The digestibility of EE and STC were 6.52% and 8.30% higher in birds on d 25 to 27 than these on d 11 to 13 (P<0.05). The AME and AMEn were 0.47 and 0.50 MJ·kg^-1 higher in birds on d 25 to 27 than these on d 11 to 13(P<0.05). 2) The prediction equations for AME (MJ·kg^-1 DM) and AMEn(MJ·kg^-1 DM)of hulled barleys for broilers were as follows:AME=7.814+10.166TP+0.106NDF (R²=0.996,P=0.004), AMEn=10.336+9.740TP-0.121CP (R²=0.983,P=0.017) for 11-13 d; AME=10.436+5.974NaCl+0.131EE+0.019NDF(R²=0.999,P=0.002), AMEn=15.284 -0.312CP+0.258EE-0.081NDF(R²=0.998,P=0.014) for 25-27 d. The maximum difference between the calculated AME values for artificial hulled barley diets using prediction equations and the measured values was 0.06 MJ·kg^-1.In conclusion, the main influencing factors in the regression model are conventional nutritional parameters, namely crude protein, total phosphorus, sodium chloride, ether extract, neutral detergent fiber(NDF), which make it suitable for wide application in production practice.

CLC Number:

DU Bao-hua, CHEN Si, ZHANG Xiang-de, HE Ning, YANG Xin, GUO Yu-ming, YAO Jun-hu, YANG Xiao-jun. Prediction Model of Apparent Metabolizable Energy of Hulled Barley in Broiler[J]. ACTA VETERINARIA ET ZOOTECHNICA SINICA, 2018, 49(10): 2180-2190.

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Prediction Model of Apparent Metabolizable Energy of Hulled Barley in Broiler

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