Evaluation and Prediction Model Establishment of Digestible Energy and Metabolizable Energy of Cassava for Growing-Finishing Pigs

YANG Gang; LI Rui; FENG Ganyi; XIANG Qiang; TIAN Mingzhou; JIANG Xianji; LIU Xiaojie; FAN Zhiyong; HUANG Ruilin; YIN Yulong

doi:10.3969/j.issn.1006-267x.2022.03.013

2022 , Vol. 34 >Issue 3: 1486 - 1494

DOI: https://doi.org/10.3969/j.issn.1006-267x.2022.03.013

RESEARCH PAPER

Evaluation and Prediction Model Establishment of Digestible Energy and Metabolizable Energy of Cassava for Growing-Finishing Pigs

YANG Gang ,
LI Rui ,
FENG Ganyi ,
XIANG Qiang ,
TIAN Mingzhou ,
JIANG Xianji ,
LIU Xiaojie ,
FAN Zhiyong ,
HUANG Ruilin ,
YIN Yulong

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1. Hunan Co-Innovation Center of Animal Production Safety, Hunan Agricultural University, Changsha 410128, China;
2. Key Laboratory of Agro-Ecological Processes in Subtropical Region of Chinese Academy of Sciences, National Engineering Laboratory for Poultry Breeding Pollution Control and Resource Technology, Key Laboratory of Animal Nutritional Physiology and Metabolic Process of Hunan, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China

Received date: 2021-08-31

Online published: 2022-03-14

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Abstract

This study was to determine the nutritional composition and digestible energy (DE) and metabolizable energy (ME) of cassava fed to growing-finishing pigs and to develop prediction models for DE and ME of cassava based on its effective chemical composition. Twenty-two healthy "Duroc×(Landrance×Yorkshire)" barrows with initial body weight of (50.0±1.7) kg were randomly selected and assigned to a basal diet and 10 cassava diets according to a replicated incomplete Latin square design of 11×3, respectively. The DE and ME of growing-finishing pigs were measured by total fecal and urine collection method and difference method. The DE and ME prediction equations of cassava fed to growing-finishing pigs based on its effective chemical composition were established via stepwise regression method. The results showed that the variation ranges of gross energy (GE) and the contents of crude protein (CP), dry matter (DM), ash (Ash), ether extract (EE), calcium (Ca), total phosphorus (TP), crude fiber (CF), neutral detergent fiber (NDF) and acid detergent fiber (ADF), total starch (TS) of 10 cassava samples under air-dry basis were 14.56 to 15.36 MJ/kg, 1.76% to 3.51%, 86.10% to 88.66%, 1.99% to 2.53%, 0.37% to 1.98%, 0.08% to 0.12%, 0.06% to 0.11%, 1.26% to 3.00%, 7.82% to 17.47%, 1.50% to 5.32% and 58.75% to 69.86%, respectively. The average DE and ME for 10 cassavas samples under air-dry basis were (13.52±0.68) MJ/kg and (13.25±0.67) MJ/kg, respectively. This study is concluded that the optimal prediction equations of DE and ME (air-dry basis) of cassava for growing-finishing pigs are DE=54.591-3.279GE+0.680CP+2.822Ash (R²=0.80) and ME=0.108+0.972DE (R²=0.98), respectively.

Key words： cassava; growing-finishing pig; digestible energy; metabolizable energy; prediction model

Cite this article

YANG Gang , LI Rui , FENG Ganyi , XIANG Qiang , TIAN Mingzhou , JIANG Xianji , LIU Xiaojie , FAN Zhiyong , HUANG Ruilin , YIN Yulong . Evaluation and Prediction Model Establishment of Digestible Energy and Metabolizable Energy of Cassava for Growing-Finishing Pigs[J]. Chinese Journal of Animal Nutrition, 2022 , 34(3) : 1486 -1494 . DOI: 10.3969/j.issn.1006-267x.2022.03.013

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