Effects of Dietary Energy Level on Growth Performance, Nutrient Digestion and Energy Metabolism of Jinjiang Steers in Early Stage of Fattening

BAI Jun, ZHAO Erlong, LI Meifa, XIN Junping, XU Lanjiao, QU Mingren, YI Zhonghua, YANG Shitang, YANG Jianjun, LI Yanjiao

doi:10.3969/j.issn.1006-267x.2019.02.025

2019 , Vol. 31 >Issue 2: 692 - 698

DOI: https://doi.org/10.3969/j.issn.1006-267x.2019.02.025

Molecular Nutrition

Effects of Dietary Energy Level on Growth Performance, Nutrient Digestion and Energy Metabolism of Jinjiang Steers in Early Stage of Fattening

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1. Engineering Research Center of Feed Development, Jiangxi Province Key Laboratory of Animal Nutrition, Jiangxi Agricultural University, Nanchang 330045, China;
2. National Beef Cattle Industrial Technology System of Gao'an Test Station, Gao'an 330800, China

Received date: 2018-07-31

Online published: 2019-02-18

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Abstract

This experiment was conducted to investigate the effects of dietary energy level on growth performance, energy metabolism, and to establish the model for digestive energy (DE) requirements of Jinjiang steers in the early stage of fattening (14 to 60 months of age). Fifty steers with good body condition and similar weight of (301.74 ±30.98) kg were randomly divided into 5 groups with 4 replicates per group and 2 to 3 steers per replicate. Group A was the energy control group, and the combined net energy (NE_mf) levels of steers in groups B, C, D and E were increased by 6%, 12%, 18% and 24%, respectively on the basis of group A. The NE_mf of the 5 diets was 6.02, 6.38, 6.74, 7.10 and 7.46 MJ/kg, respectively. Pre-test period was 10 days and test period was 116 days. The digestive metabolic test was conducted immediately after the feeding test. The growth performance and energy digestibility of Jinjiang steers were measuredl, and the model for DE requirements was established. The results showed as follows:1) the average daily gain (ADG) of Jinjiang steers was not significantly different among groups (P>0.05), but showed a gradual increase with the improvement of energy levels. The average dry matter intake (ADMI) in groups was decreased gradually with the increased energy levels, but the difference was not significant (P>0.05). The dietary energy levels had a significant influence on the feed to gain ratio (F/G), the F/G of groups C, D and E was significantly lower than that of group A (P<0.05). 2) The total energy intake, DE, total energy digestibility and nutrient apparent digestibility of Jinjiang steers were not significantly different among groups (P>0.05). 3) There was a high degree of positive linear correlation between ADG and DE (R²=0.996). In conclusion, under the experimental conditions, the improvement of dietary energy levels can improve the growth performance of Jinjiang steers; the DE requirement of Jinjiang steers can be estimated by the following equation:DE=0.638W^0.75+36.837×ADG.

Key words： Jinjiang steers; growth performance; energy metabolism; energy requirement

Cite this article

BAI Jun, ZHAO Erlong, LI Meifa, XIN Junping, XU Lanjiao, QU Mingren, YI Zhonghua, YANG Shitang, YANG Jianjun, LI Yanjiao . Effects of Dietary Energy Level on Growth Performance, Nutrient Digestion and Energy Metabolism of Jinjiang Steers in Early Stage of Fattening[J]. Chinese Journal of Animal Nutrition, 2019 , 31(2) : 692 -698 . DOI: 10.3969/j.issn.1006-267x.2019.02.025

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