Effects of Dietary Energy Level on Nutrient Apparent Digestibility, Rumen Fermentation and Serum Biochemical Indexes of Jinjiang Cattle in Later Stage of Fattening

  • BAI Jun ,
  • LI Meifa ,
  • XIN Junping ,
  • ZHAO Erlong ,
  • XU Lanjiao ,
  • LIANG Huan ,
  • YANG Shitang ,
  • YANG Jianjun ,
  • YI Zhonghua ,
  • QU Mingren ,
  • LI Yanjiao
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  • 1. Jiangxi Province Key Laboratory of Animal Nutrition, Engineering Research Center of Feed Development, Jiangxi Agricultural University, Nanchang 330045, China;
    2. National Beef Cattle Industrial Technology System of Gaoan Test Station, Gao'an 330800, China

Received date: 2019-10-13

  Online published: 2020-04-16

Supported by

 

Abstract

The purpose of this study was to investigate the effects of dietary energy level on apparent digestibility of nutrients, rumen fermentation and serum biochemical indexes of Jinjiang cattle in the later stage of fattening. A total of 35 cattle with a similar body weight of (355.94±35.11) kg in the later stage of fattening were divided into 5 groups with 4 replicates in each group and with 1 or 2 cattle in each replicate. Five test diets with different energy levels were prepared according to Standard of Beef Cattle Breeding (NY/T 815-2004) in the 350 kg of beef cattle daily gain of 1.2 kg/d required for 100% of the net energy (group A), 106% (group B), 112% (group C), 118% (group d), 124% (group E), the comprehensive net (NEmf) of those five test diets were 6.21, 6.58, 6.95, 7.33 and 7.70 MJ/kg, respectively, and the crude protein levels were consistent. The pretest period was 10 days and the pretest period was 128 days. The results showed as follows:1) with the increase of dietary energy level, average daily weight gain in groups B and E was the highest, but the difference was not significant compared with other groups (P>0.05); the average dry matter intake was the highest in B group, but there was no significant difference among groups (P>0.05); compared with group A, the feed/gain in other groups was significantly reduced (P<0.05). 2) With the increase of dietary energy level, there was no significant difference in nutrient apparent digestibilities among groups (P>0.05). 3) Compared with group A, the pH in groups D and E was significantly reduced (P<0.05); the content of ammoniacal nitrogen in groups B and C was significantly lower than that in other groups (P<0.05); there was no significant difference in mycoprotein content among groups (P>0.05), but the highest value was found in group B; the total volatile fatty acid (TVFA) content in each group presented an upward trend, and the acetic acid/propionic acid in group B was significantly lower than that in group A (P<0.05). 4) The serum glucose content in groups B and C increased significantly by 19.38% and 14.72%, respectively compared with the control group (P<0.05). The serum urea nitrogen content in groups B, C and D was significantly reduced compared with group A (P<0.05), while serum alanine aminotransferase (ALT) activity and high-density lipoprotein (HDL) content were significantly increased compared with group A (P<0.05). To sum up, under the conditions of this experiment, with the increase of dietary energy level, there is no significant effect on apparent digestibility of nutrients of Jinjiang cattle. The diet with appropriate energy level is helpful to improve synthesis of microprotein and utilization of ammonia nitrogen, improving the growth and metabolism level of Jinjiang cattle, which improve production efficiency. The NEmf of 6.58 MJ/kg is more suitable for Jinjiang cattle to be fattened in the later stage of fattening obtained by combining various indexes.

Cite this article

BAI Jun , LI Meifa , XIN Junping , ZHAO Erlong , XU Lanjiao , LIANG Huan , YANG Shitang , YANG Jianjun , YI Zhonghua , QU Mingren , LI Yanjiao . Effects of Dietary Energy Level on Nutrient Apparent Digestibility, Rumen Fermentation and Serum Biochemical Indexes of Jinjiang Cattle in Later Stage of Fattening[J]. Chinese Journal of Animal Nutrition, 2020 , 32(4) : 1713 -1720 . DOI: 10.3969/j.issn.1006-267x.2020.04.030

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