Chinese Journal of Animal Nutrition >

2022 , Vol. 34 >Issue 12: 7970 - 7980

DOI: https://doi.org/10.3969/j.issn.1006-267x.2022.12.045

RESEARCH PAPER

Energy Requirement of Dezhou Donkeys during Growth Period

  • YANG Quan ,
  • WANG Yun ,
  • ZHANG Chen ,
  • DIAO Keqiang ,
  • LI Han ,
  • ZHANG Guiguo ,
  • ZHANG Chongyu
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  • Shandong Key Laboratory of Animal Bioengineering and Disease Prevention and Control, School of Animal Science and Technology, Shandong Agricultural University, Tai'an 271018, China

Received date: 2022-05-05

  Online published: 2022-12-15

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Abstract

The objective of this experiment was to investigate the energy requirement of Dezhou donkeys during 110 to 160 kg growing period. Thirty 6-month-old Dezhou donkeys with body weight about 110 kg were divided into 3 groups (low energy group, medium energy group and high energy group) according to the principle of similar body weight, each group contained 10 replicates and 1 donkey in each replicate. The experiment started with the body weight about 110 kg and ended with the body weight about 160 kg. The experiment divided into two phases:the adaptation period of test phase Ⅰ was 15 days, and the trial period was 60 days; the adaptation period of test phase Ⅱ was 20 days, and the trial period was 30 days. During the test phase Ⅰ, donkeys were fed with a fixed amount of diet in first 30 days of, and free feeding in last 30 days; During the test phase Ⅱ, donkeys were free feeding. During the test phase Ⅰ, the dietary digestible energy of low energy group, medium energy group and high energy group were 9.51, 10.05 and 12.36 MJ/kg, respectively. During the test phase Ⅱ, the dietary digestible energy of low energy group, medium energy group and high energy group were 10.61, 10.95 and 11.82 MJ/kg, respectively. The results showed as follows:1) when the Dezhou donkeys during 110 to 160 kg growing period were fed with 3 kinds of energy level diets, the gross energy digestibility (DE/GE) and apparent digestibility of dry matter (DM), organic matter (OM), nitrogen free extract (NFE), carbohydrate (CHO) and neutral soluble carbohydrate (NDSC) of high energy group were significantly higher than those of low energy group and medium energy group (P<0.05). 2) Diets with different energy levels had significant effects on the average daily gain (ADG) and feed to gain ratio (F/G) of Dezhou donkeys during 110 to 160 kg growth period (P<0.05). 3) Diets with different energy levels had significant effects on the DE/GE and gross energy metabolic rate (ME/GE) of Dezhou donkeys during 110 to 160 kg growth period (P<0.05), while had no significant effect on metabolizable energy/digestive energy (ME/DE) (P>0.05). Based on the experiment results, The energy requirement models of Dezhou donkeys during 110 to 160 kg growth period were as follows:Digestive energy requirement (DER, kJ)=541.07W0.75+23.78ADG (r=0.996 5, n=90, P<0.01), metabolizable energy requirement (MER, kJ)=511.23W0.75+22.21ADG (r=0.990 4, n=90, P<0.01), and the W0.75 was metabolic weight.

Key words： Dezhou donkeys during growth period; energy requirement; energy utilization; growth performance

Cite this article

YANG Quan , WANG Yun , ZHANG Chen , DIAO Keqiang , LI Han , ZHANG Guiguo , ZHANG Chongyu . Energy Requirement of Dezhou Donkeys during Growth Period[J]. Chinese Journal of Animal Nutrition, 2022 , 34(12) : 7970 -7980 . DOI: 10.3969/j.issn.1006-267x.2022.12.045

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