Study on Substitution Method for Evaluating Net Energy of Corn in Fattening Dorper×Thin-Tailed Han Mutton Ewes

  • FENG Cairui ,
  • LI Baihao ,
  • LIANG Hao ,
  • ZHAO Xiaodong ,
  • LI Lijia ,
  • TIAN Zhigang ,
  • ZHANG Youliang ,
  • YAN Xiaogang
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  • 1. Animal Nutrition and Feed Institute, Jilin Academy of Agricultural Sciences, Gongzhuling 136100, China;
    2. College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, China;
    3. Animal Husbandry Administration of Jilin Province, Changchun 130118, China

Received date: 2021-09-08

  Online published: 2022-04-14

Abstract

This experiment was conducted to research if it was available to evaluate the net energy value of corn with substitution method in mutton ewes and to clarify the appropriate substitution ratio of corn in diet. Twenty-four Dorper×thin-tailed Han crossbred ewes with body weight of (38.39±4.02) kg were randomly assigned into 4 groups that included 1 basal diet (basal diet group) and 3 experimental diets (experimental groups) with different substitutional proportions (20%, 30% and 40%) of corn, and 6 ewes per group. The contents of corn in 4 groups were 27.53% (basal diet group), 42.19% (20% group), 49.46% (30% group) and 56.70% (40% group), respectively. The digestible energy (DE), metabolizable energy (ME) and net energy (NE) of diets were determined by digestibility and respiratory trials and DE, ME and NE of corn were estimated by substitution method. The results showed as follows:1) there was no significant difference among all groups in crude protein (CP) apparent digestibility (P>0.05). The apparent digestibility of dry matter (DM) and organic matter (OM) of diets in 30% group were extremely significantly higher than that in 20% group (P<0.01). The neutral detergent fiber (NDF) apparent digestibility of diets in 30% group was significantly higher than that in 40% group (P<0.05). There were no significant differences in DE, ME and NE of diets among all groups (P>0.05). 2) The apparent digestibility of OM and CP of corn among all experimental groups had no significant difference (P>0.05). The DM apparent digestibility of corn in 30% group was extremely significantly higher than that in 20% and 40% groups (P<0.01). The NDF apparent digestibility of corn in 20% and 30% groups was extremely significantly higher than that in 40% group (P<0.01). There were no significant differences in DE and ME of corn among all experimental groups (P>0.05). 3) The NE of corn in 20% and 30% groups was 12.25 and 10.17 MJ/kg, respectively, with no significant difference (P>0.05). While the NE of corn in 40% group was 5.51 MJ/kg, which was extremely significantly lower than that in 20% and 30% groups (P<0.01). As can be seen from all above shows that the measured effective energy values of corn are different when the substitution ratio of corn in the diet for mutton sheep is various, and the corn content in mutton sheep diet shouldn't exceed 50%. It's available to evaluate the NE of corn with substitution method in mutton sheep, and the appropriate substitution ratio is in range of 20% to 30% under the condition of this experiment.

Cite this article

FENG Cairui , LI Baihao , LIANG Hao , ZHAO Xiaodong , LI Lijia , TIAN Zhigang , ZHANG Youliang , YAN Xiaogang . Study on Substitution Method for Evaluating Net Energy of Corn in Fattening Dorper×Thin-Tailed Han Mutton Ewes[J]. Chinese Journal of Animal Nutrition, 2022 , 34(4) : 2667 -2676 . DOI: 10.3969/j.issn.1006-267x.2022.04.060

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