EXPERIMENTAL METHOD AND ANIMAL

Comparison of Cecectomy, Canulation or Slaughter Methods to Determine Apparent Digestibilities of Amino Acid in Diet for Roosters

  • CHEN Jiang ,
  • YU Yao ,
  • ZOU Yi ,
  • DU Zhongyuan ,
  • WANG Yuming ,
  • TAN Huize ,
  • LIU Songbai ,
  • ZENG Shuli ,
  • HE Xi ,
  • ZHAO Feng
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  • 1. College of Animal Science and Technology, Hunan Agricultural University, Changsha 410128, China;
    2. State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
    3. Wen's Food Group Co., Ltd., Xinxing 527439, China

Received date: 2021-01-08

  Online published: 2021-07-06

Supported by

 

Abstract

This experiment was conducted to compare the contents of titanium dioxide (TiO2) and amino acid and apparent digestibilities of amino acid in diet of excreta collected by cecectomy, ileal digesta collected by cannulation and slaughter methods, to provide a proper reference to determine apparent digestibilies of amino acid. One hundred and eighty-six yellow-feathered roosters (n=39 for the first batch, n=147 for the second batch; average body weight ranged from 1.40 to 1.52 kg)were cecectomized and 47 yellow-feathered roosters (average body was 1.51 kg) were surgically fitted with a cannula in the distal ileum, and the recovery after operation was observed. A single factor completely random deign was adopted, 3 treatments were excreta in cecectomy, ileal digesta in cannulation method and ileal digesta in slaughter. There were 6 replicates in each treatment and 2 roosters in each replicate of samples collected by cecectomy and cannulation methods; there were 6 replicates in each treatment and 3 roosters in each replicate of samples collected by slaughter method. The apparent digestibilities of amino acid of different sources of broilers digested samples was determined. The results showed as follows:1) there was no significant difference in body weight gain on days 7, 14 and 21 after operation between cecectomized roosters and cannulated roosters (P>0.05). The death and cull rates at 3 months after the operation of the first and second batch of cecectomized roosters and cannulated roosters were 23.1%, 20.4% and 33.9%, respectively. 2) There was a significant difference in TiO2 content in excreta in cecectomy, ileal digesta in cannulation method and ileal digesta in slaughter method (P<0.05). The contents of cysteine, threonine and proline in excreta in cecectomy were significantly lower than those in ileal digesta in cannulation method (P<0.05), and the contents of histidine, lysine, glycine and phenylalanine were significantly higher than those in ileal digesta in cannulation method and ileal digesta in slaughter method (P<0.05). The contents of cysteine, threonine and proline in ileal digesta in cannulation method were significantly higher than those in ileal digesta in slaughter method (P<0.05). 3) The apparent digestibilities of cysteine, threonine, valine, aspartate and proline in diet determined with cecectomy total collection method were significantly higher than those determined with cannulation method (P<0.05), the apparent digestibilities of histidine, lysine, glycine and Phenylalanine in diet determined with cecectomy total collection method were significantly lower than those determined with slaughter method (P<0.05), and the apparent digestibilities of cysteine, histidine, lysine, threonine, valine, aspartic acid, glycine, phenylalanine, proline and total amino acid in diet determined with cannulation method were significantly lower than those determined with slaughter method (P<0.05). 4) Overall, the apparent digestibilities of amino acid in diet and their coefficient of variation determined with cecectomy and slaughter methods were close, and the coefficient of variation of apparent digestibilities of amino acid in diet determined with cannulation method was greater. These results indicate that the apparent digestibilities of amino acid determined with excreta collected by cecectomy is comparable with that determined with ileal digesta collected by slaughtered method, whereas ileal digesta collected by cannulated method is not recommended for determining the apparent digestibilities of amino acids.

Cite this article

CHEN Jiang , YU Yao , ZOU Yi , DU Zhongyuan , WANG Yuming , TAN Huize , LIU Songbai , ZENG Shuli , HE Xi , ZHAO Feng . Comparison of Cecectomy, Canulation or Slaughter Methods to Determine Apparent Digestibilities of Amino Acid in Diet for Roosters[J]. Chinese Journal of Animal Nutrition, 2021 , 33(7) : 4098 -4109 . DOI: 10.3969/j.issn.1006-267x.2021.07.051

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