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. 2024 Sep 25;14(19):2764.
doi: 10.3390/ani14192764.

Determination and Prediction of Amino Acid Digestibility in Rapeseed Cake for Growing-Finishing Pigs

Hui Tang  1   2 , Ganyi Feng  2 , Jingfeng Zhao  1 , Qing Ouyang  1   2 , Xiaojie Liu  1   2 , Xianji Jiang  1   2 , Menglong Deng  1   2 , Zhengjun Xie  3 , Fengming Chen  4 , Xihong Zhou  2 , Rui Li  1   2 , Yulong Yin  1   2
Affiliations

Determination and Prediction of Amino Acid Digestibility in Rapeseed Cake for Growing-Finishing Pigs

Hui Tang et al. Animals (Basel). .

Abstract

Objective: The experiment was conducted to determine the apparent or standardized ileal digestibility (AID or SID) of crude protein (CP) and amino acids (AA) in 10 rapeseed cake samples fed to pigs, and to construct predictive models for the SID of CP and AA based on the chemical composition of rapeseed cakes.

Methods: Twenty-two cannulated pigs (initial body weight: 39.8 ± 1.2 kg) were assigned to two 11 × 3 incomplete Latin square designs, including an N-free diet and 10 diets containing rapeseed cake. Each experimental period included 5 days of adaptation and 2 days of ileal digesta collection. Titanium dioxide (TiO2) was added at 0.3% to all the diets as an indigestible marker for calculating the ileal CP and AA digestibility.

Results: The coefficients of variation (CV) of the content of crude fat (EE), crude fiber (CF), neutral detergent fiber (NDF), acid detergent fiber (ADF), and total glucosinolates (TGS) in 10 samples of rapeseed cake were greater than 10%. The standardized ileal digestibility (SID) of crude protein (CP), lysine (Lys), methionine (Met), threonine (Thr), and tryptophan (Trp) in rapeseed cake was 73.34% (61.49 to 81.12%), 63.01% (41.41 to 73.10%), 69.47% (50.55 to 88.16%), 79.61% (74.41 to 87.58%), and 94.43% (91.34 to 97.20%), respectively. The best prediction equations for SIDCP, SIDLys, and SIDVal were as follows: SIDCP = 90.124 - 0.54NDF (R2 = 0.58), SIDLys = 100.107 - 1.229NDF (R2 = 0.94), and SIDVal = 151.012 - 2.990TGS (R2 = 0.57).

Conclusion: Overall, great variation exists among the 10 rapeseed cakes, and the NDF, TGS, and heating temperature can be used as the key predictors for the SID of CP and AA.

Keywords: amino acids digestibility; prediction model; rapeseed cake.

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Conflict of interest statement

Author Z.X. was employed by the company Twins Group, Nanchang, China. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

Figure 1
Figure 1
Correlation coefficients (r) among physical characteristics, chemical constituents, and the SID of the first four limiting amino acids of the 10 rapeseed cake samples. * means significant difference (p < 0.05); ** means extremely significant difference (p < 0.01). SIDCP, SIDLys, SIDMet, SIDThr, SIDTrp, and SIDVal indicate the SID of CP, Lys, Met, Thr, Trp, and Val, respectively. DM, dry matter; GE, gross energy; CP, crude protein; EE, ether extract; Ash, crude ash; CF, crude fiber; NDF, neutral detergent fiber; ADF, acid detergent fiber; Ca, calcium; TP, total phosphorus; TGS, total glucosinolate; HT, heating temperature.
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