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Determination and prediction of the apparent and standardized ileal amino acid digestibility in cottonseed meals fed to growing pigs
Author(s) -
Ma Xiaokang,
Zhang Sai,
Shang Qinghui,
Long Shenfei,
Piao Xiangshu
Publication year - 2019
Publication title -
animal science journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.606
H-Index - 38
eISSN - 1740-0929
pISSN - 1344-3941
DOI - 10.1111/asj.13195
Subject(s) - cottonseed meal , zoology , cottonseed , chemistry , neutral detergent fiber , amino acid , chromatography , biochemistry , food science , biology , bran , dry matter , raw material , organic chemistry
This experiment was conducted to evaluate the chemical composition and apparent ileal digestibility ( AID ) and standardized ileal digestibility ( SID ) of amino acids ( AA ) in cottonseed meals ( CSM ) and to develop prediction equations for estimating AA digestibility for growing pigs based on the chemical composition and AA content of CSM . 10 CSM were collected from 10 provinces in China. 11 barrows (initial body weight: 34.4 ± 1.9 kg), fitted with an ileal T‐cannula, were allotted to 6 × 11 Youden square with 6 periods and 11 diets. The diets included one N‐free diet and 10 CSM test diets containing 40% CSM as the sole source of AA . The nitrogen‐free diet was used to measure the basal endogenous losses of CP and AA . The AID and SID for crude protein ( CP ), Lys, Met, Trp, and Thr among the 10 CSM differed ( p < 0.05). With R 2 values exceeding 0.30, significant linear regression equations for CP , Lys, and Thr were obtained. The best fit equations for predicting the AID and SID of Lys were: AID of Lys = 82.94–0.65 neutral detergent fiber, with R 2 = 0.44, residual standard deviation ( RSD ) = 4.03 and p = 0.04; and SID of Lys = 135.34–1.01 neutral detergent fiber + 34.27 Thr – 58.06 Trp – 84.93 Met, with R 2 = 0.90, RSD = 1.42 and p = 0.01. In conclusion, the results of AID , SID and prediction equations could be used to evaluate the digestibility of CSM in growing pigs.