What the study found
The study found that wheat samples varied in their chemical makeup and in standardized ileal amino acid digestibility, which is the amount of amino acid digested before the end of the small intestine. The authors report that chemical properties of wheat can be used to build prediction equations for pullets during both brooding and growing periods.
Why the authors say this matters
The authors say this matters because wheat is a major alternative to corn in layer diets, and better prediction of amino acid digestibility supports more precise feed formulation. They conclude that these equations provide a tool for rapid and accurate evaluation of the amino acid nutritional value of wheat in pullets.
What the researchers tested
The researchers evaluated 10 wheat samples from different sources for physical properties, conventional nutrient components, amino acid profiles, and standardized ileal amino acid digestibility. They fed 594 pullets during brooding and 396 pullets during growing to 11 diet groups, including a nitrogen-free diet and test diets in which wheat was the sole amino acid source, with titanium dioxide as an indigestible indicator.
What worked and what didn't
The chemical components of the wheat samples showed considerable variation, and the digestibility values of the 15 analyzed amino acids differed significantly among samples. During brooding, most amino acid digestibility values were significantly correlated with gross energy, crude ash, ether extract, or calcium, and with methionine, histidine, and tryptophane; during growing, most were correlated with gross energy, crude ash, acid detergent fiber, total phosphorus, and those essential amino acids.
What to keep in mind
The abstract does not describe limitations beyond the fact that the work was conducted in Jingfen No.8 pullets and in two age periods: brooding (days 28-31) and growing (days 92-95). The summary also does not provide the full prediction equations, only their reported fit statistics.
Key points
- Ten wheat samples from different sources showed considerable variation in chemical composition.
- Standardized ileal digestibility values for 15 amino acids differed significantly among wheat samples.
- Most amino acid digestibility measures were correlated with different chemical properties in brooding and growing pullets.
- Seventeen prediction equations were developed for each period.
- The best brooding-period model was for serine with R² = 0.869.
- Four growing-period equations had R² values greater than 0.80.
Disclosure
- Research title:
- Wheat digestibility equations were developed for pullets
- Authors:
- Shiqian Liu, Kaiyue Ren, Chong Chen, Tong Xing, Liang Zhao, Liren Ding, Feng Gao, Lin Zhang
- Institutions:
- Nanjing Agricultural University, Nanjing Agricultural University, Nanjing Agricultural University, Nanjing Agricultural University, Nanjing Agricultural University, Nanjing Agricultural University, Nanjing Agricultural University, Nanjing Agricultural University
- Publication date:
- 2026-03-03
- OpenAlex record:
- View
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