A Chick Bioassay for Lysine

Hill, D. C.; Singh, Jyoti; Ashton, G. C.

doi:10.3382/ps.0450554

Cited by 9 publications

(2 citation statements)

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“…Reported lysine availability values have ranged from 76 to 110% (Robel and Frobish, 1977;Netke and Scott, 1970;Hill et al, 1966;Kelly and Scott, 1966;Combs etal, 1965;Ousterhout et al, 1959;Gupta et al, 1958). Baker (1978) attributes the differences to protein level, amino acid balance, delayed release of amino acids from intact protein as opposed to ready availability of crystalline amino acids, caloric density of the diet, area of the growth curve used, and assay methodology used.…”

Section: Introductionmentioning

confidence: 98%

Relationships Between Color, Trypsin Inhibitor Contents, and Urease Index of Soybean Meal and Effects on Broiler Performance

1981

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Three experiments were conducted to determine the relationships between trypsin inhibitor contents, urease index, and color of soybean meal, and the effect on broiler performance. Either 0, 8, 10, 12, 14, or 16% moisture (Experiment 1) or 0, 2, 4, 6, 8, or 10% moisture (Experiment 2) was added after dehydrating raw, flaked, solvent-extracted soybeans to 2% moisture. Each sample was then sealed in .473-liter jars, autoclaved for 0 to 135 min, with 15-min intervals, and dried at 37 C in a vacuum oven to remove all remaining moisture. In Experiment 3 commercial soybean meal with 12.12 /ig trypsin inhibited/mg protein (Mg/mg) was autoclaved for 0 to 25 min with 5-min intervals to determine the effect of additional heat on broiler performance and SBM color.Commercial soybean meal with 12.12 Mg/mg trypsin inhibitor, tristimulus +a color value of 3.21, and a urease index of .19 A pH supported poorer growth and feed efficiency in broilers than the same soybean meal heated an additional 10 min and, thus, 1.77 Mg/mg trypsin inhibitor, a + a color value of +4.76, and urease index of .02 A pH. Results indicated that color is a good predictor of trypsin inhibitor content and broiler performance. Additional heating resulted in higher +a color values and poorer broiler performance, indicating that color may also be used to determine overprocessing.Particle size of the soybean meal influenced the color. The soybean meal ground to pass a 20 mesh screen supported the best broiler performance when tristimulus color values ranged from +4.5-5.5 ±a color values or 58-65 L color values. These results confirm that color is a quick and reliable method of determining soybean meal quality. (

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Section: Introductionmentioning

confidence: 98%

Relationships Between Color, Trypsin Inhibitor Contents, and Urease Index of Soybean Meal and Effects on Broiler Performance

1981

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“…O'DELL and SAVAGE (14) reported that the addition of 1.2% arginine to a sesame diet with limited lysine caused growth depression in chicks, but not when the diet was adequate in lysine. HILL et al (20,21) also noted in chicks a similar effect from excess arginine added to a diet first limited in lysine. The mechanism by which excess lysine increases need for arginine in the chick has been extensively studied, and some investigators have suggested that the induction of kidney arginase by excess lysine is responsible in part for the possible mechanism (15,16,(22)(23)(24).…”

Section: Discussionmentioning

confidence: 85%