A comparison of enzyme preparations to liberate folic acid for the microbiological assay of feed ingredients

Ryu, Kyeong Seon; Eitenmiller, Ronald R.; Pesti, G. M.

doi:10.1002/jsfa.2740640322

Cited by 11 publications

(4 citation statements)

References 12 publications

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“…This discrepancy has two sources. First, the improved method we use detects more folic acid in any particular ingredient sample than did earlier methods (De Souza and Eitenmiller, 1990;Ryu et al, 1994). Second, earlier experiments on the folic acid requirements of broiler chickens were conducted with higher levels of methionine than we employed (Saxena et al, 1954;Chiao and Stokstad, 1977).…”

Section: Discussionmentioning

confidence: 98%

The Folic Acid Requirements of Starting Broiler Chicks Fed Diets Based on Practical Ingredients.

Ryu¹,

Pesti²,

Roberson³

et al. 1995

Poultry Science

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Two experiments were conducted to determine the effects of dietary supplemental folic acid and methionine on the performance of starting broiler chicks for 18 d. Four levels of dietary folic acid (.24, .54, 1.14, and 2.34 mg/kg) and four levels of dietary methionine (.45, .53, .61, and .69%) were fed in a factorial design. There were three replicates of eight chicks each per each treatment. The basal diet was based on corn, isolated soybean protein, meat and bone meal, and fish meal. It contained adequate amounts of all nutrients except methionine and folic acid. Increased growth was observed in chicks fed the basal diet supplemented with either folic acid or methionine. Total dietary folic acid and methionine plus cysteine requirements for maximum growth were estimated to be 1.80 mg/kg and .85% in Experiment 1 and 1.47 mg/kg and .87% in Experiment 2, respectively. There were interactions between dietary folic acid and methionine on weight gain in both experiments. Chicks fed the diet containing 2.34 mg folic acid/kg tended to have depressed growth, as in previous experiments. There was a significant linear feed conversion response to folic acid in Experiment 1 and to methionine in Experiment 2. There were both linear and quadratic liver folic acid responses to dietary folic acid in both experiments. There was no indication that dietary methionine had any effect on liver folic acid content. No differences in bone ash, hemoglobin, hematocrit, or incidence of tibial dyschondroplasia were detected due to methionine or folic acid supplementation.

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Section: Discussionmentioning

confidence: 98%

The Folic Acid Requirements of Starting Broiler Chicks Fed Diets Based on Practical Ingredients.

Ryu¹,

Pesti²,

Roberson³

et al. 1995

Poultry Science

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show abstract

“…Folic acid (Merck Co. Ltd, Darmstadt, Germany) was added to the test diets at the expense of cellulose to provide concentrations of 0.0, 0.3, 0.6, 1.0, 3.0, 6.0, 10.0 and 20.0 mg/kg diet. Folic acid concentration of the eight diets were determined with a microbiological assay using Lactobacillus casei (NTCC 10940) at the Food Industry Research and Development Institute (Hsinchu, Taiwan) according to the procedure of Ryu et al 6 The determined values are 0.06 (unsupplemented control), 0.37 (0.3 mg/kg), 0.69 (0.6 mg/kg), 1.16 (1.0 mg/kg), 3.22 (3.0 mg/kg), 6.31 (6.0 mg/kg), 10.42 (10.0 mg/kg) and 21.48 (20.0 mg/kg). The diets were prepared and stored as described elsewhere 7 …”

Section: Methodsmentioning

confidence: 99%

“…At the end of the feeding trial, fish were weighed and the percent weight gain and feed efficiency were calculated as described elsewhere 8 . After the final weighing, three fish were randomly removed from each aquarium, and samples from their livers were removed and pooled for folic acid determination 6 . Three other fish were then taken randomly from the remaining fish of each aquarium for blood analysis.…”

Section: Methodsmentioning

confidence: 99%

Dietary folic acid requirement for maximum growth of juvenile tilapia Oreochromis niloticus x O. aureus

Shiau

Huang

2001

Fisheries Sci

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A feeding trial was conducted to estimate the dietary folic acid requirement of juvenile tilapia, Oreochromis niloticus×O. aureus. Purified basal diets with eight levels (0.0, 0.3, 0.6, 1.0, 3.0, 6.0, 10.0, 20.0 mg/kg diet) of supplemental folic acid were fed to tilapia (mean initial weight 0.41 ± 0.01 g) for 8 weeks. Each diet was fed to three replicate groups of fish reared in a closed recirculating system. Results indicated that weight gain and feed efficiency (FE) were significantly (P < 0.05) greater in fish fed ≥1.0 mg folic acid/kg diet than fish fed 0.3 mg folic acid/kg diet or the unsupplemented control diet. Mortality of fish was not affected by dietary treatment. Hepatic folic acid concentration increased with an increase in dietary folic acid and values were significantly higher in fish fed ≥6.0 mg folic acid/kg diet than fish fed the control diet. An analysis of the weight gain percentage by broken‐line regression indicates that the adequate dietary folic acid requirement in juvenile tilapia is 0.82 mg/kg diet.

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“…The basal diets were supplemented with six Folic acid levels (0, 0.5, 1, 2, 4 and 8 mg/ kg diet) at the expense of small amounts of cellulose. The dietary folic acid concentrations in the six diets were analyzed by using Lactobacillus casei (ATCC 7469) by the procedure of Ryu et al (1994) to be 0.04 (0 mg/kg), 0.52 (0.5 mg/kg), 1.05 (1 mg/kg), 2.21 (2 mg/kg), 4.32 (4 mg/kg), 7.95 (8 mg/kg), respectively. The analyzed proximate compositions of formulated feeds are given in Table 1 ( AOAC, 1995).…”

Section: Feed Ingredients and Preparationmentioning

confidence: 99%

Effects of different levels of dietary folic acid on the growth performance, muscle composition, immune response and antioxidant capacity of freshwater prawn, Macrobrachium rosenbergii

2016

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A comparison of enzyme preparations to liberate folic acid for the microbiological assay of feed ingredients

Cited by 11 publications

References 12 publications

The Folic Acid Requirements of Starting Broiler Chicks Fed Diets Based on Practical Ingredients.

The Folic Acid Requirements of Starting Broiler Chicks Fed Diets Based on Practical Ingredients.

Dietary folic acid requirement for maximum growth of juvenile tilapia Oreochromis niloticus x O. aureus

Effects of different levels of dietary folic acid on the growth performance, muscle composition, immune response and antioxidant capacity of freshwater prawn, Macrobrachium rosenbergii

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