Methionine requirements of chickens with various body weights.

1. Prediction of the growth of young chicks was attempted by means of a computerised mathematical model, by fitting a 4 parameter kinetic equation (Mercer, 1982) to data obtained experimentally and from the literature. Amino acid antagonisms between arginine and lysine, and between branched-chain amino acids were taken into account. 2. In order to pool the data, dietary concentrations of essential amino acids were standardised by expressing as percentages of requirements according to Japanese Feeding Standard (1984), and growth responses were expressed relative to growth at or above this requirement. 3. The kinetic model gave an excellent fit (R2 = 0.92-0.99) to independent growth data obtained experimentally and from the literature, validating the use of the equation. 4. It was implied from predicted growth that the responses to alterations in dietary concentrations of different essential amino acids differed substantially, in a characteristic pattern, even when percentages of requirements were the same. 5. The validity of the model was tested against data that were not used in its construction. It was found that the simulation model could predict the growth of young chicks satisfactorily from dietary amino acid patterns.

show abstract

Growth prediction of young chicks: Do equal deficiencies of different essential amino acids produce equal growth responses?

Muramatsu

Ohshima

Goto

et al. 1991

British Poultry Science

View full text Add to dashboard Cite

show abstract

Amino acid requirements of poultry. A review.

Ishibashi¹

1990

Jpn. poult. sci.

View full text Add to dashboard Cite

Primary Experiments for Determination of Sulfur-Containing Amino Acid Requirement in Female Broilers Affected by Age.

et al. 1993

Self Cite

View full text Add to dashboard Cite

The effects of age on sulfur-containing amino acid (SAA) requirement of broilers were studied using body weight gains and feed conversion ratio as main criteria.In Experiment 1, the basal diet contained 20.7% of CP and 3371 kcal/kg of ME. Methionine was added in the range of 0 to 0.5% substituting for the same amount of glutamic acid to make 6 diets with graded levels of SAA. Broiler chicks aged 4 and 24 days old were fed ad libitum the experimental diet and water for 20 days. The body weight and feed intake were recorded on the 10th and 20th days on the experimental diet.In Experiment 2, the basal diet contained 18.6% of CP and 3175 kcal/kg of ME. Methionine was added to make 6 diets with graded levels of SAA by the same method as in Experiment 1. Broiler chicks aged 4 and 21 days old were fed ad libitum the experimental diet and water for 10 days. The body weight and feed intake were recorded on the 10th day.In Experiment 1, the body weight gain increased and then tended to decrease without a significant difference with the increase of methionine addition in all experimental periods. The maximum body weight gain was achieved at 1.14, 1.11 and 1.12% of dietary SAA levels from 4 to 14, 14 to 24 and 4 to 24 days, and 1.03, 0.99 and 1.00% of dietary SAA levels from 24 to 34, 34 to 44 and 24 to 44 days, respectively.The feed conversion ratio at the lowest SAA level did not fit to a linear line. Except this point, it decreased and reached the minimum level at 1.18, 1.08 and 1.10% of dietary SAA levels from 4 to 14, 14 to 24 and 4 to 24 days, and 1.05, 1.02 and 1.03% from 24 to 34, 34 to 44 and 24 to 44 days, respectively.In Experiment 2, the body weight gain and feed conversion ratio showed the same tendency as in Experiment 1. The maximum body weight gain was achieved at 0.97% from 4 to 14 days and at 0.89% from 21 to 31 days. The feed conversion ratio reached the minimum level at 0.97% from 4 to 14 days and at 0.93% from 21 to 31 days.The average requirements determined from body weight gain and feed conversion ratio decreased with increase of age in both experiments.(Jpn. Poult. Sci., 30: 31-39, 1993)

show abstract

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Methionine requirements of chickens with various body weights.

Cited by 4 publications

References 16 publications

Growth prediction of young chicks: Do equal deficiencies of different essential amino acids produce equal growth responses?

Growth prediction of young chicks: Do equal deficiencies of different essential amino acids produce equal growth responses?

Amino acid requirements of poultry. A review.

Primary Experiments for Determination of Sulfur-Containing Amino Acid Requirement in Female Broilers Affected by Age.

Contact Info

Product

Resources

About