Methionine requirement of male White Pekin ducklings

Two experiments were conducted to determine the methionine (Met) requirement of male White Pekin ducklings. In each study, day-old ducklings were raised in electrically heated battery brooders and fed a corn-peanut meal basal diet (dry mash) supplemented with either 0, .06, .12, .18, .24, or .30% L-...

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Bibliographic Details
Published in:Poultry science 1986-09, Vol.65 (9), p.1771-1776
Main Authors: Elkin, R.G, Stewart, T.S, Rogler, J.C
Format: Article
Language:English
Subjects:
ACIDE AMINE
ACIDE URIQUE
ACIDO URICO
AMINO ACIDS
AMINOACIDOS
ANALISIS ESTADISTICO
ANALYSE STATISTIQUE
ANIMAL MALE
ANIMALES MACHO
Animals
Animals, Newborn
BESOIN NUTRITIONNEL
CANARD
COMPOSE ORGANOSOUFRE
COMPUESTO ORGANICO DEL AZUFRE
DUCKS
Ducks - metabolism
GAIN DE POIDS
GANANCIA DE PESO
Male
MALE ANIMALS
METHIONINE
Methionine - metabolism
METIONINA
NECESIDADES DE NUTRIENTES
NUTRITIONAL REQUIREMENTS
ORGANOSULPHUR COMPOUNDS
PATO
STATISTICAL ANALYSIS
URIC ACID
WEIGHT GAIN
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Summary:Two experiments were conducted to determine the methionine (Met) requirement of male White Pekin ducklings. In each study, day-old ducklings were raised in electrically heated battery brooders and fed a corn-peanut meal basal diet (dry mash) supplemented with either 0, .06, .12, .18, .24, or .30% L-Met. Based on the analysis of corn and peanut meal, the basal diet contained 22% crude protein .268% Met, and .284% cystine (Cys). The energy content of the basal diet was calculated to be 2914 kcal ME/kg. Regression analysis of 12- day weight gain data pooled across experiments indicated a quadratic trend. When the quadratic model was solved for 95% of maximum growth, a Met requirement of .422% was predicted (r2 = .49). Analysis of the pooled weight gain data by the broken-line method yielded a requirement estimate of .382% (r2 = .50). Therefore, the duckling's calculated Met requirement most likely lies between .382 and .422% (.666 and .706% total sulfur amino acids, respectively). This .04% discrepancy between models for predicting the duckling's Met requirement is probably of minor practical significance, considering the variability of Met and Cys contents of feedstuffs and the fact that corn-soy diets are usually supplemented with a source of Met activity that includes a margin of safety.
ISSN:0032-5791
1525-3171
DOI:10.3382/ps.0651771