title: Evaluation of sulphur amino acid requirement of male Korean native ducklings from hatch to 21 day of age.
abstract: 1. A dose-response experiment was conducted with male Korean native ducklings (KND) to evaluate the total sulphur amino acid (TSAA) requirement from hatch to 21 d of age. 2. A completely randomised design with 7 dietary TSAA concentrations (0.62%, 0.65%, 0.68%, 0.71%, 0.74%, 0.77% and 0.80%) were used with 6 replications per treatment. 3. Body weight (BW) and feed intake were measured weekly to calculate average daily gain (ADG), average daily feed intake (ADFI) and feed conversion ratio (FCR). One duckling per pen (n = 6) was killed by cervical dislocation to weigh empty body and drumsticks at the conclusion of experiment. 4. BW was improved significantly with increasing TSAA content, in a non-linear manner. A significant decrease of FCR was shown with increasing TSAA contents. TSAA requirement was determined by taking a mean value after fitting the data to both a linear-plateau and a quadratic-plateau model. Estimated TSAA requirements were 0.70%, 0.70%, 0.66% and 0.70% for the maximum BW, ADG and ADFI and for the minimum FCR, respectively. Increasing TSAA content improved quantity of full body weight (FBW), empty body weight (EBW) and drumstick weight (DSW), but there was no effect on proportion of DSW in relation to EBW and proportion of EBW to FBW. 5. In conclusion, the growth of male KND during 1 to 21 d of age was improved with increasing TSAA content, suggesting optimal TSAA requirements estimated by two analysis models.
authors.affiliation: a Department of Animal Science and Biotechnology , Chungnam National University , Daejeon 34134 , South Korea.
authors.forename: J
authors.initials: J
authors.lastname: Yoo
authors.affiliation: b Division of Biotechnology , Chonbuk National University , Iksan 54596 , South Korea.
authors.forename: Y J
authors.initials: YJ
authors.lastname: Yi
authors.affiliation: a Department of Animal Science and Biotechnology , Chungnam National University , Daejeon 34134 , South Korea.
authors.forename: S S
authors.initials: SS
authors.lastname: Wickramasuriya
authors.affiliation: a Department of Animal Science and Biotechnology , Chungnam National University , Daejeon 34134 , South Korea.
authors.forename: E
authors.initials: E
authors.lastname: Kim
authors.affiliation: a Department of Animal Science and Biotechnology , Chungnam National University , Daejeon 34134 , South Korea.
authors.forename: T K
authors.initials: TK
authors.lastname: Shin
authors.affiliation: a Department of Animal Science and Biotechnology , Chungnam National University , Daejeon 34134 , South Korea.
authors.forename: H M
authors.initials: HM
authors.lastname: Cho
authors.affiliation: a Department of Animal Science and Biotechnology , Chungnam National University , Daejeon 34134 , South Korea.
authors.forename: N
authors.initials: N
authors.lastname: Kim
authors.affiliation: a Department of Animal Science and Biotechnology , Chungnam National University , Daejeon 34134 , South Korea.
authors.forename: J M
authors.initials: JM
authors.lastname: Heo
mesh_terms: D000603:Amino Acids, Sulfur / Q000378:metabolism*; D000821:Animal Feed / Q000032:analysis; D000818:Animals; D004032:Diet / Q000662:veterinary; D004305:Dose-Response Relationship, Drug; D004372:Ducks / Q000235:genetics / Q000254:growth & development / Q000502:physiology*; D004734:Energy Metabolism; D008297:Male; D009751:Nutritional Requirements; D011897:Random Allocation; D015430:Weight Gain
chemical_list: D000603:Amino Acids, Sulfur
keywords: Korean native ducklings; linear-plateau model; quadratic-plateau model; total sulphur amino acids