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摘要:
Validated procedures play an important role to obtain accurate information about individual amino acid requirement data. The aim of the present study was to assess lysine (Lys) requirement of growing chicken both by classical supplementation technique and principles of diet dilution technique as applied with “Goettingen approach”. During the starter period (1 - 21 d), a growth study with male meat type chicken (Ross 308) was conducted making use of five graded dietary Lys-levels (3 repetition boxes with 3 birds/box). L-Lys×HCl was gradually added to a diet based on wheat, soybean protein concentrate, wheat gluten and fishmeal to yield 80%, 87.5%, 95%, 102.5% and 110% of the expected requirement level (13 g Lys/kg as fed). Diets were iso-energetic (12.8 MJME/kg) and iso-nitrogenous (21.65% crude protein). Birds were fed on free choice level also to assess the feed intake (FI) effects as important factor on traditional response criteria. Analyzed body composition at start and end of the growth study yielded N deposition (ND) data for further data assessment using exponential approximations depending on dietary Lys content or observed Lys intake. The results indicated significant differences (p < 0.05) in response on body weight gain (BWG) and observed dietary protein quality with unexpected consequences for the derived Lys requirement data. According to the independent variable (Lys in % of diet versus daily Lys intake) and aimed level of daily ND, the needed in-feed content of Lys varied between 1.24% and 1.46%. Application of the exponential modelling by “Goettingen approach” overcame these misleading conclusions by modelling the relationship between required Lys intake and observed response data (BWG, ND) taking also into account the expected real feed intake to formulate the needed in-feed concentration.
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篇名 Assessing Lysine Requirement of Growing Chicken by Direct Comparison between Supplementation Technique and “Goettingen Approach”
来源期刊 动物科学期刊(英文) 学科 医学
关键词 GROWING CHICKEN LYSINE Requirement Supplementation TECHNIQUE Diet DILUTION TECHNIQUE N Utilization Model Amino Acid Efficiency
年,卷(期) 2017,(1) 所属期刊栏目
研究方向 页码范围 56-69
页数 14页 分类号 R73
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节点文献
GROWING
CHICKEN
LYSINE
Requirement
Supplementation
TECHNIQUE
Diet
DILUTION
TECHNIQUE
N
Utilization
Model
Amino
Acid
Efficiency
研究起点
研究来源
研究分支
研究去脉
引文网络交叉学科
相关学者/机构
期刊影响力
动物科学期刊(英文)
季刊
2161-7597
武汉市江夏区汤逊湖北路38号光谷总部空间
出版文献量(篇)
381
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0
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