Pesti G M, Leclercq B, Chagneau A M, Cochard T
Station de Recherches Avicoles, Institut Nacional de la Recherche Agronomique, Nouzilly, France.
Poult Sci. 1996 Mar;75(3):375-80. doi: 10.3382/ps.0750375.
Full-sibling normal (na/na) and naked neck (Na/na) chickens were fed from 28 to 42 d of age on one of five diets with different SAA contents (from 5.4 to 7.0 g/kg). The experimental diets were made by adding DL-methionine to a well-balanced corn, soybean, and cornstarch diet containing 5.4 g SAA/kg and 161 g crude protein/kg. Dietary SAA influenced the growth rate of both genotypes similarly. There were no significant differences (P > 0.125) in body weight gain due to genetics or a diet by genetics interaction. Body weight gains were maximized at 6.24 +/- 0.45 (R2 = 0.171) and 5.96 +/- 0.52 g/kg SAA (R2 = 0.107) for the na/na and Na/na stocks, respectively. There was a significant SAA by genotype interaction for feed efficiency: the na/na birds were more efficient at low SAA levels, but the Na/na birds were more efficient at high SAA levels. Feather weight gain increased in a linear manner with increasing dietary SAA and was greater in na/na than Na/na birds with high dietary SAA concentrations. Abdominal fat decreased with increasing dietary SAA; and although the Na/na birds had significantly more abdominal fat than their na/na siblings (P = 0.049), on average the difference was small and complicated by differences in body weight. Analysis of covariance showed (a significant interaction) that the relationship between abdominal fat and body weight was different for the na/na and Na/na chickens. Although the shape of the response curves of na/na and Na/na chickens to dietary SAA are different, the quantitative requirements are very similar during the growing period.
全同胞正常（na/na）和裸颈（Na/na）鸡从28日龄至42日龄饲喂五种不同SAA含量（5.4至7.0 g/kg）的日粮之一。实验日粮是通过向含有5.4 g SAA/kg和161 g粗蛋白/kg的平衡玉米、大豆和玉米淀粉日粮中添加DL-蛋氨酸制成的。日粮SAA对两种基因型鸡的生长速度影响相似。由于遗传或遗传与日粮的相互作用，体重增加没有显著差异（P>0.125）。对于na/na和Na/na品系，体重增加分别在6.24±0.45（R2 = 0.171）和5.96±0.52 g/kg SAA（R2 = 0.107）时达到最大值。饲料效率存在显著的SAA与基因型相互作用：na/na鸡在低SAA水平下效率更高，但Na/na鸡在高SAA水平下效率更高。随着日粮SAA增加，羽毛重量呈线性增加，并且在高日粮SAA浓度下，na/na鸡的羽毛重量增加大于Na/na鸡。腹部脂肪随日粮SAA增加而减少；尽管Na/na鸡的腹部脂肪明显多于其na/na同胞（P = 0.049），但平均差异较小，且因体重差异而变得复杂。协方差分析表明（存在显著相互作用），na/na和Na/na鸡腹部脂肪与体重之间的关系不同。尽管na/na和Na/na鸡对日粮SAA的反应曲线形状不同，但在生长期间的定量需求非常相似。
