The Effect of Dietary Protein Level and Total Sulfur Amino Acid:Lysine Ratio on Egg Production Parameters and Egg Yield in Hy-Line W-98 Hens

Abstract

A 3 x 3 treatment arrangement varying in dietary protein and TSAA:Lys was used to evaluate the effect of low-protein diets fed to Hy-Line W-98 laying hens. Phase I was 20 to 43 wk of age with 18.9, 17.0, and 14.4 g of protein/hen per day and 0.97, 0.85, and 0.82 TSAA:Lys, whereas phase II was 44 to 63 wk of age with 16.3, 14.6, and 13.8 g of protein/hen per day and 0.92, 0.82, and 0.72 TSAA:Lys. Egg production and feed consumption decreased from 83.7 to 82.2% and 98.8 to 95.6 g, respectively. Feed efficiency improved from 1.680 to 1.645 g of feed/g of egg mass with decreasing dietary protein. Body weight gain was similar for hens fed high or medium protein diets. In phase II, hens consuming 13.8 g of protein/day had significantly reduced egg weight compared with hens consuming 14.6 or 16.3 g of protein/day. Wet and dry albumen percentage, albumen solids, and albumen and yolk protein percentages were significantly decreased with feeding low-protein diets. Yolk protein percentage was increased from 14.85 to 15.11% when decreasing the ratio from 0.97 to 0.82. Hens consuming a low-protein diet produced eggs with the lowest specific gravity. An interaction was observed for protein retention during phase I, feeding 14.4 g of protein/day or a ratio of 0.97 improved protein retention by 9 and 16%, respectively. Overall, hens consuming 16.3 or 14.6 g of protein/hen per day performed similar to hens consuming 18.9 and 17.0 g of protein/hen per day during P1 and P2, respectively. Also, hens consuming diets containing 0.97 and 0.92 TSAA:Lys produced eggs with improved shell quality as compared with other ratios during P1 and P2, respectively.

Lysine and zinc chelate in diets for brown laying hens: effects on egg production and composition

“…Similarly, did not obtain differences in yolk protein by increasing the concentration of the same amino acid in the diet. However, the current result agrees with Novak et al (2006), who observed an inverse relationship when reduced the amino acid in the diet, and reported increasing of protein content, according to reduction of dietary lysine concentration.…”

“…Increasing zinc in the diet resulted in a reduction of 21% in mineral deposition. As noted by Park et al (2004) and Hudson et al (2005), in excess, zinc has detrimental effect on egg production, affecting the absorption of nutrients, and causing lesions in the pancreas and gizzard of laying hens. The greatest apparent need of lysine, under high concentration of zinc in the diet, does not correspond to increased efficiency in the use of amino acid by the bird, and then the absorption is probably affected, as shown by the data on production and egg composition.…”

“…The reduction in egg weight due to increased dietary zinc suggests a lower efficiency of nutrient absorption, as pointed out by Hudson et al (2005) on the performance of chickens from 0 to 17 days of age. This adverse effect was suggested by Park et al (2004), in a review of the zinc role on poultry nutrition, indicating that the excess of this mineral has a negative effect on feed intake and egg production, causing lesions in the pancreas and gizzard of laying hens.…”

Requirement of Digestible Sulfur Amino Acids in Laying Hens Fed Sorghum- and Soybean Meal-Based Diets

“…Methionine is the first limiting AA in hens fed corn-or sorghum-and soybean meal-based diets (Cortes et al, 2001;Novak et al, 2006;Saki et al, 2012). An important aspect of the Met requirement is that this AA and Cys contain sulfur in their structure, and within the body, under conditions of deficiency of Cys, Met can be used to synthesize one molecule of Cys.…”

Effects of Different Levels of Dietary Crude Protein on Egg Production and Quality in Laying Hens during Early Stage of Egg Production

“…이와는 다르게 Roberts et al (2007) (Karunajeewa, 1972;Masahiro et al, 1999;Morihiro et al, 2001), 많은 연구에서 xanthophyll 함량이 높을수 록 난황 내 더욱 많은 색소들이 침착되어 짙은 색을 보인다 고 하였다 (Karunajeewa, 1972;Liu et al, 2004;Prochaska et al, 1996). 또한, 옥수수는 대체로 20∼25 mg의 xanthophyll 을 함유하고 있으며 (Sikder et al, 1998) (Khajali et al, 2007;Novak et al, 2006;신 등, 1989). 그러 나 난각 두께 및 강도를 제외한 전반적인 난각 품질에 있어 서 조단백질 수준이 낮을수록 품질이 떨어진다는 보고도 있 으며, 이것은 사료 내 TSAA : Lys 비율 차이에 기인한 것이 라 하였다 (Keshavarz and Nakajima, 1995;Keshavarz and Jackson, 1992;Leeson and Caston, 1997 …”