Based on the BW gain and feed efficiencies from experiment
1, it could be concluded that 15% DDGS may be used
safely in commercial (high-density) diets. However, the
lower feed efficiency (gain:feed) observed during the first
7 d and the numeric reduction thereafter suggest that an
inclusion level of 15% DDGS may be excessive during the
starter period. These assumptions were confirmed by the
results of experiment 2, in which 12 and 18% DDGS depressed
chick performance during the starter period.
Soybean protein is known to have a more favorable
amino acid pattern for chick growth than corn. When 18%
DDGS was incorporated into the diet, the percentage protein
of corn origin doubled (4.6 to 8.6%), whereas the percentage
protein from soybean meal (SBM) decreased. It is
believed that at 18%DDGS, the high level of dietary protein
of corn origin and the corresponding decrease in soybean
protein may have contributed to the depressed performance
due to a marginal lysine deficiency. The estimated
lysine value (0.94%) of DDGS used in the diet formulation
was higher than the analyzed value (0.85%). The depressed
performance observed at the higher inclusion levels was
likely due to the overestimation of lysine in DDGS and
decreases in the level of soybean protein, the main lysine
source in the diet, resulting in a marginal lysine deficiency.
At lower inclusion levels of DDGS, there appeared to be
sufficient lysine from the soybean protein and thus no
negative effect due to the overestimation of the lysine concentration
was observed. Amarginal lysine deficiency may
also explain the growth depressing effect of DDGS in the
more sensitive low-density diet fed in experiment 1. Our
results seem to agree with those of Hughes and Hauge
(1945), who observed that when DDGS was used as the
sole source of protein in a broiler diet there was a marginal
deficiency of lysine, causing a slight decrease in performance.
Based on the BW gain and feed efficiencies from experiment1, it could be concluded that 15% DDGS may be usedsafely in commercial (high-density) diets. However, thelower feed efficiency (gain:feed) observed during the first7 d and the numeric reduction thereafter suggest that aninclusion level of 15% DDGS may be excessive during thestarter period. These assumptions were confirmed by theresults of experiment 2, in which 12 and 18% DDGS depressedchick performance during the starter period.Soybean protein is known to have a more favorableamino acid pattern for chick growth than corn. When 18%DDGS was incorporated into the diet, the percentage proteinof corn origin doubled (4.6 to 8.6%), whereas the percentageprotein from soybean meal (SBM) decreased. It isbelieved that at 18%DDGS, the high level of dietary proteinof corn origin and the corresponding decrease in soybeanprotein may have contributed to the depressed performancedue to a marginal lysine deficiency. The estimatedlysine value (0.94%) of DDGS used in the diet formulationwas higher than the analyzed value (0.85%). The depressedperformance observed at the higher inclusion levels waslikely due to the overestimation of lysine in DDGS anddecreases in the level of soybean protein, the main lysinesource in the diet, resulting in a marginal lysine deficiency.At lower inclusion levels of DDGS, there appeared to besufficient lysine from the soybean protein and thus noผลกระทบจาก overestimation ของไลซีนความเข้มข้นได้ดำเนินการ อาจขาดไลซีน Amarginalนอกจากนี้ยัง อธิบายการเจริญเติบโต depressing ผลของ DDGS ในการเลี้ยงอาหารนความหนาแน่นต่ำมีความไวมากในการทดลอง 1 ของเราผลลัพธ์ดูเหมือนจะ เห็นด้วยกับสตีเฟ่นและ Hauge(ค.ศ. 1945), ที่สังเกตที่เมื่อมีใช้ DDGS เป็นแหล่งเดียวของโปรตีนในอาหารไก่เนื้อมีมาเป็นกำไรร่างกายขาดแอล-ไลซีน ทำให้ลดประสิทธิภาพลงเล็กน้อย
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