Methionine is an essential nutrient for poultry. In
addition, this amino acid provides methyl groups, which
are needed for several metabolic reactions such as the
synthesis of carnithine and creatine (Schutte et al.,
1997). Methionine is considered to be the first limiting
amino acid in broilers fed practical corn-soybean meal
diets. Adequate dietary level of this amino acid is
needed to support optimum growth and carcass yield of
fast-growing commercial broilers (Ojano-Dirain and
Waldroup, 2002). Many poultry nutritionists use the
levels recommended by the National Research Council
(NRC, 1994) as a guideline in establishing their own
amino acid requirements, regardless of location and
environmental conditions. A limitation of using the NRC
recommendations in warm weather feeding is that these
levels are derived primarily from studies conducted in
thermoneutral environments and do not indicate
possible differences in amino acid needs due to
environmental temperatures. Since very little information
is available on the amino acid needs of broilers raised
in warm environments, nutritionists confronted with
warm weather feeding generally add margins of safety
to the NRC levels (Ojano-Dirain and Waldroup, 2002).
Although the NRC also suggests increasing the amino
acid levels in warm environments to compensate for the
expected reduction in feed intake, the NRC noted that
this adjustment should be exercised with caution since
some studies have indicated that minimizing excesses
of dietary crude protein (Austic, 1985) and amino acids
Methionine is an essential nutrient for poultry. Inaddition, this amino acid provides methyl groups, whichare needed for several metabolic reactions such as thesynthesis of carnithine and creatine (Schutte et al.,1997). Methionine is considered to be the first limitingamino acid in broilers fed practical corn-soybean mealdiets. Adequate dietary level of this amino acid isneeded to support optimum growth and carcass yield offast-growing commercial broilers (Ojano-Dirain andWaldroup, 2002). Many poultry nutritionists use thelevels recommended by the National Research Council(NRC, 1994) as a guideline in establishing their ownamino acid requirements, regardless of location andenvironmental conditions. A limitation of using the NRCrecommendations in warm weather feeding is that theselevels are derived primarily from studies conducted inthermoneutral environments and do not indicatepossible differences in amino acid needs due toenvironmental temperatures. Since very little informationis available on the amino acid needs of broilers raisedin warm environments, nutritionists confronted withwarm weather feeding generally add margins of safetyto the NRC levels (Ojano-Dirain and Waldroup, 2002).Although the NRC also suggests increasing the aminoacid levels in warm environments to compensate for theexpected reduction in feed intake, the NRC noted thatthis adjustment should be exercised with caution sinceบางการศึกษาได้ระบุว่า ย่อหน้า excessesอาหารโปรตีนหยาบ (Austic, 1985) และกรดอะมิโน
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