Volume 4, Issue 3 (2002)                   JAST 2002, 4(3): 111-117 | Back to browse issues page

‎ 20.1001.1.16807073.2002.4.3.8.2

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Zaghari M, Shivazad M, Kamyab A, Nikkhah A. Digestible Lysine Requirement of Arian Male and Female Broiler Chicks During Six to Twenty-one Days of Age. JAST 2002; 4 (3) :111-117
URL: http://jast.modares.ac.ir/article-23-12118-en.html
Digestible Lysine Requirement of Arian Male and Female Broiler Chicks During Six to Twenty-one Days of Age
M. Zaghari * 1, M. Shivazad1 , A. Kamyab1 , A. Nikkhah1
1- Department of Animal Science, College of Agriculture, Tehran University, Islamic Republic of Iran.
Abstract:   (7742 Views)
An experiment was conducted to determine the dietary digestible lysine requirement of male and female broiler chickens (Arian) during the period from 6 to 21 days post-hatching. An amino acid-fortified basal diet containing corn and soybean meal as intact protein sources provided 20 % CP, and 3200 kcal AMEn / kg. In this experiment 150 male and 150 female chicks were allocated on the basis of BW to 12 treatments in a factorial arrangement (two sexes at six digestible lysine levels) with five replications of five chicks each in a completely randomized design (CRD). The digestible lysine levels fed were 0.85, 0.95, 1.05, 1.15, 1.25 and 1.35%. The growth rate and feed efficiency of birds fed the basal diet fortified with a surfeit level of l-Lysine-HCl were equal to those of birds fed a corn-soybean meal positive control diet. Average body-weight gain (ABWG) and gain: feed (GF) responded quadratically (P<0.05) to incremental dietary lysine addition. Subjecting the growth data to broken-line analysis indicated that the digestible lysine requirement for maximum body weight gain was 1.075% for males and 1.049% for females. The lysine requirement for maximum feed efficiency was 1.179% for males and 1.149% for females. Male chicks required a higher level of dietary lysine than females for both maximal ABWG and GF. Regardless of sex, 8.8% more digestible lysine (percentage of diet) was required for maximal GF than that needed for maximal ABWG.
Keywords: Digestible amino acid, Broiler chickens, Lysine requirement
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Received: 2010/02/10 | Accepted: 2010/02/10 | Published: 2010/02/10
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