Article

Methionine and cystine requirements of slow- and fast-feathering male broilers from zero to three weeks of age

Auburn University, Poultry Science, Auburn, Alabama 36849, USA.
Poultry Science (Impact Factor: 1.67). 10/2003; 82(9):1423-7. DOI: 10.1093/ps/82.9.1423
Source: PubMed

ABSTRACT

Two experiments were conducted with fast- (Ross x 3F8) and slow- (Ross x 308) feathering broiler males from 0 to 3 wk of age
to determine Met and Cys requirements. A corn-soybean meal basal diet was formulated to be deficient in Met and Cys but was
adequate in all other nutrients (22.0% CP; 3,050 kcal ME/kg). In experiment 1, diets contained 0.50% dietary Cys with 0.35,
0.40, 0.45, and 0.50% total Met. Feed conversion (FC) of slow- and fast-feathering males improved in a similar manner to 0.50%
Met (linear, P < 0.05). Nitrogen retention measured from 20 to 21 d of age optimized at 0.46% Met (quadratic, P < 0.01), regardless
of feathering rate. Experiment 2 examined the response to feeding 0.35, 0.40, 0.45, and 0.50% total Cys in diets having total
Met at 0.45%. Increasing Cys improved FC that optimized at 0.40% with fast-feathering birds (quadratic, P < 0.01), whereas
slow-feathering broilers were not responsive. Nitrogen retention measured from d 20 to 21 did not indicate a difference attributable
to feathering but a Cys optimization at 0.43% with both broiler sources. Present experimentation indicates a Met requirement
approximating 0.50% is appropriate for broilers 0 to 3 wk of age, regardless of feather rate; however, the estimated Cys requirement
for slow-feathering males (0.39%) was less than for fast-feathering (0.44%) males.

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    • "Unexpectedly, the feed conversion ratio was even slightly lower in the control groups without methionine supplementation than in the groups supplemented with 0.05% of either DLM or MHA. This finding is in disagreement with other studies performed with ducks, broilers, or turkeys showing that the feed conversion ratio is normally worse or at least unchanged at an insufficient supply of methionine (Boling and Firman, 1997; Chamruspollert et al., 2002; Lemme et al., 2002; Kalinowski et al., 2003; Xie et al., 2006; Jamroz et al., 2009). In order to assess the bioefficacy of MHA in comparison to DLM we subjected performance data to a linear fixed-effects model and to an exponential model. "
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    • "due to Lys deficiency may decrease the Lys requirement in the present study. Using RSM, the dMet requirement was estimated at 0.54 and 0.53% of the diet for BW gain and FCR, respectively, which is slightly higher than that found byKalinowski et al. (2003). Among the first 3 essential amino acids, the Lys requirement had the greatest reduction due to posthatch starvation, demonstrating the utmost importance of Lys early in life. "
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