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Asian-Australas J Anim Sci > Volume 16(5); 2003 > Article
Animal Breeding and Genetics
Asian-Australasian Journal of Animal Sciences 2003;16(5): 714-718.
DOI: https://doi.org/10.5713/ajas.2003.714    Published online January 1, 2003.
The Effects of DL-methionine and DL-methionine Hydroxy Analogue on Growth Performance, Contents of Serum Amino Acids and Activities of Digestive Proteases in Broilers
J. J. Lu, C. W. Huang, R. G. R. Chou
Abstract
This study was conducted to determine the effect of DL-methionine (Met) and DL-methionine hydroxy analogue (MHA) supplementation on the growth performance, contents of serum amino acids and activities of digestive protease in broiler chicks from 0 to 3 weeks old . There were three treatments in this study: (1) control (basal diet), (2) 0.24% Met supplementation and (3) 0.368% MHA supplementation. The results showed that Met and MHA supplementation did not significantly (p>0.05) improve feed efficiency and body weight gain for broilers from 0-1, 0-2 and 0-3 weeks of age. The serum levels of homocystine, methionine and taurine were significantly (p<0.05) higher with supplementation of Met or MHA than with control. The pepsin activity of proventriculus was increased with (p<0.05) Met supplementation at 21 days of age and with MHA supplementation at 7 and 14 days of age. The trypsin activity was also increased (p<0.05) with MHA supplementation at 7 days of age. The chymotrypsin activity in pancreas and the dipeptidase activity in small intestinal mucosa and content were not affected (p>0.05) by Met or MHA supplementation.
Keywords: Methionine; Broiler; Growth Performance; Serum Amino Acids Pattern; Digestive Proteases


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