@article{MAKHILLIJTM202015420009,
    title = {The Efficacy of using Herbal Methionine Instead of DL-Methionine in Broiler Diets: Study on
Production Performance and Costs},
    journal = {International Journal of Tropical Medicine},
    volume = {15},
    number = {4},
    pages = {74-79},
    year = {2020},
    issn = {1816-3319},
    doi = {ijtmed.2020.74.79},
    url = {https://makhillpublications.co/view-article.php?issn=1816-3319&doi=ijtmed.2020.74.79},
    author = {Hamidreza},
    keywords = {DL-methionine,herbal methionine,performance,carcass,production cost,broiler chickens},
    abstract = {In order to evaluate using herbal methionine
instead of synthetic methionine in feed for broiler
chickens and its influence on performance indicators,
carcass yield and production cost, an experiment was
conducted with 500 Ross broiler chicks within 40 days.
The birds were classified in 5 groups including lack of
methionine dietary (control), diets containing 0.1 and
0.2% of herbal methionine, 4 repeats and each repetition
25 birds were selected randomly. At the end of starter,
grower and finisher periods, indexes of weight gain, feed
intake and feed conversion ratio have been investigated.
Moreover, 2 birds of each iteration of the carcass in the
main parts were tested in the fortieth day after weighing
and slaughter. The cost of production and profit from each
feeding group were also assessed with the numerical
calculations at the end of each period. The results showed
that herbal methionine has been ineffective or reducing
significantly for the indexes of weight gain and feed
intake in all periods. On the contrary, the level of
synthetic methionine causes increase of weight and
increase or equality in average feed consumption. In feed
conversion ratio index, levels of herbal methionine have
been identical or increasing in comparison with control
group. In all periods, synthetic methionine has increased
the indexes. Chicken breast weight did not change with
different herbal methionine. This behavior was observed
in synthetic methionine but synthetic methionine
increases breast weight significantly in comparison to
herbal methionine. Abdominal fat has also been
reduced by both methionine source but this reduction
was more in herbal methionine (p<0.01). The weight
ratio of liver reduced for both methionine sources
(identically) in comparison to control group. The results
of studying production costs indicate that none of the
herbal methionine consumption levels has the economic
justification and the positive profit balance in comparison
to synthetic methionine. This balance was even
lower than the group lacking methionine. Accordingly,
substitution of herbal methionine with synthetic
methionine is not proper in fodder for broiler chickens.}
    }