Effects of dietary surpluses of methionine and lysine on growth performance, blood serum parameters, immune responses, and carcass traits of broilers

Antonio Gallo, Aldo Prandini, Samantha Sigolo, Ebrahim Deldar, Alireza Seidavi, Mehrdad Bouyeh

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

We evaluated the effects of dietary surpluses (100%, 110%, and 120% of Ross recommendations) of methionine (Met) and lysine (Lys) on growth performance, blood serum parameters, immune responses, and carcass traits of broilers using a completely randomized design with a 3 x 3 factorial arrangement. Broilers fed a diet containing Met and Lys according to Ross recommendations had maximal growth performance. During the starter period, higher Lys decreased intake of feed, energy, and protein (linear, P < 0.01) and weight gain (linear, P = 0.01). A diet with 110% Lys decreased feed efficiency (quadratic, P = 0.03) during the grower period and decreased the pre-slaughtered body weight (tendency; quadratic, P = 0.10), and increased serum uric acid (quadratic, P = 0.03). Dietary Lys level had an inverse correlation with serum phosphorus (linear, P = 0.02) and immune response against Newcastle disease virus after the first vaccination (linear, P = 0.03). There were Met x Lys interaction effects on serum glucose (P = 0.01), and relative weights of the rectum (P = 0.02) and liver (P = 0.02). Taken together, our results indicate that dietary surpluses of Met and Lys provided no additional benefits in broiler performance.
Original languageEnglish
Pages (from-to)146-153
Number of pages8
JournalJournal of Applied Animal Research
Volume47
DOIs
Publication statusPublished - 2019

Keywords

  • Amino acids
  • Anatomical parts
  • Antibody response
  • Carcass yield
  • Feed efficiency
  • Poultry

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