Effect of Different Levels of L-carnitine and Excess Lysine-Methionine on Broiler Performance, Carcass Characteristics, Blood Constituents, Immunity and Triiodothyronine Hormone

Vincenzo Tufarelli, Hooman Mehrzad-Gilmalek, Mehrdad Bouyeh, Ali Qotbi, Hossein Amouei, Alireza Seidavi, Erwin Paz and Vito Laudadio
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Vincenzo Tufarelli: Department of DETO, Section of Veterinary Science and Animal Production, University of Bari ‘Aldo Moro’, Valenzano, 70010 Bari, Italy
Hooman Mehrzad-Gilmalek: Department of Animal Science, Rasht Branch, Islamic Azad University, Rasht 41335-3516, Iran
Mehrdad Bouyeh: Department of Animal Science, Rasht Branch, Islamic Azad University, Rasht 41335-3516, Iran
Ali Qotbi: Department of Animal Science, Rasht Branch, Islamic Azad University, Rasht 41335-3516, Iran
Hossein Amouei: Department of Animal Science, Rasht Branch, Islamic Azad University, Rasht 41335-3516, Iran
Alireza Seidavi: Department of Animal Science, Rasht Branch, Islamic Azad University, Rasht 41335-3516, Iran
Erwin Paz: Laboratory of Animal Production, Faculty of Agriculture and Forestry, Universidad de La Frontera, Temuco 01145, Chile
Vito Laudadio: Laboratory of Animal Production, Faculty of Agriculture and Forestry, Universidad de La Frontera, Temuco 01145, Chile

Agriculture, 2020, vol. 10, issue 4, 1-8

Abstract: The influence of dietary L-carnitine and lysine (Lys)-methionine (Met) levels on productive performance, haematology and triiodothyronine hormone levels of broilers was investigated. Dietary treatments included different L-carnitine (0, 50 and 100 mg/kg) and Lys-Met (0%, 10% and 20% over National Research Council (NRC) (1994) recommendation levels), under a 3 × 3 factorial design arrangement. From the findings, the body weight (BW) gain, feed intake and feed conversion ratio (FCR) of broilers were significantly ( p < 0.05) influenced by dietary treatments in the different growing stages. Conversely, carcass yield and organs did not differ ( p > 0.05) among treatments, whereas meat-cuts varied significantly when broilers were fed experimental diets. Moreover, the dietary inclusion of the highest levels of amino-acids (L-carnitine (100 mg/kg) and Lys-Met (+20%)) produced a reduction ( p < 0.05) of blood uric acid, also leading to the highest triiodothyronine (T3) hormone levels. Based on the obtained results, it can be concluded that the combination of extra levels of L-carnitine associated with Lys-Met positively influenced the performance traits in broiler chickens.

Keywords: diet; broiler; amino acids; diet; thyroxin; meat (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2020
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