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. 2021 Nov 23;57(3):253–261. doi: 10.1111/rda.14047

Influence of dietary L‐carnitine and lysine–methionine levels on reproductive performance and blood metabolic constituents of breeder ducks

Maryam Mirzaei 1, Mehrdad Bouyeh 1, Afshin Zahedi 2, Alireza Seidavi 1,✉, Rifat Ullah Khan 3, Vincenzo Tufarelli 4,✉, Vito Laudadio 4, Mohamed E Abd El‐Hack 5, Marco Ragni 6, Ayman E Taha 7, Ayman A Swelum 8,✉
PMCID: PMC9299044  PMID: 34787945

Abstract

The present study aimed to evaluate the influence of dietary supplementation of different levels of L‐carnitine and/or lysine–methionine (Lys‐Met) on reproductive performance of breeder ducks. Three L‐carnitine (0, 75 and 150 mg/kg) and three lysine–methionine (100%, 110% and 120% above the NRC (Nutrient requirements of poultry, 1994, National Academy Press) recommendations) levels were fed to 180 breeder ducks (144 females and 36 males) in a completely randomized design for 49 days. Laying performance and reproductive traits were evaluated; additionally, uric acid, total protein total, triglycerides, total cholesterol, low‐density lipoprotein, high‐density lipoprotein, aspartate aminotransferase (AST) and alanine aminotransferase (ALT) were assessed. The Lys‐Met above 100% NRC (Nutrient requirements of poultry, 1994, National Academy Press) recommendations with or without L‐carnitine improved feed utilization (p < .05). Furthermore, Lys‐Met above 100% recommendations without L‐carnitine improved egg fertility and hatchability. Fertility and hatchability improved in breeders fed on L‐carnitine with 120% Lys‐Met (p < .05). Serum glucose increased and total cholesterol reduced on 100% Ly‐Met without L‐carnitine or 110% Ly‐Met with 150 mg L‐carnitine (p < .05). Glucose was reduced, while total cholesterol increased on 75 mg L‐carnitine and 100% Lys‐Met (p < .05). Increasing Lys‐Met without L‐carnitine reduced serum protein (p < .05). Albumin and ALT increased on 75 mg L‐carnitine–100% Lys‐Met and reduced on 150 mg L‐carnitine–120% Lys‐Met (p < .05). There were no interaction effects on globulin, uric acid and AST (p > .05). Thus, based on findings, breeder ducks responded to dietary Lys‐Met more efficiently than L‐carnitine; however, more research is needed to evaluate also economic aspects related to L‐carnitine dietary supplementation.

Keywords: carnitine, duck, essential amino acids, reproduction, serum metabolites

1. INTRODUCTION

Although duck meat is becoming popular (Abd El‐Hack et al., 2019a; 2019b; Abo Ghanima, Abd El‐Aziz, et al., 2020; Abo Ghanima, Abd El‐Hack, et al., 2020; Farghly et al., 2018, 2019), the high fat content compared with other poultry species limits its acceptability by most consumers. Several dietary manipulations including addition of amino acids and metabolic intermediates are known to reduce abdominal fat and improve lean muscle depositions (Castro & Kim, 2020; Wu et al., 2011; Wu et al., 2021). Increasing dietary L‐methionine concentration significantly reduced abdominal fat content in ducks (Rehman et al., 2019; Xie et al., 2006), geese (Ashour et al., 2020; Wang et al., 2010) and broiler chickens (Andi, 2012). Moreover, Grisoni et al. (1991) and Attia (2003) reported significant reductions in abdominal fat and increased lean meat deposition with lysine supplementation in broiler chickens and ducks, respectively. These amino acids act mainly by suppressing lipogenesis through inactivation of fatty acid synthase and promotion of lipolysis by stimulating the secretion of hormone‐sensitive lipase (Alagawany et al., 2016; Reda et al., 2015; Takahashi & Akiba, 1995).

L‐carnitine is the biological active form of carnitine, synthesized endogenously from lysine and methionine. L‐carnitine regulates lipid and energy metabolism (Rehman, Chand, et al., 2017; Rehman, Naz, et al., 2017) by promoting mitochondrial β‐oxidation of long‐chain fatty acids (Abd El‐Wahab et al., 2015). Studies have shown that exogenous carnitine reduces the concentration of plasma, very‐low‐density lipoprotein cholesterol (VLDL‐C) and VLDL triglycerides (TG) in hyperlipidaemic rabbits and plasma lipoprotein levels in type 2 diabetic patients with hypercholesterolaemia (Rajasekar et al., 2005; Rehman et al., 2018). Plasma glucose concentration increased with carnitine supplementation due to increased fatty acid oxidation and subsequent decreased oxidation of gluconeogenic precursors (Greenwood et al., 2001). However, poultry have limited ability to synthesize carnitine in diets low in lysine and methionine. This has increased research interest in L‐carnitine supplementation of poultry diets. Supplementing diets with L‐carnitine was found to reduce carcass fat deposition in ducks (Arslan, 2006), but available reports on the effects on reproductive performance and blood metabolites of this species are still limited. Therefore, the present study investigated the effects of different dietary levels of L‐carnitine and lysine–methionine (Lys‐Met) on some reproductive traits and blood constituents of native breeder ducks.

2. MATERIALS AND METHODS

All the experimental procedures were carried out according to the approved protocols by the Institutional Animal Care and Use Committee (IACUC) of the Institutions, and care was followed to minimize the number of animals used.

2.1. Animals, management and treatments

The experiment was conducted at the Native Duck Rearing and Breeding Center, Fuman, Iran, and Rasht Branch, Islamic Azad University, Rasht, Iran. A total of 180 (144 ♀ and 36 ♂) native breeder Guilan ducks were weighed individually (1,740 ± 42.3 g) and divided into 36 groups of five birds (four ♀ and one ♂). Ducks were fed an isocaloric and isonitrogenous basal diet (Table 1) with different levels of L‐carnitine and lysine–methionine (Lys‐Met) in a 3 × 3 factorial experiment laid in a completely randomized design for 49 days.

TABLE 1.

Ingredient composition and calculated analysis of the experimental basal diet

Ingredients g/kg (as‐fed basis)
Corn 570.0
Soya bean meal (44% CP) 195.4
Wheat bran 125.0
Alfalfa meal 50.0
Oyster shell 39.3
Dicalcium phosphate 12.0
Vitamin–mineral premix a 4.0
Salt 2.5
Lysine hydrochloride 1.0
DL‐methionine 0.8
Calculated nutrients
Metabolizable energy (kcal/kg diet) 2,561
Crude protein 163.0
Crude fibre 46.0
Linoleic acid 16.0
Calcium (g/kg) 19.0
Available phosphorus 3.7
Methionine 3.3
Lysine 8.6
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a

Provide per kg diet: vitamin A: 5,000 IU/g; vitamin D3: 500 IU/g; vitamin E: 3 mg/g; vitamin K3: 1.5 mg/g; vitamin B2: 1 mg/g; calcium pantothenate: 4 mg/g; NIACIN: 15 mg/g; vitamin B6: 13 mg/g; Cu: 3 mg/g; Zn: 15 mg/g; Mn: 20 mg/g; Fe: 10 mg/g; K: 0.3 mg/g.

Their dietary treatments were as follows:

  1. L‐carnitine (0 mg/kg) and Lys‐Met (100% recommendations of NRC, 1994).

  2. L‐carnitine (75 mg/kg) and Lys‐Met (100% recommendations of NRC, 1994).

  3. L‐carnitine (150 mg/kg) and Lys‐Met (100% recommendations of NRC, 1994).

  4. L‐carnitine (0 mg/kg) and Lys‐Met (110% recommendations of NRC, 1994).

  5. L‐carnitine (75 mg/kg) and Lys‐Met (110% recommendations of NRC, 1994).

  6. L‐carnitine (150 mg/kg) and Lys‐Met (110% recommendations of NRC, 1994).

  7. L‐carnitine (0 mg/kg) and Lys‐Met (120% recommendations of NRC, 1994).

  8. L‐carnitine (75 mg/kg) and Lys‐Met (120% recommendations of NRC, 1994).

  9. L‐carnitine (150 mg/kg) and Lys‐Met (120% recommendations of NRC, 1994).

Birds were housed in floor pens measuring 200 × 200 cm2. The house temperature and relative humidity were maintained at 13°C and 55%–65%, respectively, throughout the experimental period. Feed and water were provided ad libitum during the experimental period. The lighting programme was 16 hr of light and 8 hr of dark throughout the duration of the study.

2.2. Laying performance and reproductive traits

Feed intake was monitored per pen as the difference between the quantities of fed and leftover. Eggs were recorded per pen, and percentage egg production was calculated as 100 × (eggs collected ÷ hens in the pen). All eggs produced were weighed using a digital portable scale (Jadever JKH‐500 series; SmartFox) sensitive to ±0.1 g, and the mean egg weight was recorded per pen. Feed conversion ratio (FCR) was calculated as g feed consumed to g egg produced.

Eggs collected were labelled per replicate and stored at 17°C and 74% relative humidity for 1 week. Eggs (68.7 ± 1.8 g) were candled and fertile ones incubated in the setter at 37.5°C and 60% humidity with regular turning for the first 25 days. On Day 25, eggs were transferred to the hatcher operated at 37°C and 71% relative humidity. At the end of 28 days of incubation, ducklings were removed and counted. Fertility and hatchability parameters were calculated as:

Fertility(%)=(numberoffertileeggs/numberoflaideggs)×100.
Hatchabilityoffertileeggs(%)=(numberofhatchedeggs/numberoffertileeggs)×100.

2.3. Blood biochemical constituents

On Day 49 of the trial, three representative birds per replicate were selected and blood samples (1 ml/bird) collected, from the wing vein, for biochemical analysis according to Jahanpour et al. (2013). Blood samples were transferred from the syringe into sample tubes coated with 10 mg of ethylenediaminetetraacetic acid (EDTA) and centrifuged at 1000 g × 20 min to ensure separation of the blood cells from the plasma. Plasma constituents were analysed following the standard protocols using the Roche Cobas Integra 400 Plus autoanalyzer (Roche Diagnostics GmbH). Uric acid, total protein total, TG, cholesterol, low‐density lipoprotein (LDL), high‐density lipoprotein (HDL), aspartate aminotransferase (AST) and alanine aminotransferase (ALT) were assayed using commercial kits (Teif Azmoon Pars, Co.).

2.4. Statistical analysis

Data were analysed using the GLM procedure of SAS software (SAS, 2000). The model included L‐carnitine and Lys‐Met as main effects. The interaction among main effects was included in the model. Means were compared using Duncan’s multiple range test and significance levels reported at 5% probability. The model used was as follows: Yijk  = μ + Ai  + Bj  + ABij  + eijk , where μ = the common mean, Ai  = the effects of the L‐carnitine, Bj  = the effect of the Lys‐Met, ABij = the effect of the ith A with the jth B, and eijk  = the random error. Before performing the statistical analysis, all data were tested by the normality test and transformed, if necessary.

3. RESULTS

3.1. Laying performance and reproductive traits

The results of laying performance and reproductive traits of the ducks (Table 2) showed no interaction effects on feed intake, hen‐day production, egg weight and egg mass of the ducks (p > .05). Dietary Lys‐Met above 100% of NRC (1994) recommendations with or without L‐carnitine improved FCR (feed: gain) of ducks (p < .05). In the main effects, neither L‐carnitine nor Lys‐Met level affected the performance parameters observed (p > .05).

TABLE 2.

Productive and reproductive performance of ducks fed different levels of dietary L‐carnitine and lysine–methionine

Treatments Feed intake (kg/5 ducks) Egg weight (g) Egg mass (kg/4 ducks) Hen‐day production (%) FCR Fertility (%) Hatchability (%)
Effect of adding different levels of L‐Carnitine (mg/kg)
L‐Carnitine 0 8.1 69 2.1 15.7 3.9 24.91 15.97
75 7.7 68.7 2.5 18.5 3.1 26.55 17.27
150 8.1 69.7 2.7 18.1 3 21.80 17.55
p‐Value .481 .571 .309 .419 .323 .094 .088
Effect of adding different levels of Lys‐Met (%)
Lys‐Met 100 8.1 70.1 1.5 10.7 5.4 10.44c 2.22c
110 7.9 68.5 2.3 16.8 3.4 19.08b 13.58b
120 7.9 68.8 3.6 24.7 2.2 43.75a 35.00a
p‐Value .243 .474 .391 .712 .233 .021 .017
Effect of interaction between adding different levels of L‐Carnitine and Lys‐Met
L‐Carnitine Lys‐Met
0 100 9.3 70.1 1.1 8 8.5a 10c 1.7c
110 7.8 67.8 1.8 13.9 4.3b 21ab 21.3ab
120 7.4 69.1 3.4 25.1 2.2de 43.8a 25ab
75 100 7.3 70.7 1.7 12.5 4.3b 14.7b 1.3c
110 7.8 68.1 2.6 19.8 3cd 20b 10.5b
120 8 67.4 3.1 23.2 2.6cd 45a 40a
150 100 7.7 69.5 1.6 11.6 4.8b 6.7c 3.7c
110 8.1 69.6 2.3 16.8 3.5bc 16.3b 9b
120 8.4 69.9 4.2 25.8 2e 42.5a 40a
SEM 0.350 1.18 0.112 1.61 0.341 5.603 1.078
p‐Value .117 .521 .673 .484 .041 .014 .039
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Mean values with different superscripts within the same column differ significantly (p < .05).

Abbreviation: SEM, standard error of the mean.

Egg fertility and hatchability indexes were significantly influenced by Lys‐Met and Lys‐Met interaction (p < .05). Feeding of Lys‐Met above 100% of NRC recommendations without L‐carnitine improved egg fertility and hatchability, but the addition of L‐carnitine (75 or 150 mg) improved fertility and hatchability only when Lys‐Met was increased to 120% of the NRC recommendations (p < .05). Based on the main effects, L‐carnitine addition did not affect the reproductive parameters (p > .05), but these were improved with increasing Lys‐Met above 100% of NRC recommendations (p < .05).

3.2. Metabolic parameters

The results of blood energy and protein metabolism parameters are presented in Tables 3 and 4, respectively. Serum glucose was increased and total cholesterol reduced by supplementing Lys‐Met at 100% without L‐carnitine or 110% with 150 mg L‐carnitine (p < .05). Feeding of diet with 75 mg L‐carnitine and 100% Lys‐Met reduced glucose and increased cholesterol (p <.05). There was no interaction effect on other energy blood metabolism parameters studied (p >.05). In the main effects, L‐carnitine did not affect any of the energy metabolism parameters (p > .05), but Lys‐Met level affected serum LDL content (p < .05). Increasing Lys‐Met level from 100% to 110% reduced LDL (p < .05), but by a further increase in Lys‐Met level to 120%, the decrease in LDL was not differed significantly compared with Lys‐Met level at 100% (p > .05). L‐carnitine or Lys‐Met had no effects on other energy metabolism parameters assessed (p > .05). Increasing Lys‐Met without L‐carnitine reduced serum total protein (p < .05), but this was restored with L‐carnitine addition. Higher serum albumin and ALT levels were found on ducks fed 75 mg L‐carnitine with 100% Lys‐Met and lower values on 150 mg L‐carnitine with 120% Lys‐Met (p < .05). There were no interaction effects on serum globulin, uric acid and AST (p > .05).

TABLE 3.

Energy metabolic parameters of ducks fed different levels of dietary L‐carnitine and lysine–methionine

Treatments Glucose (mg/dl) Total cholesterol (mg/dl) Triglycerides (mg/dl) HDL (mg/dl) LDL (mg/dl) HDL/LDL
Effect of adding different levels of L‐carnitine (mg/kg)
L‐Carnitine 0 170.4 184.3 356.2 56.5 71.2 1.8
75 166.2 220.8 418.4 57 83.8 0.9
150 175.8 198.9 367 36.3 73.4 1.8
p‐Value .418 .558 .931 .519 .929 .450
Effect of adding different levels of Lys‐Met (%)
Lys‐Met 100 170.8 229.5 630.9 56.5 126.3a 0.2
110 164.8 183 230.1 65.8 46b 2.2
120 176.7 191.4 280.5 57.5 56.2ab 2.1
p‐Value .300 .352 .062 .149 .021 .361
Effect of interaction between adding different levels of L‐carnitine and Lys‐Met
L‐Carnitine Lys‐Met
0 100 189.5a 144.5b 606 45.8 81 0.5
110 136c 224.3ab 99 88 69.8 1.1
120 185.7a 184b 363.5 55.8 72.8 0.8
75 100 151.3bc 328.3a 623 46.3 94.75 0.3
110 175.00ab 171.58b 218.0 82.25 73.8 0.9
120 172.3ab 162.5b 414.3 52.5 83 0.6
150 100 171.8ab 215.8ab 663.8 47.5 93 0.4
10 183.3a 153.3b 373.3 47.3 74.5 0.4
120 172.3ab 227.8ab 63.8 64.3 72.8 1.2
SEM 8.73 41.19 215.03 24.70 42.98 0.30
p‐Value .019 .01 .409 .484 .408 .440
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Mean values with different superscripts within the same column differ significantly (p <.05).

Abbreviation: SEM, standard error of the mean.

TABLE 4.

Protein metabolic parameters and hepatic functionality of ducks fed different levels of dietary L‐carnitine and lysine–methionine

Treatments Total protein (g/dl) Albumin (g/dl) Globulin (g/dl) Uric acid (mg/dl) AST (U/L) ALT (U/L)
Effect of adding different levels of L‐carnitine (mg/kg)
L‐Carnitine 0 5.2b 2.7 2.5 7.8 39.1 33.9
75 5.8a 3.2 2.6 9.2 37.1 37
150 5.3ab 2.8 2.4 9.3 47.1 42.8
p‐Values .028 .275 .969 .498 .706 .378
Effect of adding different levels of Lys‐Met (%)
Lys‐Met 100 5.7 3.3a 2.4 8 51.9 37.4
110 5.3 2.9ab 2.4 9 37.3 34.1
120 5.3 2.3b 2.7 9.23 34 32.3
p‐Values .169 .011 .752 .515 .334 .159
Effect of interaction between adding different levels of L‐carnitine and Lys‐Met
L‐Carnitine Lys‐Met
0 100 5.7abc 3.2ab 2.5 6.2 42.5 41.5ab
110 5.2c 2.4ab 2.7 9.2a 45 29.7b
120 4.7c 2.4ab 2.3 8 30.8 33.5ab
75 100 6.3a 3.8a 2.5 8.5 36.8 39.8a
110 5.2abc 2.7ab 2.5 10.5 40.5 36.8ab
120 5.8ab 3.2ab 2.6 8.7 34 34.5ab
150 100 5.1abc 2.9ab 2.1 9.4 36.5 91a
110 5.4abc 3.4ab 2 7.3 36.5 38.8ab
120 5.3abc 2.1b 3.2 11.2 38.3 29.8b
SEM 0.44 0.40 0.57 1.27 15.45 17.10
p‐Values .009 .015 .934 .350 .541 .015
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Mean values with different superscripts within the same column differ significantly (p < .05).

Abbreviation: SEM, standard error of the mean.

4. DISCUSSION

4.1. Laying performance and reproductive traits

The effects of dietary supplemental L‐carnitine, Lys and Met on poultry performance have been inconsistent. In fact, while some studies have reported improved performance, others found no significant effect. In the present study, increasing Lys‐Met above NRC recommendations with or without L‐carnitine improved feed efficiency, but L‐carnitine or Lys‐Met alone had no effects on feed utilization and egg production. These results partially agreed with those obtained by El‐kelawy, 2017; Rizk et al., 2019; Sigolo et al., 2019. In a previous study, Leibetseder (1995) also found no effect of dietary L‐carnitine (500 mg/kg) on laying performance of broiler breeders. These data might imply that the effects of L‐carnitine and Lys‐Met are additive rather than antagonistic. Both Lys and Met are essential for the synthesis of egg and body protein, and a shortage in either of these amino acids leads to a reduction in egg production (Hiramoto et al., 1990). L‐carnitine, which is mainly biosynthesized from Lys and Met (Abd El‐Wahab et al., 2015; Arslan, 2006), regulates β‐oxidation of fatty acids and prevents oxidative reactions by forming a defence line against reactive oxygen species (Arenas et al., 1998). A sufficient supply of L‐carnitine in the diet is therefore essential to provide for these functions and preserve Lys and Met from conversion to carnitine, making them available for tissue synthesis. Supplementation of low protein diets with carnitine in broiler chickens did promote growth in animals through its methionine‐sparing effect (Golrokh et al., 2016; Panahi et al., 2019; Tufarelli et al., 2020). Owen et al. (1996) also reported sparing of branched‐chain amino acids from oxidation in tissues with an increased supply of carnitine.

Improving egg fertility and hatchability can be achieved by increasing Lys‐Met alone above 100% of NRC recommendations or by the addition of L‐carnitine. This pattern further confirms the sparing effect of these amino acids from endogenous biosynthesis of carnitine. The beneficial effects of L‐carnitine on poultry fertility are documented. L‐carnitine increases sperm quantity and quality by protecting sperm against per‐oxidative damage and dysfunction (Alvarez & Storey, 1989). Active transporters in the epididymal lumen release circulating L‐carnitine into the lumen, which is controlled by androgens and delivered into spermatozoa, where it remains (Cooper, Gudermann, et al., 1986; Cooper, Yeung, et al., 1986; Enomoto et al., 2002; Jeulin & Lewin, 1996; Kobayashi et al., 2005). This coupled with the action of L‐carnitine on energy metabolism at cellular level, and its inhibition of apoptosis (Agarwal & Said, 2004; Balercia et al., 2005; Lenzi et al., 2003, 2004) could possibly explain its effects on reproductive cells. Ad libitum consumption of diets containing L‐carnitine at levels of 500 mg/kg (Neuman et al., 2002) or 125 mg/kg (Zhai et al., 2007) increased sperm concentration and reduced sperm lipid peroxidation in white leghorn roosters. Sarica et al. (2007) also reported a significant increase in sperm viability of mature male Japanese quail breeders supplemented with 250 or 500 mg L‐carnitine/kg diet. L‐carnitine supplementation also increased semen quantity and quality in broiler breeders (Golzar et al., 2007) and ostriches (Adabi et al., 2008). Several other authors (Leibetseder, 1995; Neuman et al., 2002; Rabie et al., 1997; Suchý et al., 2008) have also confirmed the beneficial effect of L‐carnitine on poultry reproduction. Dietary sulphur amino acid levels also improve egg quality (Narvaez‐Solarte, 1996), which influence egg storage and hatchability (Abd El‐Hack et al., 2019a; 2019b; Toro et al., 2015).

4.2. Metabolic parameters

We could not explain the pattern of energy and protein metabolism in this study, but a possible increase in fatty acid oxidation and the subsequently reduced oxidation of gluconeogenic precursors (Greenwood et al., 2001) could be a possible speculation. The available findings on Lys and Met supplementation alone or in combination with L‐carnitine on serum biochemical constituents in poultry are inconsistent. In opposition to our results, Arslan et al. (2004), Taraz and Dastar (2008) and Babak et al. (2015) found no effects of dietary levels of L‐carnitine and Lys‐Met on serum glucose and triglyceride concentrations in broiler chickens. Zhai et al. (2016) found no effects of Lys or Met levels on serum metabolites of male broilers from 21 to 42 days of age. Several factors including species of bird, age, diet composition and concentration of amino acids and carnitine may influence the response of poultry to Lys‐Met and L‐carnitine supplementation with regard to serum composition. The peculiarities in fatty acid composition of duck muscle (Ali et al., 2007) may also be implicated in the differences in serum composition observed between this study and those found in other poultry species.

5. CONCLUSION

It appears from the obtained findings that breeding ducks respond to Lys‐Met more efficiently than L‐carnitine. Increasing dietary Lys‐Met above NRC recommendations has no effect on egg production but improved feed utilization, egg fertility and hatchability. The pattern of the hens’ response in terms of serum metabolites is not consistent, and this needs further investigations. Because carnitine is biosynthesized endogenously from Lys‐Met, the supply of L‐carnitine in the diet will spare these essential amino acids. However, L‐carnitine is still a relatively expensive additive in many countries and there is a need to validate the cost‐effectiveness of its dietary inclusion. However, their availability, ease of use and their positive impact on ducks may make their use in duck feeds justified.

CONFLICT OF INTEREST

None of the authors have any conflict of interest to declare.

AUTHOR CONTRIBUTIONS

Maryam Mirzaei, Mehrdad Bouyeh, Afshin Zahedi and Alireza Seidavi conceptualized the study, contributed to methodology, validation and investigation, performed formal analysis and wrote the original draft. Alireza Seidavi, Rifat Ullah Khan, Vincenzo Tufarelli, Mohamed E. Abd El‐Hack, Ayman E. Taha and Ayman A Swelum performed investigation and data curation. Alireza Seidavi, Vincenzo Tufarelli, Marco Ragni, Vito Laudadio and Ayman A Swelum provided resources, performed funding acquisition and supervision, and wrote, reviewed and edited the manuscript.

ACKNOWLEDGEMENT

The authors gratefully acknowledge the financial support from Rasht Branch, Islamic Azad University (grant number 17.16.4.18418). Open Access funding provided by Universita degli Studi di Bari Aldo Moro within the CRUI‐CARE Agreement.

Mirzaei, M. , Bouyeh, M. , Zahedi, A. , Seidavi, A. , Khan, R. U. , Tufarelli, V. , Laudadio, V. , Abd El‐Hack, M. E. , Ragni, M. , Taha, A. E. , & Swelum, A. A. (2022). Influence of dietary L‐carnitine and lysine–methionine levels on reproductive performance and blood metabolic constituents of breeder ducks. Reproduction in Domestic Animals, 57, 253–261. 10.1111/rda.14047

Contributor Information

Alireza Seidavi, Email: alirezaseidavi@iaurasht.ac.ir.

Vincenzo Tufarelli, Email: vincenzo.tufarelli@uniba.it.

Ayman A. Swelum, Email: aymanswelum@zu.edu.eg.

DATA AVAILABILITY

The data that support the findings of this study are available upon request from the corresponding author.

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Data Availability Statement

The data that support the findings of this study are available upon request from the corresponding author.

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