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South African Journal of Animal Science

versão On-line ISSN 2221-4062
versão impressa ISSN 0375-1589

S. Afr. j. anim. sci. vol.42 no.2 Pretoria Jan. 2012

 

Effect of in ovo injection with L-arginine on productive and physiological traits of Japanese quail

 

 

H.J. Al-Daraji#; A.A. Al-Mashadani; W.K. Al-Hayani; A.S. Al-Hassani; H.A. Mirza

University of Baghdad, College of Agriculture, Department of Animal Resources, Baghdad, Iraq

 

 


ABSTRACT

This study evaluated the influence of administering different levels of L-arginine into eggs of 0-day-old Japanese quail embryos. On day 0 of incubation, 480 eggs (120 for each treatment group) were injected with 0% arginine (C group), 1% arginine (T1), 2% arginine (T2) or 3% arginine (T3). After hatching, 336 quail chicks (84 chicks produced from each in ovo injection treatment) were placed in an experimental quail house and allocated to four treatment groups of three replicates, with 16 quail chicks for each replicate. Traits involved in this study were hatchability rate, initial body weight (7 days of age), final body weight (42 days old), feed intake, weight gain, feed conversion ratio and blood serum glucose, protein, cholesterol, total lipids, triglycerides, calcium and phosphorus concentrations, and proportional weights of the carcass, breast, legs, backbone, wings, neck, abdominal fat, liver, heart and gizzard. Results revealed that in ovo injection with different levels of L-arginine on day 0 of incubation resulted in significant increases in the hatchability rate, initial body weight, final body weight, feed conversion ratio, and blood serum glucose, protein, total protein, calcium and phosphorus concentrations, as well as the proportional weights of the carcass, breast, legs, liver, heart and gizzard. However, there was no significant difference in feed intake between treatment groups. Significant decreases were recorded in blood serum cholesterol, total lipids and triglyceride concentrations, and proportional weights of the backbone, wings and abdominal fat. In conclusion, the inoculation of different levels of L-arginine into eggs of 0-day-old quail embryos, especially at the levels of 2% and 3% arginine, resulted in a significant improvement in the productive and physiological performance of the quail. Hence in ovo injection with L-arginine could be used as a tool for enhancing the hatchability rate and productive performance of quail hatched from the egg.

Keywords: Coturnix coturnix japonica, egg, incubation, in ovo fed avian neonate, nutrition


 

 

Introduction

Various factors play important roles in birds in influencing hatchability efficiency and growth performance during embryonic and post-hatch life, such as genetic make-up, egg characteristics and incubation environment (Narushin & Romanov, 2002; Petek et al., 2003; Abiola et al., 2008). Hatching drastically changes the way chicks retrieve nutrients. In the embryo, yolk lipids are transported directly into the blood by endocytosis (dos Santos et al., 2010), but after hatching, the yolk content is absorbed through both the yolk sac membrane and the Meckel's diverticulum, and is digested and absorbed from the intestinal tract. At hatch the energy reserves in the yolk sac may not be sufficient to supply in the maintenance energy requirements of a chick (Dibner et al., 1998), and fasting effects may develop before the bird is removed from the hatchery. However, despite being capable of ingesting feed, the intestinal tract of the chick is still immature (Uni et al., 2003). Ohta et al. (1999) reported that the injection of an amino acid mixture into growing embryos in broiler breeder eggs resulted in a higher body weight at hatch and at 56 d of age compared with chick from control embryos. Ohta et al. (2001) suggested that the increase in hatching weight of 7-day-old embryos injected with amino acids may have been owing to a higher content of amino acids in the yolk or the better utilization of amino acids by the embryo. Foye et al. (2006) observed a higher body weight, and thigh and breast weights in day-old turkeys when they were inoculated at 23 d of incubation with egg-derived protein. Arginine is a basic amino acid, and is classified as conditionally essential. One of its main functions is its participation in protein synthesis. Arginine is involved in a number of other metabolic functions in the body, such as its potential to be converted to glucose (hence its classification as a glycogenic acid), and its ability to be catabolized to produce energy (Tong & Barbul, 2004). Arginine is utilized in a number of metabolic pathways that produce a variety of biologically active compounds, such as nitric oxide, creatine, agmatine, glutamate, polyamines, ornithine and citrulline (Wu & Morris, 1998).

Al-Murrani (1978) suggested that differences in protein content of eggs at days 0 and 7 of incubation could affect the growth of embryos. In addition, the administration of vitamin D precursor into eggs has been done from day 0 of incubation in Japanese quail (Elaroussi et al., 1993). If amino acid administration is possible before incubation, it may be advantageous. Owing to the importance of hatchability and early post hatch growth on the market size of birds, a study was undertaken to examine the effect of in ovo injection of L-arginine on hatchability, productive performance, carcass traits and physiological performance of Japanese quails (Coturnix coturnix japonica).

 

Materials and Methods

An experiment was conducted utilizing 480 fertilized commercial eggs of Japanese quail. All eggs were obtained from the same breeder flock and were laid within a 24-hour period. These eggs were randomly allocated to four treatment groups of 120 eggs each, such that the weight distribution profile among the four treatment groups was identical. Through in ovo supplementation, L-arginine was administered to the fertile eggs on day 0 of incubation. The in ovo injection solutions were 0% L-arginine (sterile distilled water; control group); 1% L-arginine (1 g L-arginine/100 mL sterile distilled water; T1); 2% arginine (2 g L-arginine/100 mL sterile distilled water; T2); 3% L-arginine (3 g arginine/100 mL sterile distilled water; T3). L-arginine was provided by Qualikems Fine Chemicals Pvt, Ltd (5531, Basti Harphool Singh, Sadar Thana Road, Delhi-06). A hole was incised using an automatic needle (Figure 1), and 0.5 mL of the L-arginine solutions was injected at a depth of about 15 mm into the air cell using a 23-gauge needle. The injection site was disinfected with 70% ethanol before and after injection, sealed with nail paint (Figure 2) and transferred to incubating baskets in an incubator to complete the hatching process.

 

 

 

 

After 18 d of incubation, hatched quail chicks were removed from the incubator to determine hatchability rate. The chicks were then transported to an experimental house. The day-old chicks (336 chicks; 84 chicks from each in ovo injection treatment) were evenly distributed into the same treatment groups (four in ovo injection treatments) with three replicates per group and 28 chicks per replicate. For six weeks (duration of experiment) the quails were fed a diet containing 210 g protein/kg and 12.08 MJ metabolizable energy/kg. The quail were allowed free access to food and water and housed in wire cages containing 28 quails each. A regimen of 17 h constant lighting and continuous ventilation was provided, and all birds were kept under uniform management conditions throughout the experimental period.

Production traits measured in this study were initial body weight (7 days old), final body weight (42 days of age), feed intake, body weight gain and feed conversion ratio. The latter three traits were determined weekly and the data presented as a total mean for the whole experimental period (6 weeks).

At the end of experiment, blood samples were collected from 18 birds in each treatment (6 birds from each replicate). Blood was collected from the jugular vein (Al-Daraji et al., 2008) to ensure a free flow. A pooled blood sample for each replicate per treatment was analysed for serum chemistry traits. After overnight clotting at 4 °C, the samples were centrifuged for 20 min at 4000 x g. The separated serum was transferred to a laboratory and was analysed for glucose, total protein, cholesterol, total lipids, triglycerides, calcium and phosphorus concentrations. Blood traits measured in this study were analysed according to the standard methods as reported by Al-Daraji et al. (2008).

On day 42 after hatching, feed was withdrawn overnight from all birds to facilitate gut clearance. After that the birds were weighed to obtain live body weight. The birds were then slaughtered, defeathered and processed (removal of gastrointestinal tract). The carcasses were stored at 4 °C for 24 h, and then weighed. The carcasses were dissected and the weights of the liver, heart, gizzard, breast, legs, backbone, wings, neck and abdominal fat were obtained to determine the relative percentages of these carcass components.

Statistical analysis was carried out using a complete randomized design (Steel & Torrie, 1980). These data were subjected to ANOVA according to GLM procedure of SAS software (SAS, 2000). The significant differences among means were determined by using Duncan's multiple range test. Differences among treatment means were compared at P <0.05.

 

Results and Discussion

The effects of in ovo injection with different amounts of arginine at 0 day of age on hatchability rate are presented in Table 1. In ovo injection with 1%, 2% or 3% L-arginine increased (P <0.05) the hatchability rate compared with the control. However, there was no significant difference in hatchability rate between T2 and T3. Initial body weight (7 days of age) and final body weight (42 days), as well as feed intake, weight gain and feed conversion from hatching to 6 weeks as affected by in ovo injection with arginine, are shown in Table 1. Results revealed that chicks produced from eggs injected with L-arginine, especially at levels 2% and 3%, were heavier (P <0.05) in body weight at day 7 and at 6 weeks and showed higher weight gains (P <0.05) from hatch to 6 weeks than those produced from the eggs in the control. The best results of feed conversion during 0 - 6 weeks were realized in chicks hatched from eggs injected with L-arginine (P <0.05) compared with those hatched from control eggs. Treatment had no effect on feed intake between 0 and 6 weeks. Furthermore, there were no differences between T2 and T3 concerning initial body weight, final body weight or weight gain, while the T3 group had an improved feed conversion. Serum glucose, total protein, cholesterol, total lipids, triglycerides, calcium and phosphorus concentrations of chicks at 6 weeks differed (P <0.05) in the various treatments (Table 2).

Chicks produced from eggs injected with L-arginine showed significant increases (P <0.05) in serum glucose, protein, calcium and phosphorus concentrations and significant decreases (P <0.05) in serum cholesterol, total lipids and triglyceride concentrations compared with those hatched from control eggs. On the other hand, there were no significant differences between T2 and T3 for all blood serum traits included in this study.

Significant (P <0.05) differences were observed between treatments in carcass traits and relative weight of certain organs (Table 3). The overall means of carcass weight (%) and the proportional weights of the breast, legs, liver, heart, and gizzard were higher (P <0.05) in chicks hatched from eggs injected with L-arginine compared with chicks produced from the control group. Moreover, chicks produced from eggs inoculated with L-arginine recorded the lowest means regarding relative weights of backbone, wing, neck and abdominal fat compared with those hatched from control eggs. However, there were no significant differences between T2 and T3 in carcass characteristics and organ weight.

When quail eggs were injected with L-arginine, the best results obtained in this study were recorded in productive performance, blood serum traits and carcass traits and the weights of some organs compared with those of the control treatment. This may be because arginine stimulates the secretion of the growth hormone. Campbell et al. (2004) reported that it is well documented that the infusion of arginine stimulates growth hormone secretion from the anterior pituitary. This increase in growth hormone secretion has been attributed to the suppression of endogenous somatostatin secretion (Alba-Roth et al., 1988). Darras et al. (1990; 1992) indicated that during embryonic growth, liver cells are capable of responding to the growth hormone by converting T4 to T3 and decreasing type III iodothyronine deiodinase. Moreover, hepatocytes derived from chick embryos respond to growth hormone with an increased insulin-like growth factor by continuous infusion or daily injections, and had significant beneficial effects on growth and carcass composition in young chicken (Burke et al., 1987; Cravener et al., 1989). The growth hormone exerts a broad spectrum of effects, which result in somatic growth and maintenance of fuel homeostasis. These effects include reduction in lipid synthesis, enhanced growth and protein synthesis, alterations of carbohydrate metabolism, increased levels of calcium, phosphorus, protein, glucose in blood, stimulated erythrocyte synthesis and cellular differentiations (Harvey & Etches, 1997). Chevalley et al. (1998) and Flakoll et al. (2004) reported that arginine supplementation resulted in significant improvements in growth criteria and physiological performance. The in ovo fed avian neonate may have a greater capacity to digest and absorb nutrients from an exogenous diet relative to the conventional hatchling (Foey et al, 2007). Previous in ovo feeding experiments (Tako et al., 2004) demonstrated that in ovo injection of the leucin metabolite P-hydroxyl-β-methyl-butyrate had a 45% increase in jejunal villus surface area at hatch in comparison with the controls. Another possible growth potential of arginine is its role in the synthesis of creatine. Arginine, glycine and methionine are the three amino acids involved in the synthesis of creatine. Creatine has been shown to increase muscular growth and strength (Vandenberghe et al., 1997) and muscle fibre size (Volek et al., 1999). On the other hand, arginine is a precursor of the cell-signing molecule nitric oxide. Nitric oxide acts as a signalling molecule to facilitate the dilation of blood vessels and decrease vascular resistance. Nitric oxide is synthesized from arginine under the enzymatic control of nitric oxide synthase. Muscle growth and functions regulated by nitric oxide or related molecules include force production (excitation-contraction coupling), auto regulation of blood flow, myocyte differentiation, respiration and glucose homeostasis (Stamler & Meissner, 2001). Contractile activity and muscle growth greatly increase nitric oxide production in the muscle, and this is probably because of elevated intracellular calcium (Kobzik et al., 1994).

 

Conclusion

It can be concluded from this study that the in ovo injection of L-arginine especially at the levels of 2% and 4% on 0 d of incubation would improve hatchability rate, productive performance, carcass traits and some organ weights and certain blood serum characteristics. Therefore, in ovo injection of L-arginine at 0 day old could be used as an efficient tool to improve the productive performance of Japanese quail.

 

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# Corresponding author: prof.hazimaldaraji@yahoo.com

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