Efficiency of ozone compared to commercial sanitizers for hatching eggs from older breeders

ABSTRACT.

This study aimed to evaluate the potential of ozone as a sanitizer compared to commercial sanitizers for hatching eggs stored in hatching machines using different turning systems. The eggs (n = 120) were distributed in a completely randomized design using a factorial scheme (6x2) where the treatments were constituted by different sanitizers applied (non-treated eggs, Ozone 1.6 mg L^-1, Ozone 3.2 mg L^-1, Cyphenothrin, UVC, and paraformaldehyde) and two turning systems (vertical and horizontal) with 10 eggs each, with the egg considered as a replicate. Data collected were subjected to the Tukey test at 0.05. We observed a very similar performance in the incubation yield results of the hatching machines with different turning systems, where the hatching percentage of eggs stored in the hatching machine using vertical turning presented better (p < 0.05) results. Comparing ozone to other sanitizers, we observed that paraformaldehyde and UVC provided better (p < 0.05) hatching percentage. However, both ozone concentrations used also presented good hatching percentage results. Chicks from treated eggs, except those from eggs treated with the highest ozone concentration (3.2 mg L^-1), were heavier (p < 0.05) at hatch. Chicks from eggs treated with the low concentration of ozone (1.6 mg L^-1) presented, in several scenarios, higher (p < 0.05) weight at hatch than chicks from eggs treated with sanitizers commonly used, especially paraformaldehyde and UVC. Conclusively, ozone can be used as a sanitizer to treat eggs from older breeders, presenting potential to replace commonly used sanitizers stored in hatching machines using both vertical and horizontal turning systems.

Keywords:
chicks; incubation; paraformaldehyde; poultry; sanitization

Introduction

The biosecurity of fertile eggs involves their sanitation from the moment they are collected in the nest to their storage in the hatching machine, aiming to maintain the embryo's security against potential microorganisms that could compromise its development (Oliveira, Santos, Nascimento, & Rodrigues, 2020a). Disinfection procedures for fertile eggs are crucial in preventing the spread of bacteria, especially from broiler breeder flocks to their offspring (Spickler, Buhr, Cox, Bourassa, & Rigsby, 2011; Clímaco et al., 2018). The embryo yolk sac and neonatal chicks are primarily at risk of contamination in the laying environment due to bacteria that can colonize the eggshell and enter the egg through its pores (Clímaco et al., 2018). Therefore, efficient disinfection can reduce egg contamination and, consequently, enhance the incubation capacity, quality, growth, and performance of the chicks (Araújo & Albino, 2011; Oliveira et al., 2020a; Oliveira, Santos, Rodrigues, & Nascimento, 2020b).

Hatching eggs in the poultry industry are commonly sanitized using paraformaldehyde fumigation to reduce potentially pathogenic microorganisms (Rui, Angrimani, Cruz, Machado, & Lopes, 2011; Kusstatscher, Cernava, Liebminger, & Berg, 2017). However, it is proven that this product causes adverse effects in the embryos and is harmful to the health of the farm and hatchery professionals (Zeweil, Rizk, Bekhet, & Ahmed, 2015; Kusstatscher et al., 2017). It is also important to mention that, for several years, disinfection of hatching eggs has been considered a problem for the poultry industry due to the absence of an economical, effective, and safe alternative to formaldehyde fumigation (Clímaco et al., 2018).

In this scenario, research is necessary to ensure effective methods for fertile egg sanitization, considering the high probability of eggshell contamination after laying, as well as bird health care, poultry litter quality, and the correct egg collection procedures (Wells, Coufal, Parker, & McDaniel, 2010). Currently, among the available alternative technologies, ozone is a promising one, which has proven its efficacy and usefulness over the years with its widespread application in the treatment of water and food (Miller, Silva, & Brandão, 2013). Studies have reported the ozone potential to combat microbial contaminations because of its very rapid action and strong oxidative characteristics, presenting fast auto-decomposes into molecular oxygen and leaving no hazardous halogenated compounds (Pandiselvam, Chandrasekar, & Thirupathi, 2017; Pandiselvam et al., 2019).

Even at very low concentrations, ozone can exhibit a remarkable sanitizing capacity (Pandiselvam et al., 2019). Ozone has the unique ability to destroy a wide range of microorganisms, even at relatively low concentrations, thus effectively meeting the global demand for sustainable sanitization (Miller et al., 2013; Pandiselvam et al., 2019). Another notable advantage of using ozone for sanitization is its potential for on-site generation. Ozone generators can efficiently produce ozone using oxygen as the source gas (Nakamura, Oya, Hanamoto, & Nagashio, 2017). This on-site generation eliminates the need for storing hazardous chemicals, an essential safety consideration (Pandiselvam, Thirupathi, & Anandakumar, 2015). In addition to these benefits, ozone treatment boasts an energy-efficient profile. Compared to other sanitization methods like radiation, microwave, and thermal treatment, the energy input required for ozone treatment is significantly lower (Khadre, Yousef, & Kim, 2001). This energy efficiency contributes to both cost savings and reduced environmental impact.

The applications of ozone as a sanitizer in the food industry and other agroindustry areas have been extensively reviewed in the literature (Berrang, Cox, Frank, Burh, & Bailey, 2000; Braun, Fernandez, & Fuhrmann, 2011; Karaca & Velioglu, 2014; Yüceer, Aday, & Caner, 2016; Glowacz & Rees, 2016; Gonçalves, 2016). However, this study seeks to focus on its applications as a sanitizer for hatching eggs, aiming to enhance their incubation performance in comparison to other commonly employed sanitizers within the poultry industry. By exploring the unique benefits and capabilities of ozone in this specialized context, this study endeavors to shed light on its suitability and effectiveness in optimizing the incubation process (Clímaco et al., 2018). The poultry industry relies on the success of hatching eggs, making it imperative to identify the most efficient and sustainable sanitization methods for this crucial stage of production (Zeweil et al., 2015; Clímaco et al., 2018). Considering the above, the objective of this study was to evaluate the potential of ozone as a sanitizer compared to commercial sanitizers for hatching eggs stored in hatching machines using different turning systems.

Material and methods

This study was conducted in the Poultry Sector, College of Agrarian Sciences, Federal University of Amazonas, Manaus (State of Amazonas), Brazil. The experimental procedures were approved by the Ethics Committee in Use of Animals of Federal University of Amazonas, Manaus, State of Amazonas, Brazil. Standard size eggs were obtained from Rhode Island Red breeders (n = 64; 62 wks-of-age; average body weight of 2.05±0.12) housed in an aviary with a density of 1 bird per m², feeding 115 g bird^-1 day^-1 of balanced diets (requirements according to Rostagno et al., 2017) and water ad libitum. Breeders presented previous attested fertility.

The eggs (n = 120; 52.15±2.52) were distributed using a completely randomized design in a factorial arrangement (6x2) where the treatments were constituted by different sanitizers applied (non-treated eggs, ozonated water at a concentration of 1.6 mg L^-1, ozonated water at a concentration of 3.2 mg L^-1, Cyphenothrin, UVC, and paraformaldehyde) and two turning systems in the hatching machine (vertical egg turning and horizontal egg turning) with 10 eggs each, with the egg considered as a replicate. All treated eggs were exposed for 60 min. to their respective sanitizer. Ozonated water, Cyphenothrin, and paraformaldehyde were applied using fumigation (Rui et al., 2011; Clímaco et al., 2018). Ozonated water was produced using an ozone generator model OP 22 (Interozone^©, Brazil), adjusted according to the proposed concentrations of ozone in the water (1.6 and 3.2 mg L^-1) (Braun et al., 2011; Miller et al., 2013; Nakamura et al., 2017). Cyphenothrin (currently used in the hatchery) was activated through a chemical reaction by combustion to carry out the fumigation process (Oliveira et al., 2020b). Paraformaldehyde was used for sanitization at a concentration of 6 g m^-3 (Nielsen & Wolkoff, 2010). Product burning, fumigation, and gas exhaust occurred in a hermetically sealed chamber. The relative humidity and temperature in the chamber were maintained at 70% and 30°C, respectively. UVC light disinfection was performed using a laminar flow cabinet - ESCO^® Optimair (Hatboro, Pennsylvania, USA) with a UVC lamp with a wavelength of 254 nm positioned above the eggs at a distance of 50 cm (Branco, Dallago, & Bernal, 2021).

After sanitizer treatments' application at room temperature, the eggs from each treatment were separated into two groups. One group (n = 60) was stored in a hatching machine (Barbaresco & Prado^©, Brazil) with 2 months old, a capacity for 200 eggs, and a vertical turning system. The other group (n = 60) was stored in a hatching machine (Galinha Choca^©, Brazil) with 6 years old, a capacity for 200 eggs, and a horizontal turning system. From 1 to 17 days of the incubation period, the relative humidity and temperature of each hatching machine were set at 65% and 37.5°C, respectively. From 18 to 21 days of the incubation period, the relative humidity and temperature of each hatching machine were adjusted to 75% and 36.5°C, respectively. Every 7 days, the eggs were removed from the hatching machine and subjected to an ovoscopy procedure, which lasted a short period (< 30 min.), to analyze the presence of embryonic mortality and to record the corresponding period of this mortality.

Immediately post-hatch, all hatched chicks were counted to calculate the hatching rate (hatched chicks per eggs incubated multiplied by 100). The non-hatched eggs were opened to evaluate the embryonic mortality stage, being classified as intermediary embryonic mortality (dead embryos between 8 and 14 days of incubation) and late embryonic mortality (dead embryos between 15 and 21 days of incubation with no pecking in the eggshell). Hatched chicks from each treatment were weighed. Chicks’ weight data were related to their respective eggs’ weight to calculate the chick/egg ratio.

Before performing data statistical analysis, all data were tested for normality and transformed if necessary. All data were analyzed by one-way ANOVA using the R software (version 4.1.3). All commands were performed according to Logan (2010). Tukey’s honestly significant difference test was used to test the significant differences among the mean values and compare the efficiency of ozone as a sanitizer in relation to commercial sanitizers for hatching eggs stored in hatching machines using different turning systems. The results are presented as means, and the significance level for differences was set at p < 0.05.

Results and discussion

In the results obtained in this study (as presented in Table 1), we observed remarkably similar performance in the incubation yields of hatching machines utilizing different turning systems, with significant differences noted only in hatching percentages, where hatching machines employing vertical turning demonstrated a slightly superior outcome (p < 0.05). Nonetheless, the observed difference was minimal, less than 10%. This suggests that even in a relatively small proportion, the direction of egg turning in the hatching machine can indeed exert an influence on the hatching percentage of the eggs, in alignment with the findings of Yadav et al. (2021).

Table 1
Incubation yields of eggs from older breeders treated using ozone compared to commercial sanitizers and stored into hatching machines using different turning systems.

Factors1	Variables2
	HT, %	IEM, %	LEM, %	CW, g	CER
TS
Horizontal	31.66b	16.67	83.33	45.20	0.75
Vertical	38.33a	16.67	83.33	45.02	0.75
ST
Non-treated	25.00c	75.00a	25.00c	41.41b	0.69bc
Ozone 1.6 mg L-1	35.00b	25.00b	75.00b	47.16b	0.78b
Ozone 3.2 mg L-1	40.00ab	0.00c	100.00a	38.62c	0.64c
Cyphenothrin	20.00c	0.00c	100.00a	57.00a	0.95a
UVC	45.00a	0.00c	100.00a	43.50b	0.72b
Paraformaldehyde	45.00a	0.00c	100.00a	43.00b	0.71b
Effect	p-value
TS3	0.05*	0.76ns	0.76ns	0.25ns	0.24ns
ST4	0.01*	0.01*	0.01*	0.01*	0.01*
TS x ST5	0.05*	0.36ns	0.36ns	0.02*	0.02*
CV6, %	13.93	22.84	15.68	18.28	18.22

• ¹TS - Turning systems. ST - Sanitizer treatment. ²HT - Hatching. IEM - Intermediary Embryonic Mortality. LEM - Late Embryonic Mortality. CW - Chick Weight. CER - Chick-Egg Relation. ³Averages followed by lowercase letters in the column demonstrate a significant effect of TS on the variables analyzed by Tukey's test at 0.05 significance. ns - not significant. ⁴Averages followed by lowercase letters in the column demonstrate a significant effect of ST on the variables analyzed by Tukey's test at 0.05 significance. ⁵p-value above 0.05 demonstrates a direct influence of one factor on the result of the other and vice versa. ns - not significant. ⁶CV - Coefficient of variation.

Understanding the implications of this subtle difference in hatching percentages can have practical implications for hatcheries aiming to maximize their yield (Tona, Onagbesan, Bruggeman, Mertens, & Decuypere, 2005; Elibol & Braket, 2006; Boleli, Morita, Matos Jr, Thimotheo, & Almeida, 2016). While the influence of turning systems on hatching performance might not be considerable, the accumulated effect over a large-scale hatchery operation can be of economic significance (Tona et al., 2005; Oliveira et al., 2020b). It underscores the importance of fine-tuning incubation processes to achieve the highest possible hatch rates. Further research into the underlying mechanisms behind this phenomenon, as well as the potential for more sophisticated turning systems, could offer valuable insights into optimizing hatchery operations and ensuring consistent, high-quality chick production (Ramli, Lim, Wahab, & Zin, 2015; Oliveira et al., 2020b).

Comparing the effectiveness of ozone to other sanitizers applied (Table 2), it becomes evident that both paraformaldehyde and UVC treatments significantly outperformed (p < 0.05) in terms of hatching percentages. Nevertheless, it is noteworthy that both concentrations of ozone used also yielded commendable hatching percentage results. Conversely, Cyphenothrin and non-treated eggs displayed notably lower hatching percentages, underscoring the efficacy of the sanitization methods employed.

In the context of the interaction between the factors influencing hatching percentage outcomes (Table 2), the previously observed patterns are reaffirmed, with the most favorable (p < 0.05) hatching percentages occurring in eggs treated with paraformaldehyde and UVC and stored in hatching machines utilizing a vertical turning system. Intriguingly, eggs subjected to ozone treatment exhibited higher (p < 0.05) hatching percentages when stored in hatching machines with a horizontal turning system. These findings shed light on the multifaceted relationship between sanitization methods, turning systems, and their combined impact on hatching performance, emphasizing the need for tailored approaches to maximize hatch rates and optimize poultry production (Rui et al., 2011; Clímaco et al., 2018). Further investigation into the specific mechanisms underlying these trends could offer valuable insights for hatchery management and egg hatchability enhancement (Rui et al., 2011; Clímaco et al., 2018; Oliveira et al., 2020a; 2020b).

The hatching percentage results observed in this study, while notably lower compared to the ideal percentages recommended by the literature (Araújo et al., 2016; Boleli et al., 2016; Silva, Pereira, Salgado, Ramos, & Freitas, 2017; Oliveira et al., 2020b), can be attributed to the relatively advanced age of the breeders used to produce the eggs examined. It is well-established that the reproductive system of breeders experiences a natural wear and decline in performance as they age, which subsequently leads to the development of more fragile embryos as they approach the latter stages of their productive period, typically occurring around 70 to 80 weeks of age, as corroborated by the findings of Francisco et al. (2012), Araújo et al. (2016) and Silva et al. (2017). Understanding the influence of breeder age on hatching outcomes is vital in realistic production settings, where variations in breeder age and reproductive performance can have a considerable impact on overall hatchability rates (Ramli et al., 2015; Araújo et al., 2016; Silva et al., 2017). Further research to delineate the interplay of breeder age, egg quality, and hatchability is essential for optimizing poultry production and ensuring consistent hatching success (Ramli et al., 2015; Araújo et al., 2016; Silva et al., 2017; Clímaco et al., 2018; Oliveira et al., 2020b).

The fact of paraformaldehyde has presented better results are according to the literature, where paraformaldehyde is commonly pointed out as the main used chemical in egg disinfection protocols worldwide (Branco et al., 2021) justly due to its ability to control salmonellosis (Gradel, Jørgensen, Andersen, & Corry, 2004) and other bacteria (Keïta et al., 2016) which, consequently, provide better incubation performance (Ladeira et al., 2012; Yadav et al., 2021). However, the regulation of paraformaldehyde is the subject of much discussions, especially due to its application has been related to the carcinogenesis of nasopharyngeal areas, brain, pancreas, and blood (Cadirci, 2009; Nielsen & Wolkoff, 2010).

Table 2
Interaction between the hatching machine turning systems (TS) and sanitizer treatments (ST) on the hatching results of eggs from older breeders.

Factors	TS2
ST1	Horizontal	Vertical
Non-treated	20.00Cb	30.00Ba
Ozone 1.6 mg L-1	40.00Ba	30.00Bb
Ozone 3.2 mg L-1	50.00Aa	30.00Bb
Cyphenothrin	20.00Ca	20.00Ca
UVC	30.00Bb	60.00Aa
Paraformaldehyde	30.00Bb	60.00Aa

• ¹Means followed by capital letters (columns) show a significant difference (p < 0.05) between the different ST. ²Means followed by lowercase letters (lines) show a significant difference (p < 0.05) between the different TS.

The UV light has disappointed as a good alternative to paraformaldehyde replacement in recent decades (Gottselig, Dunn-Horrocks, Woodring, Coufal, & Duong, 2016), presenting results proximal to the paraformaldehyde application (Maclean, McKenzie, Anderson, Gettinby, & MacGregor, 2014; Gottselig et al., 2016), such as observed in this study. However, disinfection protocols using UV are not standardized and there are some unclear questions in its use as the exposing time, efficiency and the impact on hatching, embryonic mortality and birth distribution (Branco et al., 2021). The low efficiency of Cyphenothrin in hatching percentage results may be associated to the fact that it is only an insecticide/pesticide (Mendis, Tennakoon, & Jayasinghe, 2018; Leong et al., 2020; Boukouvala & Kavallieratos, 2020), with no real effect on the microbiota that commonly cause problems to hatch eggs, which is basically of bacterial origin (Kizerwetter-Świda & Binek, 2008; Hameed, Akram, & Anjum, 2014; Clímaco et al., 2018; Nogueira et al., 2019). Therefore, their effect is minimal or none to avoid their action on the embryos.

The good results presented by ozone-treated eggs, which were very close to eggs treated using paraformaldehyde and UVC, confirm the sanitizing potential of this technology, a point very reported in literature (Miller et al., 2013; Yüceer et al., 2016; Nakamura et al., 2017; Pandiselvam et al. 2017; Pandiselvam et al., 2019), in addition to propose another possible application of this technology. According to Karaca (2010) and Pandiselvam et al. (2019), due to its good results in several scenarios as sanitizer and ecologically correct approach (without residues), ozone technology is gradually replacing conventional sanitation and fumigation techniques including chlorine, steam or hot water, and pesticides (fumigation) like phosphine, aluminum phosphide, and methyl bromide. Moreover, a number of commercial food preservation industries have started using ozone technology.

In the results of embryonic mortality (Table 1), there was embryonic mortality only in the non-treated eggs and eggs treated with the minimal ozone concentration (1.6 mg L^-1), indicating that the minimum treatment of eggs can be sufficient to avoid (p < 0.05) embryonic mortality up to 14 days of incubation, regardless of the turning system used in the hatching machine. On the other hand, most of the embryonic mortality occurred in this study was concentrated (p < 0.05) in the final stage of the incubation period (late mortality). In addition to a possible effect of treatments, this mortality concentrated at this stage may be related to the advanced age of breeders used, which according to literature (Francisco et al., 2012; Araújo et al., 2016; Nowaczewski, Babuszkiewicz, & Kaczmrek, 2016; Silva et al., 2017) tends to weaken embryos in the final stage of the incubation period and, consequently, cause a considerably raise in the embryonic mortality at this period.

In examining the results related to the hatchlings (as summarized in Table 1), a noticeable trend emerged where chicks from treated eggs, with the exception of those subjected to the highest ozone concentration (3.2 mg L^-1), exhibited significantly higher hatch weights (p < 0.05). These findings align with the insights of Araújo and Albino (2011), Kusstatscher et al. (2017), and Oliveira et al. (2020a), who emphasize that even subtle and appropriately balanced pre-incubation treatments can substantially contribute to a cleaner and more hygienic environment for embryo development, thereby manifesting in superior hatchling outcomes. This underscores the crucial role of pre-incubation sanitation practices in optimizing hatchling quality and growth. Further research may delve into the specific mechanisms and parameters that influence these effects, allowing for the refinement of egg treatment strategies and their implications for overall poultry production efficiency and the poultry industry as a whole.

In the interaction between the factors affecting chick weight results (as outlined in Table 3), notable patterns emerge, highlighting the efficacy of low-concentration ozone treatment (1.6 mg L^-1). Chicks hatched from eggs treated with this ozone concentration consistently displayed higher hatch weights compared to chicks from eggs treated with commonly used sanitizers, particularly Paraformaldehyde and UVC (p < 0.05). These findings further underscore the potential of ozone in creating an environment conducive to optimal embryo development during their incubation period in the hatching machine (Yüceer et al., 2015; Nakamura et al., 2017; Pandiselvam et al., 2017; Pandiselvam et al., 2019). The observed positive impact on hatch weight speaks to the significance of environmental factors on chick development and hatchery outcomes. These insights may have practical implications for hatchery management and strategies aimed at enhancing the overall quality and growth potential of hatched chicks (Rui et al., 2011; Sgavioli et al., 2016; Clímaco et al., 2018; Oliveira et al., 2020a; 2020b). Further research is warranted to delve deeper into the underlying mechanisms behind these effects and to explore potential strategies for maximizing chick weight and overall poultry production efficiency.

Table 3
Interaction between the hatching machine turning systems (TS) and sanitizer treatments (ST) on the chick weight (CW) and chick-egg relation (CER) results of chick from older breeders.

CW
Factors	TS2
ST1	Horizontal	Vertical
Non-treated	38.50Cb	44.30Ba
Ozone 1.6 mg L-1	43.00Bb	51.33Aa
Ozone 3.2 mg L-1	41.75Ba	35.50Cb
Cyphenothrin	56.50Ab	57.50Aa
UVC	51.75Aa	35.25Cb
Paraformaldehyde	39.75Cb	46.25Ba
CPO
Factors	TS2
ST1	Horizontal	Vertical
Non-treated	0.64Cb	0.74Ba
Ozone 1.6 mg L-1	0.71BCb	0.86Ba
Ozone 3.2 mg L-1	0.70BCa	0.59Cb
Cyphenothrin	0.94Ab	0.96Aa
UVC	0.86Ba	0.58Cb
Paraformaldehyde	0.66Cb	0.77Ba

• ¹Means followed by capital letters (columns) show a significant difference (p < 0.05) between the different ST. ²Means followed by lowercase letters (lines) show a significant difference (p < 0.05) between the different TS.

Conclusion

In conclusion, this study highlights the potential of ozone as an effective egg sanitizer, particularly in the context of eggs from older breeders. Ozone shows promise as a replacement for common sanitizers like paraformaldehyde and UVC, irrespective of the hatching machine's turning system. It consistently yielded favorable outcomes, enhancing hatching percentages and chick weights at hatch. This underscores ozone's role in improving hatchery efficiency and chick quality, indicating its relevance for more efficient poultry production practices.

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Publication Dates

• Publication in this collection
  28 Oct 2024
• Date of issue
  2024

History

• Received
  01 Oct 2022
• Accepted
  12 Jan 2024