Guava Leaf Extract Boosts Growth, Nutrition, and Immunity in Young Rabbits

Jenn Hoskins
4th October, 2024

Guava Leaf Extract Boosts Growth, Nutrition, and Immunity in Young Rabbits
Image Source: Ray Bilcliff (photographer)

Key Findings

  • The study at Zagazig University found that adding guava leaf extract (GLE) to rabbit diets significantly improved their growth and feed efficiency
  • Rabbits fed with GLE had lower levels of harmful lipids and liver enzymes, indicating better liver function and reduced stress
  • GLE supplementation enhanced the rabbits' immune function and antioxidant capacity, reducing oxidative stress markers
The use of agricultural waste in animal production has garnered significant global interest. A recent study conducted by Zagazig University investigated the effects of adding ethanolic guava leaf extract (GLE) as a feed supplement on the growth, feed utilization, immune response, nutrient digestibility, redox regulation, and blood health of growing rabbits[1]. This eight-week trial involved ninety weaned growing rabbits, divided into three groups: one fed a basal diet (GLE0), and the other two fed the control diet fortified with either 15 mg (GLE15) or 20 mg (GLE20) of GLE per kg of diet. The study revealed several important findings. Rabbits that received GLE supplements showed significantly higher final body weight, daily body weight gain, daily feed intake, and nutrient digestibility compared to the untreated group (p < 0.05). These results suggest that GLE can enhance growth performance and feed efficiency in rabbits. In terms of lipid metabolism, dietary supplementation with GLE significantly reduced lipid contents, including triglycerides, total cholesterol, LDL, HDL, and VLDL, with the most significant results observed in the GLE20 group (P < 0.05). Additionally, levels of AST and ALT (liver enzymes) as well as cortisol (a stress hormone) were lower in rabbits fed GLE compared to those in the GLE0 group (P < 0.05). This indicates that GLE may improve liver function and reduce stress in rabbits. Furthermore, the study found that immunoglobulins (IgG and IgA), antioxidant biomarkers (SOD and TAC), and T3 hormone levels were significantly improved by GLE supplementation (P < 0.001). Rabbits fed with GLE also had lower levels of reactive oxygen species (ROS) and malondialdehyde (MDA), markers of oxidative stress, compared to those in the GLE0 group (P < 0.001). These findings suggest that GLE can enhance immune function and antioxidant capacity in rabbits. The study's results align with previous research that has explored the use of various supplements to combat heat stress and improve rabbit health. For instance, adding pumpkin seed oil to rabbit diets has been shown to promote growth and improve antioxidant and immunological status under heat stress conditions[2]. Similarly, herbal supplements like Moringa, Phyllanthus, and mistletoe have been found to suppress pro-inflammatory cytokines, boost humoral immunity, and enhance the anti-oxidative status of rabbits during thermal discomfort[3]. The study also supports findings that dietary interventions can reduce oxidative stress. Previous research has shown that fasting can reduce ROS generation and oxidative damage to amino acids[4]. The current study extends these findings by demonstrating that GLE supplementation can similarly reduce oxidative stress in rabbits, as evidenced by lower levels of ROS and MDA. In conclusion, the study conducted by Zagazig University demonstrates that GLE supplementation in rabbit diets can efficiently improve growth, health status, blood physiology, antioxidant capacity, and tissue histology. These findings suggest that GLE could be a valuable feed supplement for enhancing rabbit production and health, particularly in environments where heat stress and oxidative damage are concerns.

NutritionHealthAnimal Science

References

Main Study

1) Dietary supplement guava leaf extract regulates growth, feed utilization, immune function, nutrient digestibility and redox regulation in growing rabbits.

Published 3rd October, 2024

https://doi.org/10.1007/s11250-024-04126-4

Related Studies

2) Pumpkin seed oil-supplemented diets promoted the growth productivity, antioxidative capacity, and immune response in heat-stressed growing rabbits.

https://doi.org/10.1007/s11250-023-03460-3

3) Herbal supplements suppress pro-inflammatory cytokines, boost humoral immunity, and modulate adipokines to enhance the productivity traits of rabbit bucks in hot climatic conditions.

https://doi.org/10.1007/s11250-023-03640-1

4) Inhibitory effect of a two day fast on reactive oxygen species (ROS) generation by leucocytes and plasma ortho-tyrosine and meta-tyrosine concentrations.

Journal: The Journal of clinical endocrinology and metabolism, Issue: Vol 86, Issue 6, Jun 2001


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