The effect of Bulgarian product Vemoherb-T (dry extract of Tribulus terrestris) on some characteristics of the reproductive capacity of Guinea fowl (Numida meleagris) was studied. A trial was conducted with 30 Pearl-gray Guinea fowls, at the age of 32 weeks, divided in two groups, 12 female and 3 male each. The birds from the two groups were fed the same mixture. The experimental group received the tested product once daily in a dose 10 mg/kg body weight for 12 weeks. The laying intensity, egg morphology and fertility, the weight of testes and ovaries were controlled. It was found a higher laying intensity (P<0.05), similarly higher egg weight (P<0.001), yolk weight (P<0.01), left testes weight (P<0.05) and egg fertility in the experimental group. No significant differences about egg white weight and yolk color between the both groups were found.
This experiment was designed to evaluate the effect of different doses of Bulgarian product Vemoherb-T (dry extract of Tribulus terrestris) on egg production, serum level of testosterone and histological structure of gonads and kidneys in Japanese quail. In the experiment a total of 52 female and 16 male Japanese quail from Pharaon breed at the initial age of 44 days were involved. Quails were randomly divided in control and three experimental groups, 13 female and 4 male in each. Experimental groups received with the drink water the tested product in following daily doses: 4 mg/kg body weight (10 weeks); 10 mg/kg body weight (the first 5 weeks of the trial); 10 mg/kg body weight (10 weeks) for I st , II nd , III rd treated groups respectively. A significant increase of ovary weight in quails from III rd experimental group (P < 0.01) in comparison with the control was measured. Egg production in II nd and III rd treated groups increased significantly (P < 0.01) than the control group. Testosterone level of males from III rd experimental group enhanced significantly (P < 0.05; P < 0.01) than other groups. The ovary core part of females from III rd experimental group contained a much lower number of mature follicles in comparison to the other groups and its central medulla was highly vascularized. Tribulus terrestris extract in a dose of 10 mg/kg stimulates the production of male reproductive cells, while the dose of 4 mg/kg caused a delay of spermatozoa production. Histological analysis showed that in all experimental groups the structure of the kidneys was preserved and that the higher doses lead to certain reduction of the parenchyma.
A comparative study of the effect of the Bulgarian product Vemo Herb (dry extract of Tribulus terrestris) produced on the histological structure of liver in Guinea fowl (Numida meleagris) and Japanese quail (Coturnix coturnix japonica) was carried out with 2 groups (control and experimental) from both poultry species: 15 Pearl-gray Guinea fowls (12 females and 3 males) per group, and 17 Japanese quails -Pharaon breed (13 females and 4 males) per group. The poultry in the experimental groups received 10 mg/kg body weight/day of the tested additive. The trial lasted 11 weeks (1 week of preparatory and 10 weeks of experimental period). It was found that VemoHerb-T in a daily dose of 10 mg•kg -1 body weight causes a high degree of liver fat dystrophy in male and female poultry from both species. There were no significant differences in the liver histological structure between males and females from both species. Significant effect of the additive is observed on body weight in both male and female Guinea fowls, weight of liver in both male and female Japanese quails and liver's histostructure of the two species -being higher in Japanese quails.
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