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<p>This study investigated the effects of male-to-female ratios and two different types of feed on the reproductive performance of the Madagascar hissing cockroach, <i>Gromphadorhina portentosa</i>. Utilizing a 2 × 2 factorial design, we evaluated two male-to-female ratios (1:2 and 1:3) and two types of commercial feed (dog food and rodent food), with five replicates per treatment. Key parameters such as feed intake, feces production, breeder mortality, nymph output, and non-viable egg expulsion rates were assessed weekly over a six-month period. Our findings indicate, although the cockroaches consumed significantly more dog food than rodent food (<i>p</i> &lt; 0.05), this higher intake did not result into a statistically significant increase in nymph production. Furthermore, no significant differences were observed in nymph output, non-viable egg expulsion rates, or breeder mortality across treatments. Interestingly, the 1:2 male-to-female ratio, despite not being statistically significant, exhibited a tendency towards higher nymph production (37.80&#xa0;nymphs/female) compared to the 1:3 ratio (18.30&#xa0;nymphs/female). These results suggest that neither feed type nor sex ratio, within the tested parameters, profoundly influences the overall reproductive performance of <i>Gromphadorhina portentosa</i>. However, the observed trend in the 1:2 ratio suggests potential was to optimise breeding efficiency, and provides valuable insights for insect farming practices and future research into sustainable protein sources.</p>

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Effects of the male–female ratio and feed type on the reproductive performance of Madagascar cockroach (Gromphadorhina portentosa)

  • 期刊论文

  • 发表日期：

    2026年3月22日

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  • Lucas Gabryel Maciel dos Santos,
  • Marcos Eli Buzanskas,
  • Fabio Iared,
  • Cristina Moreira Bonafé,
  • Jeanne Broch Siqueira,
  • Thiago Vasconcelos Melo

摘要

This study investigated the effects of male-to-female ratios and two different types of feed on the reproductive performance of the Madagascar hissing cockroach, Gromphadorhina portentosa. Utilizing a 2 × 2 factorial design, we evaluated two male-to-female ratios (1:2 and 1:3) and two types of commercial feed (dog food and rodent food), with five replicates per treatment. Key parameters such as feed intake, feces production, breeder mortality, nymph output, and non-viable egg expulsion rates were assessed weekly over a six-month period. Our findings indicate, although the cockroaches consumed significantly more dog food than rodent food (p < 0.05), this higher intake did not result into a statistically significant increase in nymph production. Furthermore, no significant differences were observed in nymph output, non-viable egg expulsion rates, or breeder mortality across treatments. Interestingly, the 1:2 male-to-female ratio, despite not being statistically significant, exhibited a tendency towards higher nymph production (37.80 nymphs/female) compared to the 1:3 ratio (18.30 nymphs/female). These results suggest that neither feed type nor sex ratio, within the tested parameters, profoundly influences the overall reproductive performance of Gromphadorhina portentosa. However, the observed trend in the 1:2 ratio suggests potential was to optimise breeding efficiency, and provides valuable insights for insect farming practices and future research into sustainable protein sources.