Coconut water-based extender for seminal preservation in small ruminants: a meta-analysis study

• Ano de defesa: 2021
• Autor(a) principal: Reis, Rogério Amorim dos
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Universidade Federal de Viçosa; Zootecnia
• Palavras-chave em Português: Ruminantes - Espermatozoides; Sêmen - Preservação; Água-de-coco; Sêmen - Qualidade; Estimativa de parâmetros; Reprodução Animal
• Link de acesso: https://locus.ufv.br//handle/123456789/29423; https://doi.org/10.47328/ufvbbt.2021.084

Semen extenders based on egg yolk and milk have been widely used in seminal preservation. However, they present health risks due to the transmission of pathogens. Therefore, new studies have emerged seeking for a diluent of vegetable origin, capable of guaranteeing sperm quality and eliminating the risk of contamination presented by that of animal origin. In light of the above, a meta-analytical review was conducted to determine the effect of coconut water as a seminal extender for small ruminants’ sperm preservation. Studies that met the inclusion criteria were retrieved from PubMed, Science Direct, Scopus, and Web of Science. According to the selection criteria of this study, 88 independent comparisons were obtained from the nine studies included in the meta-analysis. The weighted mean difference (WMD) between treatments with coconut water (diluents including coconut water) and control treatments (diluents without the addition of coconut water) was evaluated using the random-effects model of meta-analysis. Heterogeneity was explored by meta-regression and subgroup analysis, performed using as covariate: type of coconut water, types of control treatment to which coconut water was contrasted, type of preservation, preservation time, and animal species. The overall results showed that coconut water elicited a positive effect on the total motility of sperm cells from cooled semen (P < 0.05), while for the fresh and cryopreserved semen no significant effect was observed. In addition, coconut water showed a positive effect on membrane integrity of sperm cells from fresh semen (P < 0.05). On the other hand, for cooled semen, a negative result was found (P < 0.05). Therefore, the use of coconut water as a seminal extender proved to be a viable alternative for seminal preservation in small ruminants. Keywords: Coconut water. Extender. Sperm. Sperm quality.