Skip to main content
Research article - Peer-reviewed, 2021

Non-enzymatic extraction of spermatozoa from alpaca ejaculates by pipetting followed by colloid centrifugation

Morrell, Jane M.; Warring, Sofia Karlsson; Norrestam, Emma; Malo, Clara; Huanca, Wilfredo;

Abstract

Viscous camelid ejaculates present problems for sperm handling and sperm preservation. In the present study, a technique that had been used for dromedary camel semen was tested with alpaca semen. Ejaculates (n=9) were collected by artificial vagina at San Marcos University, Lima, and were liquefied by gentle pipetting in triscitrate-fructose. Half of the sample was prepared by Single Layer Centrifugation (SLC) through a colloid; the other half was centrifuged without colloid as a control. Each control and SLC sample was then split into two parts; one part was stored cooled for 24 h at 5 degrees C and the other part was frozen, resulting in 4 treatments for each ejaculate. All samples were evaluated for sperm motility, hypoosmotic swelling test (HOST), plasma membrane integrity, and morphology, immediately after centrifugation and again after storage Total motility and plasma membrane integrity were greater in samples prepared by SLC than controls (motility 72 +/- 13% vs. 57 +/- 7%; plasma membrane integrity 63 +/- 13% vs. 54 +/- 8%, for SLC and controls respectively). Normal morphology and HOST were not different between treatments (65 +/- 13 vs. 61 +/- 13% and 42 +/- 6 vs. 39 +/- 10%, for SLC and controls respectively). After 24 h cooled storage, motility and plasma membrane integrity were greater for SLC samples (motility: 51 +/- 16 vs. 34 +/- 15%; p<0.001; membrane integrity: 51 +/- 15 vs. 40 +/- 18%; P < 0.05 for SLC and controls, respectively); HOST (40 +/- 14 vs. 34 +/- 11%) and normal morphology (67 +/- 13 vs. 63 +/- 14%) were not different between treatments. Sperm quality decreased considerably after cryopreservation (P<0.001 for all parameters); however, motility (P<0.01), plasma membrane integrity (P<0.05) and morphology (P<0.05) were higher for SLC than for controls. These results indicate that alpaca spermatozoa can be extracted from semen using a combination of pipetting and SLC, potentially with a beneficial effect on sperm quality. Samples could be stored cooled for 24 h, retaining better motility than controls; motility and plasma membrane integrity were greater in SLC samples than controls after freezing and thawing but the freezing protocol requires improvement.

Keywords

Silane silica-coated nanoparticles; South American camelids; Artificial insemination; Sperm quality; Sperm freezing

Published in

Livestock Science

2021, volume: 251, article number: 104627
Publisher: ELSEVIER

Authors' information

Swedish University of Agricultural Sciences, Department of Clinical Sciences
Karlsson Warring, Sofia
No organisation
Norrestam, Emma
No organisation
Malo, Clara
Camel Reproduction Center
Huanca, Wilfredo
Universidad Nacional Mayor de San Marcos

UKÄ Subject classification

Clinical Science

Publication Identifiers

DOI: https://doi.org/10.1016/j.livsci.2021.104627

URI (permanent link to this page)

https://res.slu.se/id/publ/113484