Advances in Boar Semen Cryopreservation

<table>Cryo-Scanning Electron microscopy (Cryo-SEM) micrographs of boar semen conventionally frozen in Flat-Pack, showing the frozen extender (arrows), containing spermatozoa (spz and small arrows) and the areas of frozen free water (<svg height="11.6875" id="M4" style="vertical-align:-0.12538pt" version="1.1" viewbox="0 0 57.775002 11.6875" width="57.775002" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,11.6875)">
<g transform="translate(72,-62.65)">
<text transform="matrix(1,0,0,-1,-71.95,67.83)">
<tspan style="font-size: 8.75px; " x="0" y="0">∗</tspan>
</text>
<text transform="matrix(1,0,0,-1,-63.4,62.83)">
<tspan style="font-size: 12.50px; " x="0" y="0">=</tspan>
<tspan style="font-size: 12.50px; " x="12.027886" y="0">l</tspan>
<tspan style="font-size: 12.50px; " x="15.50372" y="0">a</tspan>
<tspan style="font-size: 12.50px; " x="21.055052" y="0">k</tspan>
<tspan style="font-size: 12.50px; " x="27.156515" y="0">e</tspan>
<tspan style="font-size: 12.50px; " x="32.707848" y="0">s</tspan>
</text>
</g>
</g>
</svg>), Bars: (a) 10 <svg height="9.6750002" id="M5" style="vertical-align:-2.29482pt" version="1.1" viewbox="0 0 9.6374998 9.6750002" width="9.6374998" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,9.675)">
<g transform="translate(72,-64.26)">
<text transform="matrix(1,0,0,-1,-71.95,66.6)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝜇</tspan>
</text>
</g>
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</svg>m, (b)1 <svg height="9.6750002" id="M6" style="vertical-align:-2.29482pt" version="1.1" viewbox="0 0 9.6374998 9.6750002" width="9.6374998" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,9.675)">
<g transform="translate(72,-64.26)">
<text transform="matrix(1,0,0,-1,-71.95,66.6)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝜇</tspan>
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</svg>m (Photo: H Ekwall, Uppsala).</table>

Veterinary Medicine International

Advances in Boar Semen Cryopreservation

Figure 1