Young Blonde Girl In The Hay With The Orange Scarf

Large bales
Many farmers, particularly those who feed large herds, have moved to balers which produce much larger bales, maximizing the amount hay which is protected from the elements. Large bales come in two types, round and square. "Large Square" bales, which can weigh up to 1000 kg (2,200 lb), can be stacked and are easier to transport on trucks. Round bales, which are typically weigh 300–400 kg (700–900 lb), are more moisture-resistant, and pack the hay more densely (especially at the center). Round bales are quickly fed with the use mechanized equipment.
The ratio volume to surface area makes it possible for many dry-area farmers to leave large bales outside until they are consumed. Wet-area farmers and those in climates with heavy snowfall either stack round bales under a shed or tarp, but have also developed a light but durable plastic wrap that partially encloses bales left outside. The wrap repels moisture, but leaves the ends the bale exposed so that the hay itself can "breathe" and does not begin to ferment. However, when possible to store round bales under a shed, they last longer and less hay is lost to rot and moisture.