"I don't do anything else, I just farm. I love it.
"Sometimes you get a little too attached to them and don't want them to leave the farm when they are sold."
On average, calf rearers stayed in the business for about four years.
"A lot can go wrong rearing calves because it is high risk, and it can be uneconomic if you can't buy 4-day-old calves at a reasonable price.
"The key is to buy young good quality calves and sell them for a profit at 100kg to a contract buyer with a guaranteed price."
Mrs Hosking said most dairy farmers were keen to sell to rearers at a reasonable price - that way both of parties benefited. "This year 90,000 more calves than usual were killed - this meant rearers didn't rear the calves, and dairy farmers didn't get a premium price selling to them.
"The result is that there will be a shortage of dairy beef calves this summer which causes a problem for dairy farmers wanting to buy these calves to fatten."
It is not until calves reach 9-12 months and develop resistance to worms that a calf rearer "can relax a little".
Up until then, it is a constant daily vigil to monitor the calves' growth and disease resistance.
Tube-feeding colostrum is essential in the first days to build protection as young calves can get sick quickly and have little immunity to diseases, such as salmonella or rotavirus, which can spread rapidly through the shed without warning.
Mrs Hosking is vigilant about protecting her calves - this year she has reared 120 - from disease and will often have them off limits to visitors.
"I also take the precaution at buying my calves from dairy farmers I know and can trust."
Her purpose-built calf rearing shed accommodates 10-15 calves in each pen for the first six weeks, or until they reach 65kg, and are turned out to pasture.
The pens have warm dry shavings, clean water and access to fresh pellets.
"I feed them high-quality milk powder, always feeding them the right amounts at the right time," she said.
From six weeks old to the time the calves reach 100kg, they are fed pellets until they are able to survive on grass alone.
Regular drenching helped control worms, coccidiosis, eczema and copper deficiency.