Today, the farm produces 25 million litres of milk a year.

Family owned and operated, it began with Kolombo and Julia Perich after they migrated from Croatia.

Their two sons, Tony and Ron, helped develop the business to what it is today.

Leppington Pastoral Company moved to Bringelly in late 1958 on 242 hectares. From 1964, 1000 cows were being milked on a 40-stand rotary and the farm became 600 hectares when more land was acquired.

In the early '90s, the federal government compulsorily bought 40 hectares for the proposed Badgerys Creek airport.

The owners have not been able to buy the land back off the government.

Michael Perich, son of Ron and a third generation dairy farmer, is now managing the farm.

Growing up on the property on which he has lived all his life, Mr Perich said he remembers returning home after school to feed the calves and milk the cows.

The cattle are artificially inseminated and hand-bred from when they are born.

Mr Perich said the number one priority of the farm was the comfort of each cow.

They each have their own bed to lie in, filled with sand, and also have their own tailor-made nutrition plan.

"A happy cow produces milk," Mr Perich said.

The cows are milked three times a day, producing about 37 litres each.

Seventy-two cows can be milked at one time.

The calves also have their own area in the farm with about eight born each day.

"Cows are actually very smart," Mr Perich said. "A lot of people think they're dumb but they're not."

The milk produced by the cows is mainly allocated to a milk company called A2.

A2 recently announced it would be building a dairy factory in Smeaton Grange. Mr Perich said this would strengthen the business partnership.

The farm has 35 employees and Mr Perich said a lot of the staff live on site.

Leppington Pastoral Company also owns 10,000 hectares of land at west Wyalong which is used for rearing stock and growing various grains.

It is involved in a number of developments in the area, including Oran Park and Narellan Town Centre.

Tell us about your farm stories. Email reporter Shery Demian, sdemian@fairfaxmedia.com.au